Use built-in file explorer instead of OEM implementation

app/build.gradle

@@ -4,6 +4,7 @@ buildscript {
     }
 
     dependencies {
+        //noinspection GradleDynamicVersion
         classpath 'io.fabric.tools:gradle:1.+'
     }
 }
@@ -25,7 +26,7 @@ android {
         exclude 'META-INF/LICENSE'
         exclude 'META-INF/DEPENDENCIES'
     }
-    compileSdkVersion 26
+    compileSdkVersion 27
     buildToolsVersion "26.0.2"
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -34,9 +35,9 @@ android {
     defaultConfig {
         applicationId "com.wbrawner.simplemarkdown"
         minSdkVersion 19
-        targetSdkVersion 26
+        targetSdkVersion 27
-        versionCode 2
+        versionCode 3
-        versionName "0.1.1"
+        versionName "0.1.2"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -50,15 +51,19 @@ android {
     }
 }
 
+ext {
+    support_version = "27.0.2"
+}
+
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
-    compile 'com.android.support:appcompat-v7:26.0.0'
+    compile "com.android.support:appcompat-v7:$support_version"
     compile 'com.android.support.constraint:constraint-layout:1.0.2'
-    compile 'com.android.support:design:26.0.0'
+    compile "com.android.support:design:$support_version"
-    compile 'com.android.support:support-v13:26.0.0'
+    compile "com.android.support:support-v13:$support_version"
     compile 'com.commonsware.cwac:anddown:0.3.0'
     compile 'com.google.dagger:dagger:2.11'
     compile 'com.jakewharton:butterknife:8.7.0'
@@ -67,9 +72,12 @@ dependencies {
     compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
     compile 'io.reactivex.rxjava2:rxjava:2.1.0'
     testCompile 'junit:junit:4.12'
+    androidTestCompile 'com.android.support.test.espresso:espresso-core:3.0.1'
+    androidTestCompile 'com.android.support.test:runner:1.0.1'
+    androidTestCompile 'com.android.support.test.uiautomator:uiautomator-v18:2.1.3'
     annotationProcessor 'com.google.dagger:dagger-compiler:2.11'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.7.0'
     compile('com.crashlytics.sdk.android:crashlytics:2.8.0@aar') {
-        transitive = true;
+        transitive = true
     }
 }

app/src/androidTest/java/com/wbrawner/simplemarkdown/MainActivityTests.java

@@ -0,0 +1,71 @@
+package com.wbrawner.simplemarkdown;
+
+import android.content.Context;
+import android.content.pm.ActivityInfo;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.rule.ActivityTestRule;
+import android.support.test.runner.AndroidJUnit4;
+import android.support.test.uiautomator.UiDevice;
+import android.support.test.uiautomator.UiObject;
+import android.support.test.uiautomator.UiScrollable;
+import android.support.test.uiautomator.UiSelector;
+
+import com.wbrawner.simplemarkdown.view.activity.MainActivity;
+
+import org.junit.Before;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static android.support.test.InstrumentationRegistry.getInstrumentation;
+import static android.support.test.espresso.Espresso.onView;
+import static android.support.test.espresso.Espresso.openActionBarOverflowOrOptionsMenu;
+import static android.support.test.espresso.action.ViewActions.click;
+import static android.support.test.espresso.matcher.ViewMatchers.withText;
+import static org.junit.Assert.assertEquals;
+
+/**
+ * Instrumentation test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class MainActivityTests {
+
+    @Rule
+    public ActivityTestRule<MainActivity> mActivityRule =
+            new ActivityTestRule(MainActivity.class);
+
+    @Before
+    public void setup() {
+        mActivityRule.getActivity()
+                .setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
+    }
+
+    @Test
+    public void openAppTest() throws Exception {
+        UiDevice mDevice = UiDevice.getInstance(getInstrumentation());
+        mDevice.pressHome();
+        // Bring up the default launcher by searching for a UI component
+        // that matches the content description for the launcher button.
+        UiObject allAppsButton = mDevice
+                .findObject(new UiSelector().description("Apps"));
+
+        // Perform a click on the button to load the launcher.
+        allAppsButton.clickAndWaitForNewWindow();
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.wbrawner.simplemarkdown", appContext.getPackageName());
+        UiScrollable appView = new UiScrollable(new UiSelector().scrollable(true));
+        UiSelector simpleMarkdownSelector = new UiSelector().text("Simple Markdown");
+        appView.scrollIntoView(simpleMarkdownSelector);
+        mDevice.findObject(simpleMarkdownSelector).clickAndWaitForNewWindow();
+    }
+
+    @Test
+    public void openFileWithoutFilesTest() {
+        openActionBarOverflowOrOptionsMenu(InstrumentationRegistry.getTargetContext());
+        onView(withText("Open")).perform(click());
+    }
+}

app/src/main/AndroidManifest.xml

@@ -13,7 +13,8 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name=".view.activity.SplashActivity"
+        <activity
+            android:name=".view.activity.SplashActivity"
             android:theme="@style/AppTheme.Splash">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -37,7 +38,7 @@
                 <data android:host="*" />
             </intent-filter>
         </activity>
-        <activity android:name=".view.activity.MainActivity"></activity>
+        <activity android:name=".view.activity.MainActivity" />
 
         <provider
             android:name="android.support.v4.content.FileProvider"
@@ -54,6 +55,10 @@
                 android:name="android.support.PARENT_ACTIVITY"
                 android:value=".view.activity.MainActivity" />
         </activity>
+        <activity
+            android:name=".view.activity.ExplorerActivity"
+            android:label="@string/title_activity_explorer"
+            android:theme="@style/AppTheme.NoActionBar"></activity>
     </application>
 
 </manifest>

app/src/main/java/com/wbrawner/simplemarkdown/model/MarkdownFile.java

@@ -1,10 +1,7 @@
 package com.wbrawner.simplemarkdown.model;
 
-import android.util.Log;
-
 import java.io.BufferedReader;
 import java.io.File;
-import java.io.FileDescriptor;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.FileReader;
@@ -100,14 +97,16 @@ public class MarkdownFile {
     }
 
     public int load(String path) {
-        Log.d(TAG, path);
+        return load(new File(path));
+    }
+
+    public int load(File markdownFile) {
         int code;
-        File markdownFile = new File(path);
         if (markdownFile.exists() && markdownFile.canRead()) {
             BufferedReader reader = null;
             try {
                 this.name = markdownFile.getName();
-                this.path = markdownFile.getPath();
+                this.path = markdownFile.getParentFile().getAbsolutePath();
                 StringBuilder sb = new StringBuilder();
                 String line;
                 reader = new BufferedReader(new FileReader(markdownFile));
@@ -171,6 +170,8 @@ public class MarkdownFile {
         } else {
             code = WRITE_ERROR;
         }
+        this.name = markdownFile.getName();
+        this.path = markdownFile.getParentFile().getAbsolutePath();
         return code;
     }
 

app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.java

@@ -6,6 +6,7 @@ import android.net.Uri;
 import com.wbrawner.simplemarkdown.view.MarkdownEditView;
 import com.wbrawner.simplemarkdown.view.MarkdownPreviewView;
 
+import java.io.File;
 import java.io.InputStream;
 
 /**
@@ -13,8 +14,10 @@ import java.io.InputStream;
  */
 
 public interface MarkdownPresenter extends LifecyclePresenter {
+    File getFile();
     void loadMarkdown(String filePath);
     void loadMarkdown(InputStream in);
+    void loadMarkdown(File file);
     void loadFromUri(Context context, Uri fileUri);
     void loadTempMarkdown(InputStream in, OnTempFileLoadedListener listener);
     void setEditView(MarkdownEditView editView);

app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenterImpl.java

@@ -10,6 +10,7 @@ import com.wbrawner.simplemarkdown.model.MarkdownFile;
 import com.wbrawner.simplemarkdown.view.MarkdownEditView;
 import com.wbrawner.simplemarkdown.view.MarkdownPreviewView;
 
+import java.io.File;
 import java.io.InputStream;
 
 /**
@@ -41,8 +42,19 @@ public class MarkdownPresenterImpl implements MarkdownPresenter {
 
     @Override
     public void loadMarkdown(String filePath) {
+        File markdownFile = new File(filePath);
+        loadMarkdown(markdownFile);
+    }
+
+    @Override
+    public File getFile() {
+        return new File(file.getFullPath());
+    }
+
+    @Override
+    public void loadMarkdown(File file) {
         Runnable fileLoader = () -> {
-            int result = file.load(filePath);
+            int result = this.file.load(file);
             if (editView != null) {
                 if (result == MarkdownFile.SUCCESS) {
                     editView.setMarkdown(getMarkdown());
@@ -82,7 +94,6 @@ public class MarkdownPresenterImpl implements MarkdownPresenter {
             } else {
                 listener.onError(result);
             }
-            tmpFile = null;
         };
         fileLoader.run();
     }

app/src/main/java/com/wbrawner/simplemarkdown/view/activity/ExplorerActivity.java

@@ -0,0 +1,221 @@
+package com.wbrawner.simplemarkdown.view.activity;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Environment;
+import android.os.Handler;
+import android.support.design.widget.FloatingActionButton;
+import android.support.design.widget.Snackbar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ListView;
+import android.widget.SimpleAdapter;
+
+import com.wbrawner.simplemarkdown.R;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.TreeSet;
+
+public class ExplorerActivity extends AppCompatActivity {
+    private Handler fileHandler = new Handler();
+    private ListView listView;
+    private File[] mounts;
+    private String docsDirPath;
+    private String defaultDocsDirPath;
+    private int requestCode;
+    private String filePath;
+    private boolean isSave = false;
+    private EditText fileName;
+    private Button saveButton;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_explorer);
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        setSupportActionBar(toolbar);
+
+        Intent intent = getIntent();
+        if (intent == null || !intent.hasExtra(MainActivity.EXTRA_REQUEST_CODE)) {
+            finish();
+            return;
+        }
+
+        defaultDocsDirPath = Environment.getExternalStorageDirectory() + "/" +
+                Environment.DIRECTORY_DOCUMENTS;
+        docsDirPath = defaultDocsDirPath;
+
+        requestCode = intent.getIntExtra(MainActivity.EXTRA_REQUEST_CODE, -1);
+        switch (requestCode) {
+            case MainActivity.OPEN_FILE_REQUEST:
+                break;
+            case MainActivity.SAVE_FILE_REQUEST:
+                isSave = true;
+                fileName = findViewById(R.id.file_name);
+                fileName.setVisibility(View.VISIBLE);
+                if (intent.hasExtra(MainActivity.EXTRA_FILE)) {
+                    File file = (File) intent.getSerializableExtra(MainActivity.EXTRA_FILE);
+                    if (file.exists() && file.canWrite()) {
+                        docsDirPath = file.getParentFile().getAbsolutePath();
+                        fileName.setText(file.getName());
+                    } else {
+                        fileName.setText("Untitled.md");
+                    }
+                }
+                saveButton = findViewById(R.id.button_save);
+                saveButton.setVisibility(View.VISIBLE);
+                saveButton.setOnClickListener((v) -> {
+                    Intent fileIntent = new Intent();
+                    String absolutePath = String.format(
+                            Locale.ENGLISH,
+                            "%s/%s",
+                            filePath,
+                            fileName.getText().toString()
+                    );
+                    fileIntent.putExtra(MainActivity.EXTRA_FILE_PATH, absolutePath);
+                    setResult(RESULT_OK, fileIntent);
+                    finish();
+                });
+                break;
+            default:
+                finish();
+                return;
+        }
+//        FloatingActionButton fab = findViewById(R.id.fab);
+//        fab.setOnClickListener(view ->
+//                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
+//                        .setAction("Action", null)
+//                        .show()
+//        );
+
+        listView = findViewById(R.id.file_list);
+        File docsDir = new File(docsDirPath);
+        if (!docsDir.exists()) {
+            docsDir = Environment.getExternalStorageDirectory();
+        }
+        updateListView(docsDir);
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        if (hasRemovableStorage()) {
+            getMenuInflater().inflate(R.menu.menu_explorer, menu);
+            if (filePath.contains(mounts[1].getAbsolutePath())) {
+                menu.findItem(R.id.action_use_sdcard).setChecked(true);
+            }
+            return true;
+        }
+        return false;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.action_use_sdcard:
+                if (!hasRemovableStorage()) {
+                    // We shouldn't get here to begin with but better safe than sorry
+                    break;
+                }
+                item.setChecked(!item.isChecked());
+                if (item.isChecked()) {
+                    updateListView(mounts[1]);
+                } else {
+                    updateListView(new File(defaultDocsDirPath));
+                }
+        }
+        return true;
+    }
+
+    private boolean hasRemovableStorage() {
+        mounts = getExternalFilesDirs(Environment.DIRECTORY_DOCUMENTS);
+        return mounts.length > 1;
+    }
+
+    private List<HashMap<String, Object>> loadFiles(File docsDir) {
+        TreeSet files = new TreeSet<HashMap<String, Object>>((o1, o2) ->
+                ((String) o1.get("name")).compareToIgnoreCase((String) o2.get("name"))) {
+        };
+        TreeSet dirs = new TreeSet<HashMap<String, Object>>((o1, o2) ->
+                ((String) o1.get("name")).compareToIgnoreCase((String) o2.get("name"))) {
+        };
+        if (docsDir.getParentFile() != null && docsDir.getParentFile().canRead()) {
+            HashMap<String, Object> fileHashMap = new HashMap<>();
+            fileHashMap.put("name", "..");
+            fileHashMap.put("file", docsDir.getParentFile());
+            dirs.add(fileHashMap);
+        }
+
+        if (docsDir.listFiles() != null) {
+            for (File file : docsDir.listFiles()) {
+                if (file.isDirectory()) {
+                    HashMap<String, Object> fileHashMap = new HashMap<>();
+                    fileHashMap.put("name", file.getName());
+                    fileHashMap.put("file", file);
+                    dirs.add(fileHashMap);
+                    continue;
+                }
+                if (!file.getName().endsWith("md")
+                        && !file.getName().endsWith("markdown")
+                        && !file.getName().endsWith("text")) {
+                    continue;
+                }
+                HashMap<String, Object> fileHashMap = new HashMap<>();
+                fileHashMap.put("name", file.getName());
+                fileHashMap.put("file", file);
+                files.add(fileHashMap);
+            }
+        }
+
+        List<HashMap<String, Object>> sortedFiles = new ArrayList<>(dirs);
+        sortedFiles.addAll(files);
+
+        return sortedFiles;
+    }
+
+    private void updateListView(File filesDir) {
+        setTitle(filesDir.getName());
+        filePath = filesDir.getAbsolutePath();
+        fileHandler.post(() -> {
+            List<HashMap<String, Object>> files = loadFiles(filesDir);
+
+            listView.setAdapter(new SimpleAdapter(
+                    this,
+                    files,
+                    android.R.layout.simple_list_item_1,
+                    new String[]{"name"},
+                    new int[]{android.R.id.text1}
+            ));
+
+            listView.setOnItemClickListener((parent, view, position, id) -> {
+                File clickedFile = (File) files.get(position).get("file");
+                if (clickedFile.isFile()) {
+                    handleFileClick(clickedFile);
+                } else if (clickedFile.isDirectory()) {
+                    updateListView(clickedFile);
+                }
+            });
+        });
+    }
+
+    void handleFileClick(File file) {
+        if (isSave) {
+            if (fileName != null) {
+                fileName.setText(file.getName());
+            }
+        } else {
+            Intent fileIntent = new Intent();
+            fileIntent.putExtra(MainActivity.EXTRA_FILE, file);
+            setResult(RESULT_OK, fileIntent);
+            finish();
+        }
+    }
+}

app/src/main/java/com/wbrawner/simplemarkdown/view/activity/MainActivity.java

@@ -1,15 +1,11 @@
 package com.wbrawner.simplemarkdown.view.activity;
 
 import android.Manifest;
-import android.content.ActivityNotFoundException;
 import android.content.Intent;
 import android.content.pm.PackageManager;
 import android.content.res.Configuration;
-import android.database.Cursor;
-import android.net.Uri;
 import android.os.Build;
 import android.os.Environment;
-import android.provider.OpenableColumns;
 import android.support.design.widget.TabLayout;
 import android.support.v4.app.ActivityCompat;
 import android.support.v4.content.ContextCompat;
@@ -28,6 +24,8 @@ import com.wbrawner.simplemarkdown.MarkdownApplication;
 import com.wbrawner.simplemarkdown.R;
 import com.wbrawner.simplemarkdown.presentation.MarkdownPresenter;
 import com.wbrawner.simplemarkdown.view.adapter.EditPagerAdapter;
+
+import java.io.File;
 import java.io.InputStream;
 
 import javax.inject.Inject;
@@ -38,8 +36,12 @@ import butterknife.ButterKnife;
 public class MainActivity extends AppCompatActivity
         implements ActivityCompat.OnRequestPermissionsResultCallback {
 
-    public static final int WRITE_PERMISSION_REQUEST = 0;
+    static final int WRITE_PERMISSION_REQUEST = 0;
-    private static final int OPEN_FILE_REQUEST = 1;
+    static final int OPEN_FILE_REQUEST = 1;
+    static final int SAVE_FILE_REQUEST = 2;
+    static final String EXTRA_FILE = "EXTRA_FILE";
+    static final String EXTRA_FILE_PATH = "EXTRA_FILE_PATH";
+    static final String EXTRA_REQUEST_CODE = "EXTRA_REQUEST_CODE";
     public static final String AUTHORITY = "com.wbrawner.simplemarkdown.fileprovider";
 
     @Inject
@@ -93,7 +95,7 @@ public class MainActivity extends AppCompatActivity
                         MainActivity.this,
                         Manifest.permission.WRITE_EXTERNAL_STORAGE
                 ) == PackageManager.PERMISSION_GRANTED)
-                    showSaveDialog();
+                    requestSave();
                 else {
                     if (Build.VERSION.SDK_INT >= 23) {
                         requestPermissions(
@@ -113,7 +115,21 @@ public class MainActivity extends AppCompatActivity
                 ));
                 break;
             case R.id.action_load:
+                if (ContextCompat.checkSelfPermission(
+                        MainActivity.this,
+                        Manifest.permission.WRITE_EXTERNAL_STORAGE
+                ) == PackageManager.PERMISSION_GRANTED)
                     requestOpen();
+                else {
+                    if (Build.VERSION.SDK_INT >= 23) {
+                        requestPermissions(
+                                new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
+                                OPEN_FILE_REQUEST
+                        );
+                    }
+                }
+                break;
+            case R.id.action_new:
                 break;
             case R.id.action_help:
                 showInfoActivity(R.id.action_help);
@@ -181,10 +197,6 @@ public class MainActivity extends AppCompatActivity
             if (input.getText().length() > 0) {
                 presenter.setFileName(input.getText().toString());
                 setTitle(presenter.getFileName());
-                if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
-                    String path = getDocsPath() + input.getText();
-                    presenter.saveMarkdown(path);
-                }
             }
         });
         builder.setNegativeButton("Cancel", (dialog, which) -> {
@@ -214,7 +226,19 @@ public class MainActivity extends AppCompatActivity
                     Toast.makeText(MainActivity.this, R.string.no_permissions, Toast.LENGTH_SHORT)
                             .show();
                 }
-                return;
+                break;
+            }
+            case OPEN_FILE_REQUEST: {
+                if (grantResults.length > 0
+                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
+                    // Permission granted, open file save dialog
+                    requestOpen();
+                } else {
+                    // Permission denied, do nothing
+                    Toast.makeText(MainActivity.this, R.string.no_permissions, Toast.LENGTH_SHORT)
+                            .show();
+                }
+                break;
             }
         }
     }
@@ -231,29 +255,44 @@ public class MainActivity extends AppCompatActivity
     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
         switch (requestCode) {
             case OPEN_FILE_REQUEST:
-                if (resultCode == RESULT_OK) {
+                if (resultCode != RESULT_OK || data == null || !data.hasExtra(EXTRA_FILE)) {
-                    presenter.loadFromUri(MainActivity.this, data.getData());
+                    break;
                 }
+
+                presenter.loadMarkdown((File) data.getSerializableExtra(EXTRA_FILE));
+                break;
+            case SAVE_FILE_REQUEST:
+                if (resultCode != RESULT_OK
+                        || data == null
+                        || !data.hasExtra(EXTRA_FILE_PATH)
+                        || data.getStringExtra(EXTRA_FILE_PATH).isEmpty()) {
+                    break;
+                }
+                String path = data.getStringExtra(EXTRA_FILE_PATH);
+                presenter.saveMarkdown(path);
+                setTitle(presenter.getFileName());
+                break;
         }
         super.onActivityResult(requestCode, resultCode, data);
     }
 
     private void requestOpen() {
-        Intent openIntent = new Intent(Intent.ACTION_GET_CONTENT);
+        Intent intent = new Intent(MainActivity.this, ExplorerActivity.class);
-        openIntent.setType("text/*");
+        intent.putExtra(EXTRA_REQUEST_CODE, OPEN_FILE_REQUEST);
-        openIntent.addCategory(Intent.CATEGORY_OPENABLE);
-        try {
         startActivityForResult(
-                    Intent.createChooser(
+                intent,
-                            openIntent,
-                            getString(R.string.open_file)
-                    ),
                 OPEN_FILE_REQUEST
         );
-        } catch (ActivityNotFoundException e) {
-            Toast.makeText(MainActivity.this, R.string.no_filebrowser, Toast.LENGTH_SHORT)
-                    .show();
     }
+
+    private void requestSave() {
+        Intent intent = new Intent(MainActivity.this, ExplorerActivity.class);
+        intent.putExtra(EXTRA_REQUEST_CODE, SAVE_FILE_REQUEST);
+        intent.putExtra(EXTRA_FILE, presenter.getFile());
+        startActivityForResult(
+                intent,
+                SAVE_FILE_REQUEST
+        );
     }
 
     @Override

app/src/main/res/layout/activity_explorer.xml

@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="com.wbrawner.simplemarkdown.view.activity.ExplorerActivity">
+
+    <android.support.design.widget.AppBarLayout
+        android:id="@+id/toolbarContainer"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:theme="@style/AppTheme.AppBarOverlay"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <android.support.v7.widget.Toolbar
+            android:id="@+id/toolbar"
+            android:layout_width="match_parent"
+            android:layout_height="?attr/actionBarSize"
+            android:background="?attr/colorPrimary"
+            app:popupTheme="@style/AppTheme.PopupOverlay" />
+
+    </android.support.design.widget.AppBarLayout>
+
+    <include
+        android:id="@+id/file_list_container"
+        layout="@layout/content_explorer"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@id/file_name"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/toolbarContainer" />
+
+    <android.support.design.widget.FloatingActionButton
+        android:id="@+id/fab"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|end"
+        android:layout_margin="@dimen/fab_margin"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:visibility="gone"
+        app:layout_constraintBottom_toTopOf="@+id/file_name"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:srcCompat="@android:drawable/ic_input_add" />
+
+    <EditText
+        android:id="@+id/file_name"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:visibility="gone"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:layout_marginStart="8dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/button_save"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <Button
+        android:id="@+id/button_save"
+        style="@style/ButtonRed"
+        android:visibility="gone"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:layout_marginEnd="8dp"
+        android:text="@string/action_save"
+        android:textAllCaps="true"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

app/src/main/res/layout/content_explorer.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    app:layout_behavior="@string/appbar_scrolling_view_behavior"
+    tools:context="com.wbrawner.simplemarkdown.view.activity.ExplorerActivity"
+    tools:showIn="@layout/activity_explorer">
+
+    <ListView
+        android:id="@+id/file_list"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

app/src/main/res/menu/menu_edit.xml

@@ -14,7 +14,13 @@
     <item
         android:id="@+id/action_load"
         android:orderInCategory="100"
-        android:title="@string/action_load"
+        android:title="@string/action_open"
+        app:showAsAction="never" />
+    <item
+        android:id="@+id/action_new"
+        android:visible="false"
+        android:orderInCategory="150"
+        android:title="@string/action_new"
         app:showAsAction="never" />
     <item
         android:id="@+id/action_help"

app/src/main/res/menu/menu_explorer.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:title="@string/action_use_sdcard"
+        android:id="@+id/action_use_sdcard"
+        app:showAsAction="never"
+        android:checkable="true" />
+</menu>

app/src/main/res/values/colors.xml

@@ -2,5 +2,5 @@
 <resources>
     <color name="colorPrimary">#d32f2f</color>
     <color name="colorPrimaryDark">#b71c1c</color>
-    <color name="colorAccent">#ef9a9a</color>
+    <color name="colorAccent">#d32f2f</color>
 </resources>

app/src/main/res/values/strings.xml

@@ -24,4 +24,9 @@
     <string name="error_write">An error occurred while writing the file</string>
     <string name="file_load_error">An error occurred while opening the file</string>
     <string name="action_libraries">Libraries</string>
+    <string name="title_activity_explorer">ExplorerActivity</string>
+    <string name="action_new">New</string>
+    <string name="action_use_sdcard">Use SD Card</string>
+    <string name="action_done">Done</string>
+    <string name="action_open">Open</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -21,4 +21,9 @@
 
     <style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
 
+    <style name="ButtonRed">
+        <item name="android:background">@color/colorAccent</item>
+        <item name="android:textColor">#FFFFFF</item>
+    </style>
+
 </resources>