Replaced EditText onTextChangedListener with RxJava implementation

app/build.gradle

@@ -1,4 +1,5 @@
 apply plugin: 'com.android.application'
+apply plugin: 'me.tatarka.retrolambda'
 
 android {
     packagingOptions {
@@ -10,6 +11,10 @@ android {
     }
     compileSdkVersion 26
     buildToolsVersion "26.0.0"
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
     defaultConfig {
         applicationId "com.wbrawner.simplemarkdown"
         minSdkVersion 15
@@ -40,6 +45,10 @@ dependencies {
     compile 'com.jakewharton:butterknife:8.7.0'
     compile 'com.android.support:support-v4:26.+'
     compile 'com.commonsware.cwac:anddown:0.3.0'
+    compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
+    compile 'io.reactivex.rxjava2:rxjava:2.1.0'
+    compile 'com.jakewharton.rxbinding2:rxbinding:2.0.0'
+    compile 'com.jakewharton.rxbinding2:rxbinding-design:2.0.0'
     testCompile 'junit:junit:4.12'
     annotationProcessor 'com.jakewharton:butterknife-compiler:8.7.0'
 }

app/src/main/java/com/wbrawner/simplemarkdown/EditFragment.java

@@ -23,13 +23,20 @@ import android.view.WindowManager;
 import android.widget.EditText;
 import android.widget.Toast;
 
+import com.jakewharton.rxbinding2.widget.RxTextView;
+
 import java.io.BufferedReader;
 import java.io.File;
 import java.io.FileOutputStream;
 import java.io.IOException;
+import java.util.concurrent.TimeUnit;
 
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import io.reactivex.Observable;
+import io.reactivex.Scheduler;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.schedulers.Schedulers;
 
 import static android.content.ContentValues.TAG;
 
@@ -77,20 +84,15 @@ public class EditFragment extends Fragment {
             getActivity().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
         }
 
-        mMarkdownEditor.addTextChangedListener(new TextWatcher() {
-            @Override
-            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
-            }
-
-            @Override
-            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
+        Observable<String> obs = RxTextView.textChanges(mMarkdownEditor)
+                .debounce(50, TimeUnit.MILLISECONDS).map(editable ->  editable.toString());
+        obs.subscribeOn(Schedulers.io());
+        obs.observeOn(AndroidSchedulers.mainThread());
+        obs.subscribe(string -> {
+            Log.d(TAG, "debounced " + string);
             updatePreview(mContext);
-            }
-
-            @Override
-            public void afterTextChanged(Editable editable) {
-            }
         });
+
         return view;
     }
 

build.gradle

@@ -6,7 +6,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.3'
-
+        classpath 'me.tatarka:gradle-retrolambda:3.2.3'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }