Simplify back button handling

Author: alxndrsn

app/src/main/AndroidManifest.xml

@@ -32,7 +32,7 @@
         <activity
             android:name=".MainActivity"
             android:configChanges="keyboardHidden|orientation"
-            android:screenOrientation="portrait" android:noHistory="true">
+            android:screenOrientation="portrait">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/Camera2TestActivity.java

@@ -144,12 +144,6 @@ protected void onDestroy() {
             mOpenCvCameraView.disableView();
     }
 
-    @Override
-    public void onBackPressed() {
-        Intent intent = new Intent(this, MainActivity.class);
-        startActivity(intent);
-    }
-
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.

app/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/ExpirationDateActivity.java

@@ -119,12 +119,6 @@ protected void onDestroy() {
             mOpenCvCameraView.disableView();
     }
 
-    @Override
-    public void onBackPressed() {
-        Intent intent = new Intent(this, MainActivity.class);
-        startActivity(intent);
-    }
-
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.

app/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/ImageQualityActivity.java

@@ -200,16 +200,6 @@ protected void onDestroy() {
         unloadReference();
     }
 
-    @Override
-    public void onBackPressed() {
-        if(isExternalIntent()) {
-            super.onBackPressed();
-        } else {
-            Intent intent = new Intent(this, MainActivity.class);
-            startActivity(intent);
-        }
-    }
-
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         // Inflate the menu; this adds items to the action bar if it is present.

app/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/ImageResultActivity.java

@@ -63,13 +63,6 @@ private void initViews() {
         sendImageButton.setOnClickListener(this);
     }
 
-    @Override
-    public void onBackPressed() {
-        super.onBackPressed();
-        Intent intent = new Intent(this, MainActivity.class);
-        startActivity(intent);
-    }
-
     @Override
     public void onClick(View view) {
         if (view.getId() == R.id.saveButton) {

app/src/main/java/edu/washington/cs/ubicomplab/rdt_reader/MainActivity.java

@@ -132,10 +132,4 @@ public void onClickPositiveButton() {
         setContentView(R.layout.activity_main);
         initViews();
     }
-
-    @Override
-    public void onBackPressed() {
-        super.onBackPressed();
-        finish();
-    }
 }