android-activity

How do I create a transparent Activity on Android?

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Add the following style in your res/values/styles.xml file (if you don’t have one, create it.) Here’s a complete file: <?xml version=”1.0″ encoding=”utf-8″?> <resources> <style name=”Theme.Transparent” parent=”android:Theme”> <item name=”android:windowIsTranslucent”>true</item> <item name=”android:windowBackground”>@android:color/transparent</item> <item name=”android:windowContentOverlay”>@null</item> <item name=”android:windowNoTitle”>true</item> <item name=”android:windowIsFloating”>true</item> <item name=”android:backgroundDimEnabled”>false</item> </style> </resources> (The value @color/transparent is the color value #00000000 which I put in the res/values/color.xml file. … Read more

How to manage startActivityForResult on Android

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From your FirstActivity, call the SecondActivity using the startActivityForResult() method. For example: int LAUNCH_SECOND_ACTIVITY = 1 Intent i = new Intent(this, SecondActivity.class); startActivityForResult(i, LAUNCH_SECOND_ACTIVITY); In your SecondActivity, set the data which you want to return back to FirstActivity. If you don’t want to return back, don’t set any. For example: In SecondActivity if you want … Read more

Activity restart on rotation Android

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Using the Application Class Depending on what you’re doing in your initialization you could consider creating a new class that extends Application and moving your initialization code into an overridden onCreate method within that class. public class MyApplicationClass extends Application { @Override public void onCreate() { super.onCreate(); // TODO Put your application initialization code here. … Read more

How do I pass data between Activities in Android application?

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In your current Activity, create a new Intent: String value=”Hello world”; Intent i = new Intent(CurrentActivity.this, NewActivity.class); i.putExtra(“key”,value); startActivity(i); Then in the new Activity, retrieve those values: Bundle extras = getIntent().getExtras(); if (extras != null) { String value = extras.getString(“key”); //The key argument here must match that used in the other activity } Use this … Read more

How can I save an activity state using the save instance state?

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You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this: @Override public void onSaveInstanceState(Bundle savedInstanceState) { super.onSaveInstanceState(savedInstanceState); // Save UI state changes to the savedInstanceState. // This bundle will be passed to onCreate if the process is // killed and restarted. savedInstanceState.putBoolean(“MyBoolean”, true); … Read more

How to stop EditText from gaining focus when an activity starts in Android?

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Adding the tags android:focusableInTouchMode=”true” and android:focusable=”true” to the parent layout (e.g. LinearLayout or ConstraintLayout) like in the following example, will fix the problem. <!– Dummy item to prevent AutoCompleteTextView from receiving focus –> <LinearLayout android:focusable=”true” android:focusableInTouchMode=”true” android:layout_width=”0px” android:layout_height=”0px”/> <!– :nextFocusUp and :nextFocusLeft have been set to the id of this component to prevent the dummy … Read more

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