How to Save Activity state in Android

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import android.os.Bundle;
import android.widget.TextView;
public class HelloAndroid extends Activity {
    /** Called when the activity is first created. */
    public void onCreate(Bundle savedInstanceState) {
        mTextView = new TextView(this);
        if (savedInstanceState == null) {
            mTextView.setText("Welcome to HelloAndroid!");
        } else {
            mTextView.setText("Welcome back.");
    private TextView mTextView = null;
  1. Post:397

    Re: How to Save Activity state in Android

    You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter like this:

    public void onSaveInstanceState(Bundle 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);
      savedInstanceState.putDouble("myDouble", 1.9);
      savedInstanceState.putInt("MyInt", 1);
      savedInstanceState.putString("MyString", "Welcome back to Android");
      // etc.
    The Bundle is essentially a way of storing a NVP ("Name-Value Pair") map, and it will get passed in to onCreate() and also onRestoreInstanceState() where you'd extract the values like this:

    public void onRestoreInstanceState(Bundle savedInstanceState) {
      // Restore UI state from the savedInstanceState.
      // This bundle has also been passed to onCreate.
      boolean myBoolean = savedInstanceState.getBoolean("MyBoolean");
      double myDouble = savedInstanceState.getDouble("myDouble");
      int myInt = savedInstanceState.getInt("MyInt");
      String myString = savedInstanceState.getString("MyString");
    You would usually use this technique to store instance values for your application (selections, unsaved text, etc.).