Android Open Source - 2014-Droid-code Activity2

• Back to Example/course  ↑

From Project

Back to project page 2014-Droid-code.

License

The source code is released under:

GNU General Public License

Java Source Code

package cs518.sample.activityLifecycle;
//from www  . j  a  va2 s.c  o m

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
/*
 * In Activity2 we use the instanceStateBundle to maintain the counter information
 * In MyActivityLifeCycleActivity.java we do not save any state. 
 * note the run time differences, when/is the counter reset 
 * 
 */
public class Activity2 extends Activity {
  protected int counter = 0;

  public static final String TAG = "LIFECYC2";

  /** Called when the activity is first created. */
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d(TAG, "onCreate() ");
    setContentView(R.layout.main);
        // restore savedInstanceState here or in onRestoreInstanceState(Bundle)
    if (savedInstanceState != null )
      counter = savedInstanceState.getInt("counter");

    Button killButton = (Button) findViewById(R.id.killButton);
    killButton.setOnClickListener(new OnClickListener() {
      //@Override
      public void onClick(View v) {
        Log.d(TAG, "finish()");
        finish();
      }
    });

    Button countButton = (Button) findViewById(R.id.countButton);
    // don't use the button in the 
    countButton.setOnClickListener(new OnClickListener() {
      //@Override
      public void onClick(View v) {
        Log.d(TAG, "counting");
        counter++;
        updateCounter();
      }
    });
    // don't use button on 2nd activity
    Button activityButton = (Button) findViewById(R.id.activityButton);
    activityButton.setVisibility(View.INVISIBLE);  

  }  //onCreate()

  @Override
  protected void onStart() {
    super.onStart();
    Log.d(TAG, "onStart()");
  }

  @Override
  protected void onResume() {
    super.onResume();
    Log.d(TAG, "onResume()");
  }

  @Override
  protected void onPause() {
    super.onPause();
    Log.d(TAG, "onPause()");
  }
  @Override
  protected void onStop() {
    super.onStop();
    Log.d(TAG, "onStop()");
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    Log.d(TAG, "onDestroy()");
  }
  @Override
  protected void onRestart() {
    super.onRestart();
    Log.d(TAG, "onRestart()");
  }
    // if called it will be run before onStop(
  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    Log.d(TAG, "onSaveInstanceState()");
    outState. putInt("counter", counter);
  }

  // only called if activity killed 
  // restore savedInstanceState here or in onCreate(Bundle)
  protected void onRestoreInstanceState(Bundle inState) { 
    super.onRestoreInstanceState(inState);
    Log.d(TAG, "onRestoreInstanceState(");
    // restore savedInstanceState here or in onCreate(Bundle)
    counter = inState.getInt("counter");
    updateCounter();
  }


  private void updateCounter() {
    TextView textView = (TextView) findViewById(R.id.counterValue);
    textView.setText("Actual counter: " + counter);
  }
  public static void testMe() {
    Log.d(TAG, "testMe()");
  }
}

Java Source Code List

• Back to Example/course  ↑