Android Open Source - coursera-android-001 Activity Two

From Project

Back to project page coursera-android-001.
License

The source code is released under:
MIT License
If you think the Android project coursera-android-001 listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package course.labs.activitylab;
//from   w ww  .  jav  a  2  s .  c  om
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;

public class ActivityTwo extends Activity {

  private static final String RESTART_KEY = "restart";
  private static final String RESUME_KEY = "resume";
  private static final String START_KEY = "start";
  private static final String CREATE_KEY = "create";

  // String for LogCat documentation
  private final static String TAG = "Lab-ActivityTwo";

  // Lifecycle counters
    int mCreate = 0;
    int mStart = 0;
    int mResume = 0;
    int mRestart = 0;

    TextView mTvCreate;
    TextView mTvStart;
    TextView mTvResume;
    TextView mTvRestart;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_two);

    // Assign the appropriate TextViews to the TextView variables
        mTvCreate = (TextView) findViewById(R.id.create);
        mTvStart = (TextView) findViewById(R.id.start);
        mTvResume = (TextView) findViewById(R.id.resume);
        mTvRestart = (TextView) findViewById(R.id.restart);

    Button closeButton = (Button) findViewById(R.id.bClose); 
    closeButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        // This function closes Activity Two
                finish();
      }
    });

    // Check for previously saved state
    if (savedInstanceState != null) {
      // Restore value of counters from saved state
            mCreate = savedInstanceState.getInt(CREATE_KEY);
            mStart = savedInstanceState.getInt(START_KEY);
            mResume = savedInstanceState.getInt(RESUME_KEY);
            mRestart = savedInstanceState.getInt(RESTART_KEY);
    }

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onCreate() method");

    // Update the appropriate count variable
    // Update the user interface via the displayCounts() method
        mCreate++;
        displayCounts();
  }

  // Lifecycle callback methods overrides

  @Override
  public void onStart() {
    super.onStart();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onStart() method");

    // Update the appropriate count variable
    // Update the user interface
        mStart++;
        displayCounts();
  }

  @Override
  public void onResume() {
    super.onResume();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onResume() method");

    // Update the appropriate count variable
    // Update the user interface
        mResume++;
        displayCounts();
  }

  @Override
  public void onPause() {
    super.onPause();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onPause() method");
  }

  @Override
  public void onStop() {
    super.onStop();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onStop() method");
  }

  @Override
  public void onRestart() {
    super.onRestart();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onRestart() method");

    // Update the appropriate count variable
    // Update the user interface
        mRestart++;
        displayCounts();
  }

  @Override
  public void onDestroy() {
    super.onDestroy();

    // TODO: Emit LogCat message
        Log.i(TAG, "Entered the onDestroy() method");
  }

  @Override
  public void onSaveInstanceState(Bundle savedInstanceState) {
    // Save counter state information with a collection of key-value pairs
        savedInstanceState.putInt(CREATE_KEY, mCreate);
        savedInstanceState.putInt(START_KEY, mStart);
        savedInstanceState.putInt(RESUME_KEY, mResume);
        savedInstanceState.putInt(RESTART_KEY, mRestart);
  }

  // Updates the displayed counters
  public void displayCounts() {
    mTvCreate.setText("onCreate() calls: " + mCreate);
    mTvStart.setText("onStart() calls: " + mStart);
    mTvResume.setText("onResume() calls: " + mResume);
    mTvRestart.setText("onRestart() calls: " + mRestart);
  }
}
Java Source Code List
