Android Open Source - coursera-android-001 Activity One

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License

The source code is released under:

MIT License

Java Source Code

package course.labs.activitylab;
/*w  w  w .j a  v a  2s. co  m*/
import android.app.Activity;
import android.content.Intent;
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;

import org.w3c.dom.Text;

public class ActivityOne 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-ActivityOne";
  
  // 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_one);
    
    // 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 launchActivityTwoButton = (Button) findViewById(R.id.bLaunchActivityTwo); 
    launchActivityTwoButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        // Create an intent stating which Activity you would like to start
                Intent intent = new Intent(getApplicationContext(), ActivityTwo.class);
        
        // Launch the Activity using the intent
                startActivity(intent);
      }
    });
    
    // 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);

            Log.i(TAG, "savedInstanceState information loaded");
    }

    // 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 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 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);

        Log.i(TAG, "savedInstanceState information saved");
  }
  
  // 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

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