Android Open Source - FlashLight Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.paladin.flashlightcallstrobe;
/*  w  w w.  j a  va2  s .co  m*/
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;

public class MainActivity extends Activity implements OnClickListener {

  private ImageButton switchButton;
  private Context context;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

    // load the view from the xml
    setContentView(R.layout.activity_main);

    context = this;
    // link our object to the xml
    switchButton = (ImageButton) findViewById(R.id.switchButton);

    // listen to user clicks on our image button
    switchButton.setOnClickListener(this);

    /*
     * because not all the devices have a flash, we need to check if there a
     * flash support and notify the user about it.
     */
    if (!CameraUtils.deviceHasFlash(context)) {
      // the user doesn't have flash support!
      // create an Alert Dialog and show it to the user.

      AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
          context);

      // set title for our dialog
      alertDialogBuilder.setTitle(getString(R.string.dialog_title));

      // set dialog message
      alertDialogBuilder.setMessage(getString(R.string.dialog_body));
      // add a button to dismiss the dialog
      alertDialogBuilder.setPositiveButton(getString(R.string.dismiss),
          new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
              // when this button is clicked, close
              // current activity, or
              finish();
            }
          });
      // create alert dialog
      AlertDialog alertDialog = alertDialogBuilder.create();
      // show it to the user
      alertDialog.show();

    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu;
    // this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }

  @Override
  public void onClick(View v) {
    // here we decide what to do when the user clicks the button
    // turn the flash on or off
    if (CameraUtils.isFlashOn) {
      // turn off flash
      turnOffFlash();
    } else {
      // turn on flash
      turnOnFlash();
    }
  }

  /**
   * Turn On flash ?
   */
  private void turnOnFlash() {
    // turn the flash on
    CameraUtils.turnOnFlash();
    // change the image on the button
    toggleButtonImage();
  }

  /**
   * Turn Off flash
   */
  private void turnOffFlash() {
    // turn the flash off
    CameraUtils.turnOffFlash();
    // change the image on the button
    toggleButtonImage();
  }

  /**
   * set the image of the button according to the flash state
   */
  private void toggleButtonImage() {
    // change the image on the button according to the
    // new state of the flash light
    if (CameraUtils.isFlashOn) {
      switchButton.setImageResource(R.drawable.ic_button_on);
    } else {
      switchButton.setImageResource(R.drawable.ic_button_off);
    }
  }

  @Override
  protected void onStart() {
    super.onStart();
    // when the app starts,
    // init the camera and the camera parameters.
    CameraUtils.getCamera();
  }

  @Override
  protected void onStop() {
    super.onStop();
    // when the app stops,
    // release the camera
    CameraUtils.releaseCamera();
  }

}

Java Source Code List

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