Android Open Source - Torch Main Activity

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From Project

Back to project page Torch.

License

The source code is released under:

Apache License

Java Source Code

package com.batz.guidlight;
/* w ww  . j  a v a  2 s.  co m*/
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;

public class MainActivity extends Activity {

  private boolean isLighOn = false;
  private Camera camera;
  private ImageButton button;

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

    if (camera != null) {
      camera.release();
    }
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    button = (ImageButton) findViewById(R.id.buttonFlashlight);
    Context context = this;
    PackageManager pm = context.getPackageManager();

    // if device support camera?
    if (!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
      Log.e("err", "Device has no camera!");
      return;
    }

//    camera = Camera.open();
//    final Parameters p = camera.getParameters();

    button.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View arg0) {
        
        if(camera == null){
          camera = Camera.open();
        }
        
        final Parameters p = camera.getParameters();

        if (isLighOn) {

          Log.i("info", "torch is turn off!");
          button.setBackgroundResource(R.drawable.on);
          isLighOn = false;
          p.setFlashMode(Parameters.FLASH_MODE_OFF);
          camera.setParameters(p);
          camera.stopPreview();
          //camera.release();
          
          

        } else {

          Log.i("info", "torch is turn on!");
          button.setBackgroundResource(R.drawable.off);
          p.setFlashMode(Parameters.FLASH_MODE_TORCH);
          camera.setParameters(p);
          camera.startPreview();
          isLighOn = true;
          

        }

      }
    });

  }

  @Override
  protected void onPause() {
    super.onPause();
    try {
      camera.stopPreview();
      camera.setPreviewCallback(null);
      camera.release();
      camera = null;

    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  @Override
  protected void onResume() {
    super.onResume();
    try {
      camera = Camera.open();
      camera.setPreviewCallback(null);
    } catch (Exception e) {

    }
  }

}

Java Source Code List

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