Android Open Source - led-flashlight L E D Flashlight

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From Project

Back to project page led-flashlight.

License

The source code is released under:

GNU General Public License

Java Source Code

package uk.org.assyrian.LEDFlashlight;
// ww w .  j a v a  2s .  c om
import java.util.List;

import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class LEDFlashlight extends Activity {
  
  private Button onOffButton;
  private String mFlashMode;
  private boolean mIsFlashOn;
  private Camera mCamera = null;
  
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
      // Log.d("LEDFlashlight", "entered onCreate");
      super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.d("LEDFlashlight", "Flashlight is" + (mIsFlashOn ? " " : " not ") + "on");
        this.onOffButton = (Button) this.findViewById(R.id.onoff);
        setupButton();
    }

  private void setupButton() {
    // Log.d("LEDFlashlight", "Setting up button");
    Button button = this.onOffButton;
    button.setOnClickListener(new OnClickListener() {
      
      @Override
      public void onClick(View v) {
        if (mIsFlashOn) {
          mIsFlashOn = turnFlashOff();
          v.setKeepScreenOn(false);
        } else {
          mIsFlashOn = turnFlashOn();
          v.setKeepScreenOn(true);
        }
        setButtonText();
      }
    });
    setButtonText();
    button.setBackgroundColor(0x000000);
    // Black! Black! As black as your heart! What's for tea, mother? Worms?
    button.setTextColor(0xFFFFFFFF); // white; note alpha channel
    button.setTextSize(30);
    button.setTypeface(button.getTypeface(), 1); // make it bold
    // Log.d("LEDFlashlight", "Set up button, text is " + onOffButton.getText());
  }
    
  private void setButtonText() {
    onOffButton.setText(mIsFlashOn ? R.string.turn_off : R.string.turn_on);
    onOffButton.refreshDrawableState();
  }

    private boolean turnFlashOff() {
      // Log.d("LEDFlashlight", "Turning flash off");
      mCamera.stopPreview();
      Parameters p = mCamera.getParameters();
      p.setFlashMode(mFlashMode);
      mCamera.setParameters(p);
      Log.d("LEDFlashlight", "Turned flash off");
    return false;
  }

  private boolean turnFlashOn() {
    // Log.d("LEDFlashlight", "Turning flash on");
    Parameters p = mCamera.getParameters();
    List<String> flashModes  = p.getSupportedFlashModes();
    if (flashModes.contains(Parameters.FLASH_MODE_TORCH)) {
      mFlashMode = p.getFlashMode();
      p.setFlashMode(Parameters.FLASH_MODE_TORCH);
      mCamera.setParameters(p);
      mCamera.startPreview();
      Log.d("LEDFlashlight", "Turned flash on");
      return true;
    }
    Log.d("LEDFlashlight", "FLASH_MODE_TORCH not supported");
    return false;
  }
  
  @Override
  protected void onPause() {
    // Log.d("LEDFlashlight", "Pausing");
    super.onPause();
    mCamera.release();
    // Log.d("LEDFlashlight", "Leaving onPause");
  }
  
  @Override
  protected void onResume() {
    // Log.d("LEDFlashlight", "Entering onResume");
    super.onResume();
    mCamera = Camera.open();
    // Log.d("LEDFlashlight", "Leaving onResume");
  }
}

Java Source Code List

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