Android Open Source - Apps101CourseraCameraSample Camera Activity

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License

The source code is released under:

MIT License

Java Source Code

/**
 * @author Vishnu Indukuri//from ww w.j av a2  s  .c o m
 * @since 12/18/2013
 * @version 0.01
 * Licensed under the MIT License.  See the LICENSE file for more details.
 */
package indukuri.apps101.cameradrawsample;

import android.app.Activity;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.FrameLayout;
/**
 * The main activity of this project.  
 */
public class CameraActivity extends Activity {
  private FrameLayout layout ;
  private PictureSaver saver ;
  
  // May seem like bad programming practice but we highly recommend
  // (by us and Google) that only a single instance of this object 
  // ever exist and all classes use that specific instance.  Using 
  // the camera is a very strict state machine.
  public static Camera mCamera ;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // Ask to hide the Action Bar. This request must be made before setting 
    // the content of the activity or else an exception
    // will be thrown at runtime
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    // Dim the system UI 
    hideSystemNavigation();
    // Set the content
    setContentView(R.layout.activity_camera);
    
    // To get rid of the status bar, we use a xml feature
    // in the AndroidManifest.xml file.  Check out the 
    // android:theme under <application>
    
    // Get a reference to the layout so that we can add the 
    // preview
    layout = (FrameLayout) findViewById(R.id.camera_preview);
    
    // Add the camera preview
    layout.addView(new CameraPreview(this));
    
    // Instantiate our PictureSaver helper class
    saver = new PictureSaver(this);
  }
  
  // This is a neat little Android trick. In the XML layout file for this Activity,
  // we added an attribute called android:onClick="capturePicture" to the capture_button.  
  // That is all android needs to call this method when that button is pressed.  All you
  // need to do is make sure the method names match and the signature is 
  // public void whateveryouputinquotes(View view).  The View that is passed along to this
  // method is the one that was touched/clicked.  This saves us the trouble of creating
  // onClickListeners
  // ------------------------------------------------------------------------------------
  public void capturePicture(View view){
    mCamera.takePicture(null, null, saver.getSaver());
  }
  
  // Utility methods dealing with the camera
  // ------------------------------------------------------------------------------------
  private void hideSystemNavigation(){
    // This example uses decor view, but you can use any visible view.
    View decorView = getWindow().getDecorView();
    int uiOptions = View.SYSTEM_UI_FLAG_LOW_PROFILE;
    decorView.setSystemUiVisibility(uiOptions);
  }
}

Java Source Code List

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