Android Open Source - video Main Activity

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License

The source code is released under:

Apache License

Java Source Code

package edu.cs4730.piccapture2;
//w w  w. ja  v  a2 s .  com
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore.Files.FileColumns;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;

/*
 * This example based on android's example on there pages
 * http://developer.android.com/guide/topics/media/camera.html
 * 
 * The user presses a button in order to capture the picture.
 */
public class MainActivity extends Activity {

    private Camera mCamera;
    private CameraPreview mPreview;
    static int MEDIA_TYPE_IMAGE = 1;
    static int MEDIA_TYPE_VIDEO = 2;
    String TAG = "MainActivity";
    
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
        // Create an instance of Camera
        mCamera = getCameraInstance();

        // Create our Preview view and set it as the content of our activity.
        mPreview = new CameraPreview(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mPreview);
        
     // Add a listener to the Capture button
        Button captureButton = (Button) findViewById(R.id.button_capture);
        captureButton.setOnClickListener(
            new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // get an image from the camera
                    mCamera.takePicture(null, null, mPicture);
                }
            }
        );

  }
  
  
    @Override
    protected void onPause() {
        super.onPause();
        
        releaseCamera();              // release the camera immediately on pause event
    }

    private void releaseCamera(){
        if (mCamera != null){
            mCamera.release();        // release the camera for other applications
            mCamera = null;
        }
    }

  /** A safe way to get an instance of the Camera object. */
  public static Camera getCameraInstance(){
      Camera c = null;
      try {
          c = Camera.open(); // attempt to get a Camera instance
      }
      catch (Exception e){
          // Camera is not available (in use or does not exist)
      }
      return c; // returns null if camera is unavailable
  }
  
  /** Check if this device has a camera */
  private boolean checkCameraHardware(Context context) {
      if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)){
          // this device has a camera
          return true;
      } else {
          // no camera on this device
          return false;
      }
  }
  private PictureCallback mPicture = new PictureCallback() {

      @Override
      public void onPictureTaken(byte[] data, Camera camera) {

          File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
          if (pictureFile == null){
              Log.d(TAG, "Error creating media file, check storage permissions: ");
              return;
          }

          try {
              FileOutputStream fos = new FileOutputStream(pictureFile);
              fos.write(data);
              fos.close();
          } catch (FileNotFoundException e) {
              Log.d(TAG, "File not found: " + e.getMessage());
          } catch (IOException e) {
              Log.d(TAG, "Error accessing file: " + e.getMessage());
          }
          camera.startPreview();  //start backup the preview, once we have taken the picture.
      }
  };
  /** Create a file Uri for saving an image or video */
  private static Uri getOutputMediaFileUri(int type){
        return Uri.fromFile(getOutputMediaFile(type));
  }
  
  /** Create a File for saving an image or video */
  private static File getOutputMediaFile(int type){
      // To be safe, you should check that the SDCard is mounted
      // using Environment.getExternalStorageState() before doing this.

    //creates a directory in pictures.
      //File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "MyCameraApp");
    
      File mediaStorageDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
      // This location works best if you want the created images to be shared
      // between applications and persist after your app has been uninstalled.

      // Create the storage directory if it does not exist
      if (! mediaStorageDir.exists()){
          if (! mediaStorageDir.mkdirs()){
              Log.d("MyCameraApp", "failed to create directory");
              return null;
          }
      }

      // Create a media file name
      String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
      File mediaFile;
      if (type == MEDIA_TYPE_IMAGE){
          mediaFile = new File(mediaStorageDir.getPath() + File.separator +
          "IMG_"+ timeStamp + ".jpg");
      } else if(type == MEDIA_TYPE_VIDEO) {
          mediaFile = new File(mediaStorageDir.getPath() + File.separator +
          "VID_"+ timeStamp + ".mp4");
      } else {
          return null;
      }

      return mediaFile;
  }

}

Java Source Code List

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