MediaStore用法示例

MediaStore类向存储在设备上（无论是内部存储器还是外部存储器中）的媒体提供了一接口。MediaStore还提供了API来操作媒体。

这些API中包含在设备上搜索特定类型的媒体的机制，用于将音频和视频录制到存储器的Intent，以及建立播放列表的方式。

MediaStore便于简化操作。

下面是使用Intent来录制音频和拍照的简单示例。

public class MediaStoreTest extends Activity {
	private static final String TAG = "MediaStoreTest";
	private static final int RECORD_SOUND = 0;
	private static final int IMAGE_CAPTURE = 1;
	
	private Button btnRecord;
	private Button btnPhoto;
	
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        btnRecord = (Button)findViewById(R.id.btnRecord);
        btnRecord.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				startRecording();
			}
        	
        });
        
        btnPhoto = (Button)findViewById(R.id.btnPhoto);
        btnPhoto.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				takePhoto();
			}
        	
        });
    }
    
    public void startRecording() {
    	Intent intent = new Intent("android.provider.MediaStore.RECORD_SOUND");
    	startActivityForResult(intent, RECORD_SOUND);
    }
    public void takePhoto() {
    	Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    	String strFilePath = Environment.getExternalStorageDirectory() + "/take_photo/" + getDate() + ".jpeg";
    	Log.d(TAG, "strFilePath:" + strFilePath);
    	Uri uri = Uri.fromFile(new File(strFilePath));
    	intent.putExtra(MediaStore.EXTRA_OUTPUT, uri); // 设置照片的保存位置
    	startActivityForResult(intent, IMAGE_CAPTURE);
    }
    
    /**   
     * 获取系统时间   
     * @return   
     */    
    public static String getDate(){  
        Calendar ca = Calendar.getInstance();     
        int year = ca.get(Calendar.YEAR);           // 获取年份     
        int month = ca.get(Calendar.MONTH);         // 获取月份      
        int day = ca.get(Calendar.DATE);            // 获取日     
        int minute = ca.get(Calendar.MINUTE);       // 分      
        int hour = ca.get(Calendar.HOUR);           // 小时      
        int second = ca.get(Calendar.SECOND);       // 秒     
        int millisecond = ca.get(Calendar.MILLISECOND); // 毫秒  
         
        String date = "" + year + (month + 1 ) + day + hour + minute + second + millisecond;     
     
        return date;           
    }
    
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		switch(requestCode) {
		case RECORD_SOUND:
			if (resultCode == RESULT_OK) {
				Uri recordAudioPath = data.getData();
				Log.d(TAG, "recordAudioPath:" + recordAudioPath);
			}
			break;
		case IMAGE_CAPTURE:
//			if (resultCode == RESULT_OK) {
//				Bitmap bmp = (Bitmap)data.getExtras().get("data");
//				Log.d(TAG, "bmp width:" + bmp.getWidth() + ", height:" + bmp.getHeight());
//			}
			break;
		default:
			break;
		}
		
		super.onActivityResult(requestCode, resultCode, data);
	}
    
}