今天在调用MediaRecorder.stop()，报错了，java.lang.RuntimeException: stop failed.

E/AndroidRuntime(7698): Cause by: java.lang.RuntimeException: stop failed.
E/AndroidRuntime(7698):            at android.media.MediaRecorder.stop(Native Method)
E/AndroidRuntime(7698):            at com.tintele.sos.VideoRecordService.stopRecord(VideoRecordService.java:298)

报错代码如下：

	if (mediarecorder != null) {
			mediarecorder.stop();
			mediarecorder.release();
			mediarecorder = null;
			if (mCamera != null) {
				mCamera.release();
				mCamera = null;
			}
		}

stop()方法源代码如下：

/**
     * Stops recording. Call this after start(). Once recording is stopped,
     * you will have to configure it again as if it has just been constructed.
     * Note that a RuntimeException is intentionally thrown to the
     * application, if no valid audio/video data has been received when stop()
     * is called. This happens if stop() is called immediately after
     * start(). The failure lets the application take action accordingly to
     * clean up the output file (delete the output file, for instance), since
     * the output file is not properly constructed when this happens.
     *
     * @throws IllegalStateException if it is called before start()
     */
    public native void stop() throws IllegalStateException;

源代码中说了：Note that a RuntimeException is intentionally thrown to the application, if no valid audio/video data has been received when stop() is called. This happens if stop() is called immediately after start().The failure lets the application take action accordingly to clean up the output file (delete the output file, for instance), since the output file is not properly constructed when this happens.

现在，在mediarecorder.stop();这一句报错了，现在在mediarecorder.stop();这句之前加几句就不会报错了

mediarecorder.setOnErrorListener(null);
mediarecorder.setOnInfoListener(null);  
mediarecorder.setPreviewDisplay(null);

改后代码如下：

if (mediarecorder != null) {
			//added by ouyang start
			try {
				//下面三个参数必须加，不加的话会奔溃，在mediarecorder.stop();
				//报错为：RuntimeException:stop failed
				mediarecorder.setOnErrorListener(null);
				mediarecorder.setOnInfoListener(null);  
				mediarecorder.setPreviewDisplay(null);
				mediarecorder.stop();
			} catch (IllegalStateException e) {
				// TODO: handle exception
				Log.i("Exception", Log.getStackTraceString(e));
			}catch (RuntimeException e) {
				// TODO: handle exception
				Log.i("Exception", Log.getStackTraceString(e));
			}catch (Exception e) {
				// TODO: handle exception
				Log.i("Exception", Log.getStackTraceString(e));
			}
			//added by ouyang end
			
			mediarecorder.release();
			mediarecorder = null;
			if (mCamera != null) {
				mCamera.release();
				mCamera = null;
			}
		}