代码应该可以工作但是当我点击我的视频按钮停止录制时，我会收到一个＆＃34;致命异常＆＃34;崩溃，它告诉我mMediaRecorder.stop();行无法正常工作。
这是我的代码：
private CameraDevice.StateCallback mCameraDeviceStateCallback = new CameraDevice.StateCallback() {
@Override
public void onOpened(@NonNull CameraDevice camera) { //camera device member return back to me
mCameraDevice = camera;
// Toast.makeText(getApplicationContext(), "Camera connection made!", Toast.LENGTH_SHORT).show();
// ^indicates camera is connected
if (mIsRecording){
try{
createVideoFileName();
}
catch(IOException e) {
e.printStackTrace();
}
startRecord();
mMediaRecorder.start();
}
else {
startPreview();
}
}
//makes this marshallow version compatible for Android because from Marshallow version and onwards we needed...
//...the permissions required.
private void checkWriteStoragePermission(){
// v check to support applications on devices older than Marshmallow version in Android
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.lollipop) { //support Marshallow or later versions
// v check to see if granted permission
if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) ==
PackageManager.PERMISSION_GRANTED) {
mIsRecording = true;
mRecordImageButton.setImageResource(R.drawable.btn_video_busy); //not recording
try {
createVideoFileName(); //was giving an unhandled exception java long error so needed try/catch here
} catch (IOException e) {
e.printStackTrace();
}
startRecord();
mMediaRecorder.start();
}/* else { //check if permission was granted and had been denied
if (shouldShowRequestPermissionRationale(Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
Toast.makeText(this, "app needs to be able to save videos", Toast.LENGTH_SHORT).show();
}
requestPermissions(new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_WRITE_EXTERNAL_STORAGE_PERMISSION_RESULT);
} */
}
else //if running older versions than Marshallow, not going to worry about it, so build "else" statement
{ // supporting old versions of Android
mIsRecording = true;
mRecordImageButton.setImageResource(R.drawable.btn_video_busy); //not recording
try{
createVideoFileName();
}
catch (IOException e){
e.printStackTrace();
}
startRecord();
mMediaRecorder.start();
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
createVideoFolder(); //creates the video folder when camera page loads
mMediaRecorder = new MediaRecorder();
mTextureView = (TextureView) findViewById(R.id.textureView);
mRecordImageButton = (ImageButton) findViewById(R.id.videoOnlineImageButton);
mRecordImageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mIsRecording) {
mIsRecording = false;
mRecordImageButton.setImageResource(R.drawable.btn_video_online);
mMediaRecorder.stop(); //<-- FATAL EXCEPTION CRASH
mMediaRecorder.reset();
startPreview(); //< this code says = once it's stops recording TextureView preview still continues
} else {
checkWriteStoragePermission();
}
}
});
}
private void createVideoFolder() {
File movieFile = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES);
mVideoFolder = new File(movieFile, "camera2VideoImage");
if(!mVideoFolder.exists()) {
mVideoFolder.mkdirs();
}
}
12-23 22:23:07.509 14045-14045/com.example.name.videoscrolltrial E/MediaRecorder: stop failed: -1007
12-23 22:23:07.510 14045-14045/com.example.name.videoscrolltrial D/AndroidRuntime: Shutting down VM
12-23 22:23:07.511 14045-14045/com.example.name.videoscrolltrial E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.name.videoscrolltrial, PID: 14045
java.lang.RuntimeException: stop failed.
at android.media.MediaRecorder._stop(Native Method)
at android.media.MediaRecorder.stop(MediaRecorder.java:1220)
at com.example.name.videoscrolltrial.Camera$3.onClick(Camera.java:192) //< causes the crash, this is mMediaRecorder.stop();
at android.view.View.performClick(View.java:6308)
at android.view.View$PerformClick.run(View.java:23969)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6823)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1563)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1451)
此代码适用于Nexus 5X这样的手机，但对于我的三星Galaxy Note 8，它并不会造成崩溃。我不明白我必须做些什么来使代码兼容所有手机？
答案 0 :(得分：0)
如果不首先启动mediaRecorder，则无法停止它。