android.view.SurfaceHolder#addCallback ( )源码实例Demo

@Override
public FrameLayout createView(LayerManager layerManager) {
  this.layerManager = layerManager;

  LayoutInflater inflater = layerManager.getActivity().getLayoutInflater();
  view = (FrameLayout) inflater.inflate(R.layout.video_surface_layer, null);

  layerManager.getExoplayerWrapper().addListener(playbackListener);

  surfaceView = (VideoSurfaceView) view.findViewById(R.id.surface_view);
  if (surfaceView != null) {
    SurfaceHolder holder = surfaceView.getHolder();
    holder.addCallback(surfaceHolderCallback);
  }

  return view;
}
 

@Override
protected void onResume() {
    super.onResume();
    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
        initCamera(surfaceHolder);
    } else {
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    decodeFormats = null;
    characterSet = null;

    playBeep = true;
    AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
    if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
        playBeep = false;
    }
    initBeepSound();
    vibrate = true;

}
 

@Override
protected void onResume() {
    super.onResume();
    Log.d(TAG, "xxxxxxxxxxxxxxxxxxxonResume");
    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
        initCamera(surfaceHolder);
    } else {
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }
    decodeFormats = null;
    characterSet = null;

    playBeep = true;
    final AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
    if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
        playBeep = false;
    }
    initBeepSound();
    vibrate = true;
}
 

public CameraSurfaceView(Context context) {
    super(context);

    final SurfaceHolder surfaceHolder = getHolder();
    surfaceHolder.addCallback(this);
    surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
 

@Override
protected void onResume() {
    super.onResume();

    // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't
    // want to open the camera driver and measure the screen size if we're going to show the help on
    // first launch. That led to bugs where the scanning rectangle was the wrong size and partially
    // off screen.
    mCameraManager = new CameraManager(getApplication());
    mViewfinderView.setCameraManager(mCameraManager);

    mHandler = null;

    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (mHasSurface) {
        // The activity was paused but not stopped, so the surface still exists. Therefore
        // surfaceCreated() won't be called, so init the camera here.
        initCamera(surfaceHolder);
    } else {
        // Install the callback and wait for surfaceCreated() to init the camera.
        surfaceHolder.addCallback(this);
    }

    mBeepManager.updatePrefs();
    mAmbientLightManager.start(mCameraManager);

    mInactivityTimer.onResume();
}
 

@Override
    protected void onResume() {
        super.onResume();
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.scanner_view);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        if (hasSurface) {
            initCamera(surfaceHolder);
        } else {
            surfaceHolder.addCallback(this);
            surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        }
        decodeFormats = null;
        characterSet = null;

        playBeep = true;
        AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
        if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
            playBeep = false;
        }
        initBeepSound();
        vibrate = true;

        //quit the scan view
//		cancelScanButton.setOnClickListener(new OnClickListener() {
//
//			@Override
//			public void onClick(View v) {
//				CaptureActivity.this.finish();
//			}
//		});
    }
 

@SuppressWarnings("deprecation")
public VideoViewRecycler(Context context, AttributeSet attrs) {
    super(context, attrs);

    SurfaceHolder holder = getHolder();
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

    mContext = context;
}
 

private void initView ( Context ctx , BubbleGraphVO vo )
{
	ErrorCode ec = ErrorDetector.checkGraphObject(vo);
	ec.printError();
	
	SurfaceHolder holder = this.getHolder();
	holder.addCallback(this);
	mContext = ctx;
}
 

private void initPaint() {
    SurfaceHolder holder = getHolder();
    holder.addCallback(this);
    holder.setFormat(PixelFormat.TRANSPARENT);
    setZOrderOnTop(true);

    linePaint.setAntiAlias(true);
    linePaint.setColor(0xff05225C);
    linePaint.setStyle(Paint.Style.STROKE);
    linePaint.setStrokeCap(Paint.Cap.ROUND);
    linePaint.setStrokeWidth(20);

}
 

@Override
protected void onResume() {
    super.onResume();

    // CameraManager必须在这里初始化，而不是在onCreate()中。
    // 这是必须的，因为当我们第一次进入时需要显示帮助页，我们并不想打开Camera,测量屏幕大小
    // 当扫描框的尺寸不正确时会出现bug
    cameraManager = new CameraManager(getApplication());

    viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
    viewfinderView.setCameraManager(cameraManager);

    handler = null;

    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
        // activity在paused时但不会stopped,因此surface仍旧存在；
        // surfaceCreated()不会调用，因此在这里初始化camera
        initCamera(surfaceHolder);
    } else {
        // 重置callback，等待surfaceCreated()来初始化camera
        surfaceHolder.addCallback(this);
    }

    beepManager.updatePrefs();
    inactivityTimer.onResume();

    source = IntentSource.NONE;
    decodeFormats = null;
    characterSet = null;
}
 

private void init()
{
   // Install a SurfaceHolder.Callback so we get notified when the
   // underlying surface is created and destroyed
   SurfaceHolder holder = getHolder();
   holder.addCallback(this);
}
 

private void init(@SuppressWarnings("UnusedParameters") Context context) {
	SurfaceHolder holder = getHolder();
	holder.addCallback(this);
	holder.setFormat(PixelFormat.RGBA_8888);
	setKeepScreenOn(true);
	mainThreadHandler = new Handler(Looper.getMainLooper());
}
 

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Check for the camera permission before accessing the camera.  If the
    // permission is not granted yet, request permission.
    SurfaceHolder holder = mView.getHolder();
    holder.addCallback(this);
    holder.setFormat(ImageFormat.NV21);
}
 

@Override
protected void onResume() {
	super.onResume();
	SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
	SurfaceHolder surfaceHolder = surfaceView.getHolder();
	if (hasSurface) {
		initCamera(surfaceHolder);
	} else {
		surfaceHolder.addCallback(this);
		surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
	}
	decodeFormats = null;
	characterSet = null;

	playBeep = true;
	AudioManager audioService = (AudioManager) getSystemService(AUDIO_SERVICE);
	if (audioService.getRingerMode() != AudioManager.RINGER_MODE_NORMAL) {
		playBeep = false;
	}
	initBeepSound();
	vibrate = true;
	
	//quit the scan view
	cancelScanButton.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View v) {
			CaptureActivity.this.finish();
		}
	});
}
 

private void init(Context context) {
	mContext = context;
    SurfaceHolder holder = getHolder();
    holder.addCallback(this);
    //thread = new MjpegViewThread(holder, context);
    setFocusable(true);
    
    mPlayer = new MjpegPlayer(holder, mContext, mIn);
    mPlayer.setDisplay(getWidth(), getHeight(), MjpegView.SIZE_BEST_FIT);
    mIsPrepared = true;
    attachMediaController();
    mPlayer.showFps(true);
}
 

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        setSupportActionBar(mToolbar);

        mPermissionsChecker = new PermissionsChecker(this);

        streamer = new EvilsLiveStreamer(this);

//        ViewGroup.LayoutParams layoutParams = mPreviewView.getLayoutParams();
//        layoutParams.width = 640;
//        layoutParams.height = 480;
//        mPreviewView.setLayoutParams(layoutParams);
        SurfaceHolder holder = mPreviewView.getHolder();
        holder.addCallback(this);

        audioCapture = new AudioCapture();
        audioPlay = new AudioPlayer();

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, mToolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        ActivityComponent activityComponent = DaggerActivityComponent.builder()
                .activityModule(new ActivityModule(this)).build();
        activityComponent.getActivity();

//        CameraComponent cameraComponent = DaggerCameraComponent.builder().activityComponent(activityComponent).
//                cameraModule(new com.thinkkeep.videolib.di.modules.CameraModule(this)).build();
//        cameraComponent.inject(this);
    }
 

@SuppressWarnings("deprecation")
@Override
protected void onResume() {
    super.onResume();

    // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't
    // want to open the camera driver and measure the screen size if we're going to show the help on
    // first launch. That led to bugs where the scanning rectangle was the wrong size and partially
    // off screen.
    cameraManager = new CameraManager(getApplication());

    viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
    viewfinderView.setCameraManager(cameraManager);

    statusView = (TextView) findViewById(R.id.status_view);

    handler = null;

    resetStatusView();

    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
        // The activity was paused but not stopped, so the surface still exists. Therefore
        // surfaceCreated() won't be called, so init the camera here.
        initCamera(surfaceHolder);
    } else {
        // Install the callback and wait for surfaceCreated() to init the camera.
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    ambientLightManager.start(cameraManager);

    inactivityTimer.onResume();

    Intent intent = getIntent();

    decodeFormats = null;
    characterSet = null;

    if (intent != null) {

        String action = intent.getAction();

        if (Intents.Scan.ACTION.equals(action)) {

            // Scan the formats the intent requested, and return the result to the calling activity.
            decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);
            decodeHints = DecodeHintManager.parseDecodeHints(intent);

            if (intent.hasExtra(Intents.Scan.WIDTH) && intent.hasExtra(Intents.Scan.HEIGHT)) {
                int width = intent.getIntExtra(Intents.Scan.WIDTH, 0);
                int height = intent.getIntExtra(Intents.Scan.HEIGHT, 0);
                if (width > 0 && height > 0) {
                    cameraManager.setManualFramingRect(width, height);
                }
            }

            String customPromptMessage = intent.getStringExtra(Intents.Scan.PROMPT_MESSAGE);
            if (customPromptMessage != null) {
                statusView.setText(customPromptMessage);
            }

        }

        characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);

    }
}
 

public EglSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    //获取surfaceHolder预览对象
    SurfaceHolder surfaceHolder = getHolder();
    surfaceHolder.addCallback(this);
}
 

@Override
public void initRender() {
    SurfaceHolder holder = mSurfaceView.getHolder();
    holder.addCallback(this);
    mIsRenderValid = !holder.isCreating();
}
 

@Override
protected void onResume() {
	super.onResume();

	// CameraManager must be initialized here, not in onCreate(). This is
	// necessary because we don't
	// want to open the camera driver and measure the screen size if we're
	// going to show the help on
	// first launch. That led to bugs where the scanning rectangle was the
	// wrong size and partially
	// off screen.

	// 相机初始化的动作需要开启相机并测量屏幕大小，这些操作
	// 不建议放到onCreate中，因为如果在onCreate中加上首次启动展示帮助信息的代码的 话，
	// 会导致扫描窗口的尺寸计算有误的bug
	cameraManager = new CameraManager(getApplication());

	viewfinderView = (ViewfinderView) findViewById(R.id.capture_viewfinder_view);
	viewfinderView.setCameraManager(cameraManager);

	handler = null;
	lastResult = null;

	// 摄像头预览功能必须借助SurfaceView，因此也需要在一开始对其进行初始化
	// 如果需要了解SurfaceView的原理
	// 参考:http://blog.csdn.net/luoshengyang/article/details/8661317
	SurfaceView surfaceView = (SurfaceView) findViewById(R.id.capture_preview_view); // 预览
	SurfaceHolder surfaceHolder = surfaceView.getHolder();
	if (hasSurface) {
		// The activity was paused but not stopped, so the surface still
		// exists. Therefore
		// surfaceCreated() won't be called, so init the camera here.
		initCamera(surfaceHolder);

	}
	else {
		// 防止sdk8的设备初始化预览异常
		surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

		// Install the callback and wait for surfaceCreated() to init the
		// camera.
		surfaceHolder.addCallback(this);
	}

	// 加载声音配置，其实在BeemManager的构造器中也会调用该方法，即在onCreate的时候会调用一次
	beepManager.updatePrefs();

	// 启动闪光灯调节器
	ambientLightManager.start(cameraManager);

	// 恢复活动监控器
	inactivityTimer.onResume();

	source = IntentSource.NONE;
	decodeFormats = null;
	characterSet = null;
}