Java-旋转180度android无法正常工作
作者:互联网
这个问题已经在这里有了答案: > Rotating phone quickly 180 degrees, camera preview turns upside down 2个
如果我将“左侧基准”更改为“右侧基准”(均为用户的横向视图模式),则不会重新创建应用程序(活动).诚然,相机显示为水平翻转图像.当我尝试为两种纵向模式(正常和反向)更改设备位置时,结果相同.设备正常检测到90度旋转.即,左侧=>画像=>正确大小=>反像=>左侧正常工作!
有可能解决这个问题吗?
我正在使用Android 4.4.4.
码:
Display display = ((WindowManager)context.getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0){//0
mCamera.setDisplayOrientation(90);
}else if(display.getRotation() == Surface.ROTATION_90){//1
mCamera.setDisplayOrientation(0);
}else if(display.getRotation() == Surface.ROTATION_180){//2
mCamera.setDisplayOrientation(270);
}else if(display.getRotation() == Surface.ROTATION_270){//3
mCamera.setDisplayOrientation(180);
}
Log.d(TAG, "ROTATION:" + display.getRotation() + " ");
编辑
我的意思是,当我将设备旋转180度时,永远不会调用onResume()和SurfaceCreate().
编辑功能代码
SurfaceView sfv;
FrameLayout fl0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//some code to initialize
fl0 = (FrameLayout) findViewById(R.id.fl0);
sfv = new SurfaceView(this);
fl0.addView(sfv,0);
addSurfaceHolder();
}
private void addSurfaceHolder(){
SurfaceHolder holder = sfv.getHolder();
holder.addCallback(new SurfaceHolder.Callback() {
@Override
public void surfaceCreated(SurfaceHolder holder) {
Log.d(TAG,TAG + " surfaceCreated");
//this function never calls for 180 deg rotation.
cameraStart(MainActivity.this,false);
//some code for camera holder connection
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
Log.d(TAG,TAG + " surfaceChanged");
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
///Some code to destroy camera
Log.d(TAG,TAG + " surfaceDestroyed");
}
});
}
@Override
protected void onResume() {
super.onResume();
Log.d(TAG,TAG + " onResume");//call for 90 deg rotation. not for 180 deg rotation.
}
public static void cameraStart(Context context, boolean startStopPreview){
if (mCamera == null)
{
mCamera = Camera.open(CAMERA_ID);//0
}
Camera.Parameters cameraParam = mCamera.getParameters();
Camera.Size previewSize = cameraParam.getPreviewSize();
previewFormat = cameraParam.getPreviewFormat();
frameWidth = previewSize.width;
frameHeight = previewSize.height;
frameRect = new Rect(0, 0, frameWidth, frameHeight);
Display display = ((WindowManager)context.getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation() == Surface.ROTATION_0){//0
mCamera.setDisplayOrientation(90);
}else if(display.getRotation() == Surface.ROTATION_90){//1
mCamera.setDisplayOrientation(0);
}else if(display.getRotation() == Surface.ROTATION_180){//2
mCamera.setDisplayOrientation(270);
}else if(display.getRotation() == Surface.ROTATION_270){//3
mCamera.setDisplayOrientation(180);
}
Log.d(TAG, "ROTATION:" + display.getRotation() + " ");//just calles for 90 deg rotation. not for 180 deg.
}
解决方法:
您需要获取相机的支持参数,如下所示:
Camera.Parameters parameters = camera.getParameters();
并在mCamera.setDisplayOrientation(int);之前添加此行;
parameters.setRotation(int);
例如:
if(display.getRotation() == Surface.ROTATION_0){//0
parameters.setRotation(90);
mCamera.setDisplayOrientation(90);
}else if(display.getRotation() == Surface.ROTATION_90){//1
parameters.setRotation(0);
mCamera.setDisplayOrientation(0);
}else if(display.getRotation() == Surface.ROTATION_180){//2
parameters.setRotation(270);
mCamera.setDisplayOrientation(270);
}else if(display.getRotation() == Surface.ROTATION_270){//3
parameters.setRotation(180);
mCamera.setDisplayOrientation(180);
}
希望这能回答您的问题
编辑
上面的代码也需要出现在onResume()方法中,因为每次更改方向时都会调用onDestroy(),然后调用onCreate(),因此onResume()需要具有这段代码以及onCreate().
编辑2
更多内容请看this问题,以获取有关OrientationEventListener的提示
希望您会发现此答案有用.
标签:android-camera,java,android 来源: https://codeday.me/bug/20191120/2047542.html