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[英]How to show Front Camera Preview on Framelayout using Camera2 in Android?
[英]Android Camera preview issue with FrameLayout
这是我的XML文件。 我采用一个LinearLayout,其中我采用SurfaceView和Button,但相机显示的视图如下图所示……请看一下Image,请给我解决方案。
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<SurfaceView
android:layout_height="match_parent"
android:layout_width="match_parent"
android:id="@+id/surface"
android:layout_weight="2"/>
<Button
android:layout_height="100dp"
android:layout_width="match_parent"
android:id="@+id/click"
android:text="Click Photo"
android:layout_weight="1"/>
</LinearLayout>
这是我的Java代码,请同时检查
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clickphotobtn=(Button)findViewById(R.id.click);
surfaceview=(SurfaceView)findViewById(R.id.surface);
surfaceholder=surfaceview.getHolder();
surfaceholder.addCallback(this);
surfaceholder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
clickphotobtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//startActivity(intent);
camera.takePicture(null, null, null);
}
});
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
camera = Camera.open();
camera.setPreviewDisplay(surfaceholder);
// Toast.makeText(getApplication(), "Create", Toast.LENGTH_LONG).show();
} catch (IOException e) { }
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height)
{
Camera.Parameters parameters = camera.getParameters();
Display display = ((WindowManager)getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
if(display.getRotation()== Surface.ROTATION_0)
{
parameters.setPreviewSize(width, height);
camera.setDisplayOrientation(90);
}
if(display.getRotation()== Surface.ROTATION_90 || display.getRotation()== Surface.ROTATION_180)
parameters.setPreviewSize(width, height);
if(display.getRotation()==Surface.ROTATION_270)
{
parameters.setPreviewSize(width, height);
camera.setDisplayOrientation(180);
}
// camera.setParameters(parameters);
try{
camera.setPreviewDisplay(surfaceholder);
camera.startPreview();
}
catch (Exception e){
Toast.makeText(getApplication(), e.toString(), Toast.LENGTH_LONG).show();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
if (null == camera)
return;
camera.stopPreview();
camera.release();
camera = null;
preview = false;
//Toast.makeText(getApplication(), "Destroy", Toast.LENGTH_LONG).show();
}
这是更改相机方向的正确方法,这段代码对我有用。 camera.setDisplayOrientation(90);
尝试遵循文档建议的方法,使用Camera.CameraInfo来获取相机方向并随后对其进行更新。
在此处查看示例: void setDisplayOrientation(int) 。
添加公共类YourActivity扩展AppCompatActivity实现SurfaceHolder.Callback {....}
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