如何在 Android 中将帧布局中的视频显示为纵向模式?

Question

当我启动应用程序时，我需要打开后置摄像头并显示视频。我正在使用FrameLayout。我可以打开相机并显示视频。但是即使我将屏幕方向设置为纵向，视频也会以横向模式显示。下面是代码。

主要活动.java ：

public class MainActivity extends AppCompatActivity {
private static final String TAG = "MainActivity";
private static final int VIDEO_CAPTURE = 1;
private static final int MY_CAMERA_REQUEST_CODE = 100;
private Camera mCamera;
private CameraPreview mPreview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MainActivity.this.setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); // NOT WORKING ------------------------------
setContentView(R.layout.activity_main);
TextView wifiTextView = (TextView) findViewById(R.id.wifi_text);
WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
WifiInfo wifiInfo = wifiManager.getConnectionInfo();
int rssi = wifiManager.getConnectionInfo().getRssi();
wifiTextView.setTextColor(Color.WHITE);
wifiTextView.setText(Integer.toString(rssi));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (checkSelfPermission(Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
Log.d(TAG, "No camera permission");
requestPermissions(new String[]{Manifest.permission.CAMERA}, MY_CAMERA_REQUEST_CODE);
}
else {
Log.d(TAG, "camera permission");
mCamera = getCameraInstance();
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
}
else {
Log.d(TAG, "Use camera in OnCreate");
mCamera = getCameraInstance();
mPreview = new CameraPreview(this, mCamera);
FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
preview.addView(mPreview);
}
}
public static Camera getCameraInstance(){
Camera c = null;
try {
c = Camera.open(); // attempt to get a Camera instance
}
catch (Exception e){
// Camera is not available (in use or does not exist)
}
return c; // returns null if camera is unavailable
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == MY_CAMERA_REQUEST_CODE) {
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
}
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
// NOT COMING HERE -------------------------------------------------------
if(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Log.d(TAG, "COnfiguration LANDSCAPE");
}
else if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
Log.d(TAG, "COnfiguration PORTRAIT");
}
else {
Log.d(TAG, "Default code");
}
}
}

相机预览.java ：

/** A basic Camera preview class */
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "CameraPreview";
private SurfaceHolder mHolder;
private Camera mCamera;
public CameraPreview(Context context, Camera camera) {
super(context);
mCamera = camera;
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
// deprecated setting, but required on Android versions prior to 3.0
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview.
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.d(TAG, "Error setting camera preview: " + e.getMessage());
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// empty. Take care of releasing the Camera preview in your activity.
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// If your preview can change or rotate, take care of those events here.
// Make sure to stop the preview before resizing or reformatting it.
if (mHolder.getSurface() == null){
// preview surface does not exist
return;
}
// stop preview before making changes
try {
mCamera.stopPreview();
} catch (Exception e){
// ignore: tried to stop a non-existent preview
}
// set preview size and make any resize, rotate or
// reformatting changes here
// start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}
}

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity"
android:screenOrientation="portrait"
android:configChanges="keyboardHidden">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>

布局：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="@+id/camera_preview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:screenOrientation="portrait"
android:layout_weight="1" />
<TextView
android:id="@+id/wifi_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

我将MainActitivity的屏幕方向设置为清单中的PORTRAIT，将FrameLayout的屏幕方向设置为布局中的PORTRAIT。静止视频以横向模式显示。任何人都可以让我知道如何以编程方式以纵向模式显示视频。

Answer 1

请在构造函数方法中添加mCamera.setDisplayOrientation(90);CameraPreview(Context context, Camera camera)然后尝试。

setDisplayOrientation(int)方法按顺时针方向设置值，并且 有效值为 0、90、180 和 270。

为了设置输出视频的方向，请在创建MediaRecorder实例后添加mediaRecorder.setOrientationHint(90);，如下所示

mediaRecorder = new MediaRecorder();
mediaRecorder.setOrientationHint(90);

setOrientationHint(( 将设置输出(录制(视频的旋转角度。

欲了解更多信息，请参阅以下链接

1.设置显示方向(整数(

https://developer.android.com/reference/android/hardware/Camera#setDisplayOrientation(int(在此处输入链接说明

2.设置方向提示(int(

https://developer.android.com/reference/android/media/MediaRecorder#setOrientationHint(整型(