我在使用最新Camera API的Android开发的SurfaceView类上遇到了麻烦。我已经仔细检查过我的最低API级别是21。
我已经通过两种方式解决了这个问题，一种是在XML中创建SurfaceView，然后将其值赋予我的私有SurfaceView或使用公共构造函数创建它。
使用SurfaceView，我可以使用getHolder（）获取SurfaceHolder，然后使用getSurface（）获取Surface。
在我发布的代码中，我只是使用公共构造函数创建它。
此SurfaceView应该使用createCaptureSession()
放置相机的预览这是我的代码，是我在昨天与另一个项目一起尝试后尝试的快速类实现。检查MainActivity的onCreate（）和onOpened（），其中使用了SurfaceView。
package com.example.universitywork.canyouwork;
/* IMPORTS */
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback {
// CREAMOS CLASES
private CameraManager mManager;
private CameraDevice cDevice;
private CaptureRequest cRequest;
private Handler handle = new Handler();
private SurfaceView surface;
private SurfaceHolder holder;
private Surface under;
private final CameraDevice.StateCallback mCallbackDevice = new CameraDevice.StateCallback() {
@Override
public void onOpened(CameraDevice camera) {
cDevice = camera;
try {
camera.createCaptureSession(Arrays.asList(under), mCallbackSession, handle);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onDisconnected(CameraDevice camera) {
System.out.println("ONDC");
}
@Override
public void onError(CameraDevice camera, int error) {
System.out.println("ONerror");
}
};
private final CameraCaptureSession.CaptureCallback mCaptureCallback = new CameraCaptureSession.CaptureCallback() {
};
private final CameraCaptureSession.StateCallback mCallbackSession = new CameraCaptureSession.StateCallback() {
@Override
public void onConfigured(CameraCaptureSession session) {
try {
System.out.println("LLEGO AQUI");
cRequest = cDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW).build();
// session.capture(cRequest, mCaptureCallback, handle);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void onConfigureFailed(CameraCaptureSession session) {
System.out.println("ONCONFIGUREFAILED");
}
};
public MainActivity() {
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
surface= new SurfaceView(this);
holder = surface.getHolder();
holder.addCallback(this);
holder.setFixedSize(500,500);
under= holder.getSurface();
mManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
String id = getId(mManager);
try {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
mManager.openCamera(id, mCallbackDevice, handle);
} catch (CameraAccessException e) {
e.printStackTrace();
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
System.out.println("ONCHANGED");
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
System.out.println("ONDESTROYED");
}
public String getId (CameraManager manager) {
try {
for (String cameraId : manager.getCameraIdList()) {
CameraCharacteristics characteristics = manager.getCameraCharacteristics(cameraId);
int orientation = characteristics.get(CameraCharacteristics.LENS_FACING);
if (orientation == CameraCharacteristics.LENS_FACING_FRONT) return cameraId;
}
} catch (CameraAccessException e) {
e.printStackTrace();
}
return "NULL";
}}
快进到错误：
E/Legacy-CameraDevice-JNI: getNativeWindow: Surface had no valid native window.
E/Legacy-CameraDevice-JNI: LegacyCameraDevice_nativeDetectSurfaceDimens: Could not retrieve native window from surface.
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.universitywork.canyouwork, PID: 4885
java.lang.IllegalArgumentException: Surface was abandoned
at android.hardware.camera2.utils.SurfaceUtils.getSurfaceSize(SurfaceUtils.java:70)
at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:97)
at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:71)
at android.hardware.camera2.impl.CameraDeviceImpl.createCaptureSession(CameraDeviceImpl.java:474)
at com.example.universitywork.canyouwork.MainActivity$1.onOpened(MainActivity.java:40)
at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:134)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.hardware.camera2.legacy.LegacyExceptionUtils$BufferQueueAbandonedException
at android.hardware.camera2.legacy.LegacyExceptionUtils.throwOnError(LegacyExceptionUtils.java:64)
at android.hardware.camera2.legacy.LegacyCameraDevice.getSurfaceSize(LegacyCameraDevice.java:540)
at android.hardware.camera2.utils.SurfaceUtils.getSurfaceSize(SurfaceUtils.java:68)
at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:97)
at android.hardware.camera2.params.OutputConfiguration.<init>(OutputConfiguration.java:71)
at android.hardware.camera2.impl.CameraDeviceImpl.createCaptureSession(CameraDeviceImpl.java:474)
at com.example.universitywork.canyouwork.MainActivity$1.onOpened(MainActivity.java:40)
at android.hardware.camera2.impl.CameraDeviceImpl$1.run(CameraDeviceImpl.java:134)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
我认为它与SurfaceView的大小或底层表面有关。也许我没有正确使用它，但Android文档说它可以使用SurfaceView。
答案 0 :(得分：3)
经过几天和不眠之夜的camera2 api战斗之后，我得出的结论是文档甚至样本都不是很清晰，或者说，我的学习速度很慢。当我看到很多人都在与api进行斗争时，对我感到安慰的是，对所提出问题的答复不一定提供解决方案和简单答案。
我试图拍两张照片-一张一张接一张。即使使用finish（）关闭Intent并重新打开它也没有提供解决方案-我根本无法在不重新启动整个应用程序的情况下拍摄第二张照片。在第二张图片中，API继续失败，并出现以下问题：-
Fatal Exception: java.lang.IllegalArgumentException Surface had no valid native Surface.
android.hardware.camera2.legacy.LegacyCameraDevice.nativeGetSurfaceId (LegacyCameraDevice.java)
android.hardware.camera2.legacy.LegacyCameraDevice.getSurfaceId (LegacyCameraDevice.java:658)
android.hardware.camera2.legacy.LegacyCameraDevice.containsSurfaceId (LegacyCameraDevice.java:678)
这些代码行提供了线索和我的突破：-
ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
outputSurfaces.add(reader.getSurface());
outputSurfaces.add(new Surface(textureView.getSurfaceTexture()));
我们检索位图并将其保存到文件中，如下所示：-
image = reader.acquireLatestImage();
ByteBuffer buffer = image.getPlanes()[0].getBuffer();
byte[] bytes = new byte[buffer.capacity()];
buffer.get(bytes);
然后终于：-
if (image != null) {
image.close();
}
被许多人忽视：-
ImageReader reader = ImageReader.newInstance(width, height, ImageFormat.JPEG, 1);
由于某种原因，它仍然作为实例运行，并且将继续执行直到关闭。它不会随GC一起回收，并且在关闭类时也不会被销毁。您还应该手动关闭阅读器：-
if (image != null) {
image.close();
}
if(reader != null) {
reader.close();
}
它可以解决我所有的camera2问题，我确定只能等到下一次。希望这也对其他人有所帮助！
答案 1 :(得分：1)
经过几个小时后，我意识到我只需要到达SurfaceCreated（）并且我没有达到它，解决方法是在onCreate（）中没有openCamera。
答案 2 :(得分：1)
创建SurfaceView后，您只需调用“ openCamera”功能
将此代码放入onCreate（此代码用于kotlin）
mySurfaceView!!.holder!!.addCallback(object: SurfaceHolder.Callback {
override fun surfaceChanged(holder: SurfaceHolder, format: Int,
width: Int, height: Int) {
}
override fun surfaceCreated(holder: SurfaceHolder) {
openCamera()
}
override fun surfaceDestroyed(holder: SurfaceHolder) {
}
})
答案 3 :(得分：0)
private static Size chooseOptimalSize(Size[] choices, int width, int height) {
Size bigEnough = null;
int minAreaDiff = Integer.MAX_VALUE;
for (Size option : choices) {
int diff = (width*height)-(option.getWidth()*option.getHeight()) ;
if (diff >=0 && diff < minAreaDiff &&
option.getWidth() <= width &&
option.getHeight() <= height) {
minAreaDiff = diff;
bigEnough = option;
}
}
if (bigEnough != null) {
return bigEnough;
} else {
Arrays.sort(choices,new CompareSizeByArea());
return choices[0];
}
}