0
我正在檢查，如果我的surfaceView項目工作正常，所以我已經嘗試過我的妻子銀河s7 G930F，它工作得很好，當我嘗試過使用我的HTC ONE M9，它甚至沒有動，一直崩潰。這是在Android 6.奇怪的問題，兩個手機的運行速度雖然試圖運行我是連接日誌：致命的例外 - Camera.release（）被調用後，相機正在使用HTC ONE M9
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.arturs.androidmirrorapplicationv2, PID: 15974
java.lang.RuntimeException: Camera is being used after Camera.release() was called
at android.hardware.Camera.setPreviewSurface(Native Method)
at android.hardware.Camera.setPreviewDisplay(Camera.java:923)
at com.example.arturs.androidmirrorapplicationv2.CameraView.surfaceCreated(CameraView.java:46)
at android.view.SurfaceView.updateWindow(SurfaceView.java:582)
at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:177)
at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2152)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1174)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6241)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:873)
at android.view.Choreographer.doCallbacks(Choreographer.java:676)
at android.view.Choreographer.doFrame(Choreographer.java:606)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:859)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:168)
Disconnected from the target VM, address: 'localhost:8602', transport: 'socket'
at android.app.ActivityThread.main(ActivityThread.java:5845)
at java.lang.reflect.Method.invoke(Native Method)
和我的代碼的其餘部分看起來像上面：MainActivity類別
import android.content.pm.PackageManager;
import android.hardware.Camera;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
public class MainActivity extends AppCompatActivity {
private Camera mCamera;
private CameraView mCameraView;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onResume(){
super.onResume();
try{
if (ContextCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED)
//pyta użytkownika o autoryzację - potrzebne w androidzie => 6.0 tzw. run permission
ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.CAMERA}, 50);
else
mCamera = openFrontFacingCamera();
mCameraView = new CameraView(this, mCamera);
setContentView(mCameraView);
} catch (Exception e){
finish();
}
}
@Override
protected void onPause(){
if(mCamera != null){
mCamera.release();
mCamera = null;
}
super.onPause();
}
public Camera openFrontFacingCamera() {
int cameraCount = 0;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
try {
cam = Camera.open(camIdx);
} catch (RuntimeException e) {
Log.e(TAG, "Camera failed to open: " + e.getLocalizedMessage());
}
}
}
return cam;
}
}
CameraView類
import android.content.Context;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.Surface;
import android.view.Display;
import android.view.WindowManager;
import java.io.IOException;
import java.util.List;
public class CameraView extends SurfaceView implements SurfaceHolder.Callback{
private Camera mCamera;
private View mView;
private WindowManager display;
private Context mContext;
private static final String cameraPreview = "CameraView";
private static final String APP_CLASS = "APP_CLASS";
private static final String Bug = "Bug";
public CameraView(Context context, Camera mCamera) {
super(context);
mContext = context;
this.mCamera = mCamera;
mCamera.setDisplayOrientation(90);
SurfaceHolder holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try{
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (IOException e) {
Log.e(cameraPreview, "The failure of the camera settings");
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters params = mCamera.getParameters();
List<Camera.Size> sizes = params.getSupportedPreviewSizes();
Camera.Size optionalSize = getOptimalPreviewSize(sizes, width, height);
params.setPreviewSize(optionalSize.width, optionalSize.height);
mCamera.setParameters(params);
boolean isPreviewRunning = true;
if (isPreviewRunning)
{
mCamera.stopPreview();
}
Parameters parameters = mCamera.getParameters();
Display display = ((WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay();
width = display.getWidth();
height = display.getHeight();
if(display.getRotation() == Surface.ROTATION_0)
{
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(90);
}
if(display.getRotation() == Surface.ROTATION_90)
{
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(0);
}
if(display.getRotation() == Surface.ROTATION_180)
{
parameters.setPreviewSize(height, width);
mCamera.setDisplayOrientation(270);
}
if(display.getRotation() == Surface.ROTATION_270)
{
parameters.setPreviewSize(width, height);
mCamera.setDisplayOrientation(180);
}
try{
mCamera.setParameters(parameters);
previewCamera(holder);
mCamera.startPreview();}
catch(Exception e){
Log.e(Bug, "setting Parameters Failed" + e.getLocalizedMessage());
}
}
public void previewCamera(SurfaceHolder holder)
{
try
{
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
boolean isPreviewRunning = true;
}
catch(Exception e)
{
Log.d(APP_CLASS, "Cannot start preview", e);
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.release();
mCamera = null;
}
private Camera.Size getOptimalPreviewSize(List<Camera.Size> sizes, int w, int h) {
final double ASPECT_TOLERANCE = 0.1;
double targetRatio=(double)h/w;
if (sizes == null) return null;
Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.width/size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - targetHeight) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - targetHeight);
}
}
}
return optimalSize;
}
}
我會感謝所有類型的建議，這可以讓我解決這個問題。