我一直在使用具有拍照相机活动的应用。正常的行为是拍照，将其作为意图发送，然后关闭此活动，但在三星设备上，这只是关闭重新启动应用程序。我在仿真器和华硕平板电脑上进行了测试，它运行良好。我也在多个操作系统版本上进行了测试，但我没有看到任何区别。有问题的三星设备有：S4，S2和Note。
以下是相机活动：
package app.xqute.com.xqute.ui;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.hardware.Camera;
import android.os.Bundle;
import android.view.Display;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageButton;
import java.io.IOException;
import java.util.List;
import app.xqute.com.xqute.R;
import butterknife.ButterKnife;
import butterknife.InjectView;
import butterknife.OnClick;
import timber.log.Timber;
/**
* Created by mbarisa on 5/21/15.
*/
public class CameraActivity extends Activity {
@InjectView(R.id.cameraPreview)
FrameLayout mCameraPreview;
@InjectView(R.id.btnCapture)
ImageButton mBtnCapture;
private Camera mCamera;
private CameraPreview mPreview;
private int midScreenHeight, midScreenWidth;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
ButterKnife.inject(this);
mCamera = getCameraInstance();
// Create the Camera preview view
mPreview = new CameraPreview(this, mCamera);
mCameraPreview.addView(mPreview);
Display display = getWindowManager().getDefaultDisplay();
midScreenHeight = display.getHeight() / 2;
midScreenWidth = display.getWidth() / 2;
// TODO: remove this and enable faceDetectionListener
mBtnCapture.setVisibility(View.VISIBLE);
}
@OnClick(R.id.btnCapture)
void capture() {
// mCamera.setFaceDetectionListener(faceDetectionListener);
mCamera.takePicture(() -> {
}, null, mPicture);
}
final Camera.PictureCallback mPicture = (data, camera) -> {
System.out.println("data = " + data.length);
Intent intent = new Intent();
intent.putExtra("data", data);
setResult(RESULT_OK, intent);
finish();
};
final Camera.FaceDetectionListener faceDetectionListener = (faces, camera) -> {
try {
Timber.v("face: " + faces[0].rect.centerX() + " | " + faces[0].rect.centerY());
int posX = midScreenWidth - faces[0].rect.centerX();
int posY = midScreenHeight + faces[0].rect.centerY();
mBtnCapture.setVisibility(View.VISIBLE);
System.out.println("posY = " + posY);
System.out.println("posX = " + posX);
} catch (ArrayIndexOutOfBoundsException e) {
mBtnCapture.setVisibility(View.GONE);
}
};
@Override
protected void onPause() {
super.onPause();
finish();
mPreview.stopPreview();
}
/**
* A safe way to get an instance of the Camera object.
* <p>
* Returns null if camera is unavailable
*/
private static Camera getCameraInstance() {
Camera c = null;
try {
c = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
} catch (Exception ignore) {
// Camera is not available (in use or does not exist). Do nothing.
}
return c;
}
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Camera mCamera;
private List<Camera.Size> mSupportedPreviewSizes;
private Camera.Size mPreviewSize;
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);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, now tell the camera where to draw the preview
try {
if (mCamera != null) {
mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
// mCamera.setFaceDetectionListener(faceDetectionListener);
// mCamera.startFaceDetection();
}
} catch (IOException e) {
// Do nothing
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
if (mCamera != null) {
mCamera.stopPreview();
}
}
private void stopPreview() {
if (mCamera != null) {
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}
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 ignore) {
// Tried to stop a non-existent preview. Do nothing.
}
try {
// Set preview size and make any resize, rotate or reformatting changes here
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
mCamera.setParameters(parameters);
mCamera.startPreview();
} catch (Exception ignored) {
}
// Start preview with new settings
try {
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception ignore) {
// Do nothing
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
setMeasuredDimension(width, height);
if (mSupportedPreviewSizes != null) {
mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
}
}
}
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;
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 - h) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - h);
}
}
if (optimalSize == null) {
minDiff = Double.MAX_VALUE;
for (Camera.Size size : sizes) {
if (Math.abs(size.height - h) < minDiff) {
optimalSize = size;
minDiff = Math.abs(size.height - h);
}
}
}
return optimalSize;
}
}
为什么会发生这种情况？或者也许是一种修复或避免这种情况的方法？