我的相机在我的应用程序中遇到问题，并且在运行应用程序时它不是全屏。我有一个相机的屏幕截图，我稍后会发布。主要活动类从相机预览类中获取其屏幕大小，因此即使我有相应的布局（将相机托管在其上），我也不会发布其代码。
CameraPreview.java
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
public static final int MEDIA_TYPE_IMAGE = 1;
private static final String TAG = "CameraPreview";
private SurfaceHolder mSurfaceHolder;
private Context mContext;
private SurfaceHolder mHolder;
private Camera mCamera;
private List<Camera.Size> mSupportedPreviewSizes;
private Camera.Size mPreviewSize;
private OnFocusChangeListener onFocusListener;
private boolean needToTakePic = false;
private boolean isLightOn = false;
public CameraPreview(Context context, Camera camera) {
super(context);
mContext = context;
mCamera = camera;
Camera.Parameters params = camera.getParameters();
this.mCamera = camera;
this.mSurfaceHolder = this.getHolder();
this.mSurfaceHolder.addCallback(this);
this.mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
// supported preview sizes
mSupportedPreviewSizes = mCamera.getParameters().getSupportedPreviewSizes();
for(Camera.Size str: mSupportedPreviewSizes)
Log.e(TAG, str.width + "/" + str.height);
// 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) {
try {
mCamera.setPreviewDisplay(holder);
mCamera.getParameters().setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.setDisplayOrientation(90);
mCamera.startPreview();
} catch (IOException e) {
// left blank for now
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
this.mSurfaceHolder.removeCallback(this);
mCamera.release();
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.e(TAG, "surfaceChanged => w=" + w + ", h=" + 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
}
try {
mCamera.setPreviewDisplay(holder);
mCamera.startPreview();
} catch (Exception e) {
// intentionally left blank for a test
e.printStackTrace();
}
// set preview size and make any resize, rotate or reformatting changes here
// start preview with new settings
try {
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPreviewSize(mPreviewSize.width, mPreviewSize.height);
mCamera.setParameters(parameters);
mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(mHolder);
mCamera.startPreview();
} catch (Exception e){
Log.d(TAG, "Error starting camera preview: " + e.getMessage());
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int width = resolveSize(getSuggestedMinimumWidth(), widthMeasureSpec);
final int height = resolveSize(getSuggestedMinimumHeight(), heightMeasureSpec);
if (mSupportedPreviewSizes != null) {
mPreviewSize = getOptimalPreviewSize(mSupportedPreviewSizes, width, height);
}
float ratio;
if(mPreviewSize.height >= mPreviewSize.width)
ratio = (float) mPreviewSize.height / (float) mPreviewSize.width;
else
ratio = (float) mPreviewSize.width / (float) mPreviewSize.height;
// One of these methods should be used, second method squishes preview slightly
setMeasuredDimension(width, (int) (width * ratio));
// setMeasuredDimension((int) (width * ratio), 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;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.height / size.width;
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;
}
private Camera.AutoFocusCallback myAutoFocusCallback = new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean arg0, Camera arg1) {
if (arg0) {
mCamera.cancelAutoFocus();
}
}
};
public void doTouchFocus(final Rect tfocusRect) {
try {
List<Camera.Area> focusList = new ArrayList<Camera.Area>();
Camera.Area focusArea = new Camera.Area(tfocusRect, 1000);
focusList.add(focusArea);
Camera.Parameters param = mCamera.getParameters();
param.setFocusAreas(focusList);
param.setMeteringAreas(focusList);
mCamera.setParameters(param);
mCamera.autoFocus(myAutoFocusCallback);
} catch (Exception e) {
e.printStackTrace();
}
if (isNeedToTakePic()) {
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
float x = event.getX();
float y = event.getY();
Rect touchRect = new Rect(
(int) (x - 100),
(int) (y - 100),
(int) (x + 100),
(int) (y + 100));
final Rect targetFocusRect = new Rect(
touchRect.left * 2000 / this.getWidth() - 1000,
touchRect.top * 2000 / this.getHeight() - 1000,
touchRect.right * 2000 / this.getWidth() - 1000,
touchRect.bottom * 2000 / this.getHeight() - 1000);
doTouchFocus(targetFocusRect);
}
return false;
}
public boolean isNeedToTakePic() {
return needToTakePic;
}
public void setNeedToTakePic(boolean needToTakePic) {
this.needToTakePic = needToTakePic;
}
public void turnOnFlashLight() {
if (isLightOn == true) {
Camera.Parameters p = mCamera.getParameters();
p.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
mCamera.setParameters(p);
mCamera.stopPreview();
isLightOn = false;
}else{
isLightOn = true;
}
}
private Camera.PictureCallback mPicture = new Camera.PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
File pictureFile = getOutputMediaFile(MEDIA_TYPE_IMAGE);
if (pictureFile == null){
return;
}
try {
FileOutputStream fos = new FileOutputStream(pictureFile);
fos.write(data);
fos.close();
} catch (FileNotFoundException e) {
Log.d(TAG, "File not found: " + e.getMessage());
} catch (IOException e) {
Log.d(TAG, "Error accessing file: " + e.getMessage());
}
}
};
private static File getOutputMediaFile(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES), "MyCameraApp");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()){
if (! mediaStorageDir.mkdirs()){
Log.d("MyCameraApp", "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else {
return null;
}
return mediaFile;
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000"
>
<Button
android:id="@+id/picture"
android:layout_width="75dp"
android:layout_height="75dp"
android:layout_gravity="center_horizontal|bottom"
android:background="@drawable/circle"
android:layout_marginBottom="18dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true" />
<Button
android:layout_width="30dp"
android:layout_height="30dp"
android:id = "@+id/bearPaw"
android:background="@mipmap/ic_launcher"
android:layout_gravity="left|bottom"
android:layout_marginBottom="34dp"
android:layout_alignParentBottom="true"
android:layout_marginLeft="48dp" />
<Button
android:layout_width="50dp"
android:layout_height="50dp"
android:id = "@+id/flah_off"
android:background="@mipmap/flah_off"
android:layout_alignParentTop="true"
/>
</FrameLayout>
答案 0 :(得分：0)
我不相信这个Camera插件已被使用，并且我不相信我能够解决该问题，但是我不再从事此项目。我希望我提供的这段代码可以帮助其他人解决与Camera插件有关的问题。