Android Camera拍照功能
慕涵 人气:0本篇文章就项目开发遇到问题记录下；
1.拍照图片被压缩问题
2.拍照图片被旋转问题
首先实现一个自定义拍照功能。
自定义布局
<FrameLayout android:layout_below="@id/toolbar_layout" android:layout_width="match_parent" android:layout_height="match_parent" > <SurfaceView android:id="@+id/surface" android:layout_width="match_parent" android:layout_height="match_parent" android:keepScreenOn="true"/> </FrameLayout>
初始化控件：
surfaceView = (SurfaceView) findViewById(R.id.surface);
holder = surfaceView.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
btn.setOnCLickListener(new OnClickLister(View v){
if(mCamera == null){
mCamera = Camera.open();
}
mCamera.takePicture(null,null,this);
});
@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
initStartCamera(surfaceHolder);
}
@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) {
mCamera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
isAutoFocus = success;
initCameraParams();
mCamera.cancelAutoFocus();
mCamera.startPreview();
}
});
}
@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
// 当holder被回收时 释放硬件
// releaseCamera();
}
@Override
protected void onPause() {
super.onPause();
releaseCameraSource();
}
@Override
protected void onResume() {
super.onResume();
// TODO: 看看退出到其他页面是否有黑屏现象
if (surfaceView != null) {
surfaceView.postDelayed(new Runnable() {
@Override
public void run() {
initCameraParams();
}
}, 50);
}
}
private void initStartCamera(SurfaceHolder surfaceHolder) {
try {
mCamera = Camera.open();
mCamera.setDisplayOrientation(90);
mCamera.setPreviewDisplay(surfaceHolder);
mCamera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
private void initCameraParams() {
if (mCamera != null) {
Camera.Parameters parameters = mCamera.getParameters();
parameters.setPictureFormat(ImageFormat.JPEG);
parameters.setJpegQuality(90);
List<Camera.Size> supportedPictureSizes = parameters.getSupportedPictureSizes();
WindowManager manager = (WindowManager) getSystemService(WINDOW_SERVICE);
Display display = manager.getDefaultDisplay();
Point point = new Point();
display.getSize(point);
int screenWidth = point.x;
int screenHeight = point.y;
// 找到适合的图片的尺寸
if (supportedPictureSizes != null && !supportedPictureSizes.isEmpty()) {
int screenSize = screenHeight * screenWidth;
Camera.Size picSize = null;
for (Camera.Size size : supportedPictureSizes) {
int value = size.height * size.width;
if (value <= screenSize) {
if (picSize == null) {
picSize = size;
} else {
// 取最接近屏幕尺寸的
if (value > picSize.width * picSize.height) {
picSize = size;
}
}
}
}
if (picSize == null) {
picSize = supportedPictureSizes.get(0);
}
parameters.setPictureSize(picSize.width, picSize.height);
}
// 设置对焦模式
List<String> supportedFocusModes = parameters.getSupportedFocusModes();
if (supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE)) {
// 快速对焦
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_PICTURE);
} else {
parameters.setFocusMode(Camera.Parameters.FLASH_MODE_AUTO);
}
try {
mCamera.setParameters(parameters);
mCamera.startPreview();
} catch (Exception e) {
e.printStackTrace();
}
}
}
private void releaseCameraSource() {
if (mCamera != null) {
mCamera.setPreviewCallback(null);
mCamera.stopPreview();
mCamera.release();
mCamera = null;
}
}调用相机的拍摄功能：
点击拍照调用camera.takePicture(null,null,this);
获取拍照回调回来的图片数据
public void onPictureTaken(final byte[] bytes,final Camera camera){
// 拍照回掉回来的 图片数据。
final String filePath = Environment.getExternalStorageDirectory().getPath() + "/DCIM/Camera/";
final String picturePath = System.currentTimeMillis() + ".jpg";
final File file = new File(filePath, picturePath);
new Thread(new Runnable() {
@Override
public void run() {
Bitmap bitmap = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
bitmap = rotateBitmapByDegree(bitmap, 90);
BufferedOutputStream bos = null;
try {
//防止拍照保存图片被压缩
bos = new BufferedOutputStream(new FileOutputStream(file));
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
bitmap.recycle();
Intent intent = new Intent(TakePhotoActivity.this,TPreViewPicActivity.class);
intent.putExtra("filePath",filePath);
intent.putExtra("picturePath",picturePath);
startActivityForResult(intent,102);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}).start();
}接下来要说的就是我们上面说到的保存图片被旋转的问题：
public Bitmap rotateBitmapByDegree(Bitmap bm,int degree){
Bitmap bitmap ;
Matrix matrix = new Matrix();
matrix.postRotate(degree);
try{
bitmap = Bitmap.createBitmap(bm,0,bm.getWidth,bm.getHeight,matrix,true);
}catch(OutOfMemoryError e){
e.printStackTrace();
}
if(bitmap == null){
bitmap = bm;
}
if(bm != bitmap){
bm.recycle();
}
return bitmap;
}
@Override
public void onPause(){
super.onPause();
if(camera != null){
if(isPrevew){
camera.stopPreview();
camera.release();
camera= null;
isPreView= false;
}
}
}
@Override
protected void onResume() {
super.onResume();
openCamera();
}*#额外要说明的是，android 6.0权限问题，可能会导致首次进入拍照界面黑屏，解决方案在拍照界面之前请求权限；
最后附上请求权限代码：
public void checkPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{Manifest.permission.CAMERA}
, new TCallPhoneTool.PermissionListener() {
@Override
public void onGranted() {
// openCamera();
}
@Override
public void onRefused(List<String> deniedPermissions) {
showMissingPermissionDialog();
}
});
} else {
// openCamera();
}
}
TCallPhoneTool.PermissionListener mListener ;
final int REQUEST_CODE_STORAGE = 131;
public void requestPermissions(String[] permissions, TCallPhoneTool.PermissionListener listener) {
List<String> deniedPermissions = new ArrayList<>() ;
mListener = listener ;
for (String permission : permissions) {
if (ContextCompat.checkSelfPermission(this,permission) == PackageManager.PERMISSION_DENIED) {
deniedPermissions.add(permission);
}
}
if (deniedPermissions.size() > 0) {
ActivityCompat.requestPermissions(this,deniedPermissions.toArray(new String[deniedPermissions.size()]),REQUEST_CODE_STORAGE);
} else {
mListener.onGranted();
}
}
public void showMissingPermissionDialog() {
android.support.v7.app.AlertDialog.Builder builder = new android.support.v7.app.AlertDialog.Builder(this);
builder.setTitle(getString(com.to8to.baselib.R.string.tip_permision_miss));
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
startAppSetting();
}
});
builder.setCancelable(false);
builder.show();
public void startAppSetting() {
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
intent.setData(Uri.parse("package:" + this.getPackageName()));
startActivity(intent);
}加载全部内容