Camera的使用。橫豎屏，畫面不變形
jiep.png
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一、調用系統提供的拍照
private void takePic() {
String imgPath = "/sdcard/test/img.jpg";
File file = new File(imgPath);
if(!file.exists()){
File parentFile = file.getParentFile();
parentFile.mkdirs();
}
Uri uri = Uri.fromFile(file);
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, uri);
startActivityForResult(intent,100);
}
二、自定義Camera
調用系統的Camera 實現拍照，UI界面是系統提供的，定制性降低了 。
創建類繼承與SurfaceView，并addCallback(this),在回調初始化預覽
@Override
public void surfaceCreated(SurfaceHolder holder) {
setStartPreview(mCamera, holder);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Log.e("surfaceChanged", " ---- width = " + width + " height = " + height);
Log.e("surfaceChanged", "-----> getDeviceHeight = " + getDeviceHeight());
mSurfaceWidth = width;
mSurfaceHeight = height;
if (mSurfaceHolder.getSurface() == null || mCamera == null) {
return;
}
try {
mCamera.stopPreview();
}catch (Exception e){
e.printStackTrace();
}
setStartPreview(mCamera,mSurfaceHolder);
setCameraParams(width, height);
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
releaseCamera();
}
- surfaceChanged：拍照狀態改變時調用。當我們切換橫豎屏會調用該方法，需要對預覽界面大previewsize進行處理不然畫面會拉伸的很厲害。在
setCameraParams(width, height);設置camera預覽參數
public void setCameraParams(int width, int height){
Camera.Parameters parameters = mCamera.getParameters();
List<Camera.Size> supportedPictureSizes = parameters.getSupportedPictureSizes();
List<Camera.Size> videoSizes = parameters.getSupportedVideoSizes();
Camera.Size optimalVideoSize = CameraHelper.getOptimalVideoSize(videoSizes, supportedPictureSizes, width, height);
parameters.setPictureFormat(ImageFormat.JPEG);
Log.e("setCameraParams","----- width = " +optimalVideoSize.width +" height = " + optimalVideoSize.height);
parameters.setPreviewSize(optimalVideoSize.width, optimalVideoSize.height);
parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
mCamera.setParameters(parameters);
}
主要使用了CameraHelper，在 Android 中錄制視頻時顯示的 Size 和實際拍照的 Size 是由 Camera 所決定的，最好的方法是計算出可支持的 PreviewSize 和 VideoSize 計算出一個合適的size，同時根據自己視頻的用途，選擇合理的 Size
CameraHelper 參考自 GoogleCameraSample 幫助你計算出合適的 Size
- surfaceCreated：當surface被創建的時候調用。在
setStartPreview方法初始化預覽
public void setStartPreview(Camera camera, SurfaceHolder surfaceHolder) {
try {
Log.e("setStartPreview", "---- mIsPortrait = " + mIsPortrait);
camera.setPreviewDisplay(surfaceHolder);
if(mIsPortrait){
camera.setDisplayOrientation(90);
}else{
camera.setDisplayOrientation(0);
}
camera.startPreview();
} catch (IOException e) {
e.printStackTrace();
}
}
- surfaceDestroyed：主要是在surface被銷毀的時候做一些回收的工作。
拍照
public void capture(View view) {
//自動對焦
mCamera.autoFocus(new Camera.AutoFocusCallback() {
@Override
public void onAutoFocus(boolean success, Camera camera) {
Log.e("autoFocus", "----- success = " + success);
if (success) {
mCamera.takePicture(null,null,null,mPictureCallback);
}
}
});
}
在mPictureCallback回調獲取拍照返回。
END
