如何捕获图像并将其保存在SD卡中 [英] How to capture the image and save it in sd card
问题描述
大家好,我正在使用以下代码从我的应用程序访问相机.该应用程序能够访问相机我还添加了一个按钮,其 onclicklistener 添加了这行代码:-
hey guys i am using the following code to access camera from my application. The application is able to access the camera i have also added a button whose onclicklistener adds this line of code :-
camera.takePicture(mShutterCallback, mPictureCallbackRaw, mPictureCallbackJpeg);
现在我不知道会发生什么,但应用程序卡住了,我必须强制关闭它,然后我什至无法访问本机相机应用程序.我认为它会在不释放 Camera 对象的情况下离开应用程序.加上图像永远不会被保存.
Now i dont know what happens but the application gets stuck i have to force close it and then i can not even access the native camera application. I think it leaves the application without releasing the Camera object. Plus the image never gets saved.
代码:-
SurfaceHolder holder;
SurfaceView surface;
Camera camera;
Boolean isPreviewRunning, fromOnResume;
//Preview mpreview;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
isPreviewRunning = false;
fromOnResume = false;
// requestWindowFeature(Window.FEATURE_NO_TITLE);
surface = (SurfaceView)findViewById(R.id.surface);
holder = surface.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
Button btn = (Button)findViewById(R.id.click);
btn.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
camera.takePicture(mShutterCallback, mPictureCallbackRaw, mPictureCallbackJpeg);
//onCreate(null);
}
});
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
/* if (isPreviewRunning) {
camera.stopPreview();
} */
Camera.Parameters parameters = camera.getParameters();
List<Size> sizes = parameters.getSupportedPreviewSizes();
Size size = sizes.get(0);
parameters.setPreviewSize(size.width, size.height);
camera.setParameters(parameters);
camera.startPreview();
isPreviewRunning=true;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
camera.stopPreview();
camera.release();
camera=null;
}
Camera.PictureCallback mPictureCallbackRaw = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera c) {
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK RAW: " + data);
camera.startPreview();
}
};
Camera.PictureCallback mPictureCallbackJpeg= new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera c) {
Log.e(getClass().getSimpleName(), "PICTURE CALLBACK JPEG: data.length = " + data);
camera.startPreview();
}
};
Camera.ShutterCallback mShutterCallback = new Camera.ShutterCallback() {
public void onShutter() {
Log.e(getClass().getSimpleName(), "SHUTTER CALLBACK");
}
};
/*
* protected void onRestoreInstanceState(Bundle savedInstanceState)
{
super.onRestoreInstanceState(savedInstanceState);
}
protected void onResume()
{
Log.e(getClass().getSimpleName(), "onResume");
camera.open();
fromOnResume=true;
super.onResume();
}
protected void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
camera.release();
super.onPause();
}
protected void onStop()
{
Log.e(getClass().getSimpleName(), "onStop");
super.onStop();
}*/
推荐答案
我知道这不能完全回答你的问题,但是使用股票相机应用程序不是更容易吗?您可以在活动中使用此代码访问它:
I know this isn't exactly an answer to your question, but wouldn'nt it be easier to use the stock camera application? You can access it using this code in your activity:
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.capture);
Button capture = (Button) findViewById(R.id.capture_button);
capture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// We use the stock camera app to take a photo
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, getImageUri());
startActivityForResult(intent, TAKE_PHOTO_CODE);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == TAKE_PHOTO_CODE && resultCode == RESULT_OK) {
Uri imagePath = getImageUri();
doSomething();
}
}
/**
* Get the uri of the captured file
* @return A Uri which path is the path of an image file, stored on the dcim folder
*/
private Uri getImageUri() {
// Store image in dcim
File file = new File(Environment.getExternalStorageDirectory() + "/DCIM", CAPTURE_TITLE);
Uri imgUri = Uri.fromFile(file);
return imgUri;
}
这篇关于如何捕获图像并将其保存在SD卡中的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!