我无法将拍摄的图像保存到具有特定名称的特定目录。我不知道该怎么做。以下是我的代码。
CameraCaptureImage.java
public class CaptureCameraImage extends Activity {
public static int cameraID = 0;
public static boolean isBlack = true;
public static ImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activitycapturecameraimage);
image = (ImageView) findViewById(R.id.imgView);
}
public void onBackClick(View v){
cameraID = 0;
Intent i = new Intent(CaptureCameraImage.this,CameraView.class);
startActivityForResult(i, 999);
}
}
CameraView.java
public class CameraView extends Activity implements SurfaceHolder.Callback, OnClickListener{
private static final String TAG = "CameraTest";
Camera mCamera;
boolean mPreviewRunning = false;
@SuppressWarnings("deprecation")
public void onCreate(Bundle icicle){
super.onCreate(icicle);
Log.e(TAG, "onCreate");
getWindow().setFormat(PixelFormat.TRANSLUCENT);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.cameraview);
ImageView img = (ImageView) findViewById(R.id.blankImage);
if(CaptureCameraImage.isBlack)
img.setBackgroundResource(android.R.color.black);
else
img.setBackgroundResource(android.R.color.white);
mSurfaceView = (SurfaceView) findViewById(R.id.surface_camera);
mSurfaceView.setOnClickListener(this);
mSurfaceHolder = mSurfaceView.getHolder();
mSurfaceHolder.addCallback(this);
mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState){
super.onRestoreInstanceState(savedInstanceState);
}
Camera.PictureCallback mPictureCallback = new Camera.PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
if (data != null){
//Intent mIntent = new Intent();
//mIntent.putExtra("image",imageData);
mCamera.stopPreview();
mPreviewRunning = false;
mCamera.release();
try{
BitmapFactory.Options opts = new BitmapFactory.Options();
Bitmap bitmap= BitmapFactory.decodeByteArray(data, 0, data.length,opts);
bitmap = Bitmap.createScaledBitmap(bitmap, 300, 300, false);
int width = bitmap.getWidth();
int height = bitmap.getHeight();
int newWidth = 300;
int newHeight = 300;
// calculate the scale - in this case = 0.4f
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
// createa matrix for the manipulation
Matrix matrix = new Matrix();
// resize the bit map
matrix.postScale(scaleWidth, scaleHeight);
// rotate the Bitmap
matrix.postRotate(90);
Bitmap resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
width, height, matrix, true);
CaptureCameraImage.image.setImageBitmap(resizedBitmap);
}catch(Exception e){
e.printStackTrace();
}
//StoreByteImage(mContext, imageData, 50,"ImageName");
//setResult(FOTO_MODE, mIntent);
setResult(585);
finish();
}
}
};
protected void onResume(){
Log.e(TAG, "onResume");
super.onResume();
}
protected void onSaveInstanceState(Bundle outState){
super.onSaveInstanceState(outState);
}
protected void onStop(){
Log.e(TAG, "onStop");
super.onStop();
}
@TargetApi(9)
public void surfaceCreated(SurfaceHolder holder){
Log.e(TAG, "surfaceCreated");
mCamera = Camera.open(CaptureCameraImage.cameraID);
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
Log.e(TAG, "surfaceChanged");
// XXX stopPreview() will crash if preview is not running
if (mPreviewRunning){
mCamera.stopPreview();
}
Camera.Parameters p = mCamera.getParameters();
p.setPreviewSize(300, 300);
if(CaptureCameraImage.cameraID == 0){
String stringFlashMode = p.getFlashMode();
if (stringFlashMode.equals("torch"))
p.setFlashMode("on"); // Light is set off, flash is set to normal 'on' mode
else
p.setFlashMode("torch");
}
mCamera.setParameters(p);
try{
mCamera.setPreviewDisplay(holder);
}catch (Exception e){
// TODO Auto-generated catch block
e.printStackTrace();
}
mCamera.startPreview();
mPreviewRunning = true;
mCamera.takePicture(null, mPictureCallback, mPictureCallback);
}
public void surfaceDestroyed(SurfaceHolder holder) {
Log.e(TAG, "surfaceDestroyed");
//mCamera.stopPreview();
//mPreviewRunning = false;
//mCamera.release();
}
private SurfaceView mSurfaceView;
private SurfaceHolder mSurfaceHolder;
public void onClick(View v) {
// TODO Auto-generated method stub
mCamera.takePicture(null, mPictureCallback, mPictureCallback);
}
}
答案 0 :(得分：0)
要捕获图像并将其保存在特定文件夹中，您必须：
首先，如果你的目标是API 23，你必须遵循新的权限系统，该系统要求用户仅在第一次使用时才授予它。在您的情况下，您需要授予WRITE_EXTERNAL_STORAGE。
boolean hasPermission = (ContextCompat.checkSelfPermission(this,
Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED);
if (!hasPermission) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},
REQUEST_WRITE_STORAGE);
}
然后，您需要创建隐藏的意图来捕获照片。相机应用程序可以显示在应用程序选择器中，也可以根据用户设置和已安装的应用程序自动选择。
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, REQUEST_IMAGE_CAPTURE); // final int = 1
最后，您需要创建文件夹并指明额外输出，以便Android知道保存图片的位置。
//Intent i = new intent...
long timestamp = System.currentTimeMillis();
File file = new File("");
file = new File(Environment.getExternalStorageDirectory()
+ File.separator
+ "DCIM"
+ File.separator
+ address
+ File.separator
, "IMG_" + String.valueOf(timestamp) + ".jpg");
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(file));
//startActivityForResult...
有很多存储空间。你可以看看这里： https://developer.android.com/training/basics/data-storage/files.html
我在onActivityResult回调方法中没有做任何特别的事情。我只显示一个祝酒词以确认用户图片已成功保存。在我的例子中，上面的所有代码都在imageView的onClickListener中。