i与动作android.provider.MediaStore.ACTION_IMAGE_CAPTURE
一起使用意图来捕获图像并获取图像的路径。到达路径后,我将其解码为位图。
Bitmap photoBitmap = BitmapFactory.decodeFile(currentPhotoPath);
所有人在 device1 上都很好地工作,图像路径的日志如下:
/storage/emulated/0/Pictures/QPOS/IMG_20160622_110127_1473532607.jpg
然后,我将应用程序运行到新的设备调用 device2 。我在捕获图像后获得的图像路径:
/storage/emulated/0/Pictures/QPOS/IMG_20160622_105436_2068195440.jpg
看起来很正常。但是解码方法在此行返回一个空位图
Bitmap photoBitmap = BitmapFactory.decodeFile(currentPhotoPath);
我不知道为什么两个设备之间有不同,我在同一源代码上构建。您能解释为什么我为方法解码文件有空位图吗?以及如何解决此问题?谢谢。
更新:我通过此方法添加了API 23的请求权限:
private void requestPermissions() {
Log.d("binh", "request Permision");
if (Build.VERSION.SDK_INT >= 23) {
List<String> permissionRequestList = new ArrayList<>();
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
permissionRequestList.add(android.Manifest.permission.CAMERA);
}
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
permissionRequestList.add(android.Manifest.permission.ACCESS_FINE_LOCATION);
}
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
permissionRequestList.add(android.Manifest.permission.READ_EXTERNAL_STORAGE);
}
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
permissionRequestList.add(android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
}
if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.READ_PHONE_STATE)
!= PackageManager.PERMISSION_GRANTED) {
permissionRequestList.add(android.Manifest.permission.READ_PHONE_STATE);
}
if (permissionRequestList.size() > 0) {
ActivityCompat.requestPermissions(this, permissionRequestList.toArray(new String[permissionRequestList.size()]), Constants.REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
}
}
}
这是为图像创建路径的代码:
private File setUpPhotoFile() throws IOException {
File f = createImageFile();
currentPhotoPath = f.getAbsolutePath();
return f;
}
private File createImageFile() throws IOException {
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = JPEG_FILE_PREFIX + timeStamp + "_";
File albumF = getAlbumDir();
File imageF = File.createTempFile(imageFileName, JPEG_FILE_SUFFIX, albumF);
return imageF;
}
private File getAlbumDir() {
File storageDir = null;
if (Environment.MEDIA_MOUNTED.equals(Environment.getExternalStorageState())) {
//storageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), getString(R.string.app_name));
storageDir = new File(
getExternalFilesDir(Environment.DIRECTORY_PICTURES), getString(R.string.app_name));
if (storageDir != null) {
if (!storageDir.mkdirs()) {
if (!storageDir.exists()) {
Log.d("CameraSample", "failed to create directory");
return null;
}
}
}
} else {
Log.d(getString(R.string.app_name), "External storage is not mounted READ/WRITE.");
}
return storageDir;
}
构建并授予对话的许可后,我遇到了同样的问题。
可能是您的 device1 's android sdk&lt;23和 device2 's android sdk == 23请检查read_external_storage权限根据Android SDK 23(需要运行时间)管理。
似乎是alpha频道的问题,因此您应该使用一个格式来保存alpha:
检查下面的代码:
BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap photoBitmap = BitmapFactory.decodeFile(currentPhotoPath, options);