所以，我有一个应用程序，我想拍照，将其存储到内部存储，然后能够以后检索它（可能是通过它的Uri）。这是我到目前为止： 按下我的自定义相机按钮时会触发此代码。
cameraButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Intent takePic = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File file = herp(MEDIA_TYPE_IMAGE);
if (file != null) {
fileUri = getOutputMediaFileUri(file);
Log.d("AddRecipeActivity", fileUri.toString());
takePic.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
startActivityForResult(takePic, CAMERA_REQUEST);
}
}
});
接下来，我在代码中定义了两种方法（主要来自android开发者网站）：
/** Create a file Uri for saving an image or video */
private static Uri getOutputMediaFileUri(File file){
return Uri.fromFile(file);
}
/** Create a File for saving an image or video */
public File herp(int type){
// To be safe, you should check that the SDCard is mounted
// using Environment.getExternalStorageState() before doing this.
Boolean a = false;
String externalDirectory= getFilesDir().getAbsolutePath();
File folder= new File(externalDirectory + "/NewFolder");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (!folder.exists()){
a = folder.mkdirs();
Log.d("AddRecipeActivity", String.valueOf(a));
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(folder.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else {
return null;
}
if(mediaFile == null){
Log.d("AddRecipeActivity", "Media file is null");
}
return mediaFile;
}
当我打印我的Uri时（在触发意图之前），我得到以下输出。
04-04 04:22:40.757 22402-22402/scissorkick.com.project2 D/AddRecipeActivity: file:///data/user/0/scissorkick.com.project2/files/NewFolder/IMG_20160404_042240.jpg
另外，当我检查目录是否成功时，布尔值为true。 但是，当我的相机意图运行onActivityResult时，结果代码为0.
为什么它会在这一点上失败？我已在清单中定义了适当的权限，并在运行时请求外部存储写入权限。
编辑：添加了onActivityResult：
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data){
if(requestCode == CAMERA_REQUEST){
Log.d("AddRecipe", String.valueOf(resultCode));
if(resultCode == RESULT_OK){
photo = (Bitmap) data.getExtras().get("data");
thumb = ThumbnailUtils.extractThumbnail(photo, 240, 240);
photoView.setImageBitmap(thumb);
//Toast.makeText(getApplicationContext(), "image saved to:\n" + data.getData(), Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(getApplicationContext(), "Fail", Toast.LENGTH_SHORT).show();
}
}
}
onActivityResult中有一些无意义的代码，但重点是resultCode = 0而且我不知道原因。
答案 0 :(得分：0)
在最后的活动中，请输入以下代码
data.putExtra("uri", uri);//uri = your image uri
getActivity().setResult(""result_code", data);
getActivity().finish();
然后在你的onActivityResult代码中你可以得到像uri一样的
Uri uri = data.getExtras().getParcelable("uri");
然后您可以使用此Uri值来检索图像。
答案 1 :(得分：0)
我的应用程序中有我拍照的方式！
当我按下我自己的图像按钮
时static final int REQUEST_IMAGE_CAPTURE = 1;
static final int REQUEST_TAKE_PHOTO = 1
static final String STATE_PHOTO_PATH = "photoPath";
ImageButton photoButton = (ImageButton) this.findViewById(R.id.take_picture_button);
photoButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent();
}
});
以下是如何管理和创建/存储带图像的文件
private File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
File storageDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
mCurrentPhotoPath = "file:" + image.getAbsolutePath();
return image;
}
//Create a new empty file for the photo, and with intent call the camera
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException e) {
// Error occurred while creating the File
Log.e("Error creating File", String.valueOf(e.getMessage()));
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
//I have the file so now call the Camera
startActivityForResult(takePictureIntent, REQUEST_TAKE_PHOTO);
}
}
}
private void openImageReader(String imagePath) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_VIEW);
Uri imgUri = Uri.parse(imagePath);
intent.setDataAndType(imgUri, "image/*");
startActivity(intent);
}
在ActivityResult中，我只保存数据库中的记录，使用图像的路径，以便我可以将其检索回来并读取存储的文件，如文件。
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
//Save the path of image in the DB
db.addCompito(new Compiti(activity_name, null, mCurrentPhotoPath));
refreshListView();
}
}
如果您有一些屏幕旋转，请不要忘记添加类似
的内容@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
// Save the user's current game state
savedInstanceState.putString(STATE_PHOTO_PATH, mCurrentPhotoPath);
// Always call the superclass so it can save the view hierarchy state
super.onSaveInstanceState(savedInstanceState);
}
public void onRestoreInstanceState(Bundle savedInstanceState) {
// Always call the superclass so it can restore the view hierarchy
super.onRestoreInstanceState(savedInstanceState);
// Restore state members from saved instance
mCurrentPhotoPath = savedInstanceState.getString(STATE_PHOTO_PATH);
}
<强> WHY吗
因为当轮换更改时，您可能会丢失为＆＃34;新照片创建的文件＆＃34;当你接受并保存它时，你的影视作品为空并且没有创建图像。