我正在尝试加载存储在应用程序文件文件夹中的图像 当我打开活动时,我从logcat获取此错误:
1-20 01:30:40.125 14331-14331 / mx.eusaga.af W / ImageView:无法打开 内容: 内容://mx.eusaga.af.fileprovider/imagenes/1-db384fa8-f28b-4595-abbf-d45d38fd4036.jpg java.io.FileNotFoundException:没有这样的文件或目录 在android.os.Parcel.openFileDescriptor(本机方法) 在android.os.ParcelFileDescriptor.openInternal(ParcelFileDescriptor.java:253) 在android.os.ParcelFileDescriptor.open(ParcelFileDescriptor.java:199) 在android.support.v4.content.FileProvider.openFile(FileProvider.java:545) 在android.content.ContentProvider.openAssetFile(ContentProvider.java:1322) 在android.content.ContentProvider.openTypedAssetFile(ContentProvider.java:1502) 在android.content.ContentProvider.openTypedAssetFile(ContentProvider.java:1568) 在android.content.ContentProvider $ Transport.openTypedAssetFile(ContentProvider.java:391) 在android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1080) 在android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:921) 在android.content.ContentResolver.openInputStream(ContentResolver.java:646) 在android.widget.ImageView.resolveUri(ImageView.java:768) 在android.widget.ImageView.setImageURI(ImageView.java:429) 在android.support.v7.widget.AppCompatImageView.setImageURI(AppCompatImageView.java:124) 在mx.eusaga.af.Adapter.ImagenAdapter.onBindViewHolder(ImagenAdapter.java:51) 在mx.eusaga.af.Adapter.ImagenAdapter.onBindViewHolder(ImagenAdapter.java:30) 在android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder(RecyclerView.java:6482) 在android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder(RecyclerView.java:6515) 在android.support.v7.widget.RecyclerView $ Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5458) 在android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5724) 在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition(RecyclerView.java:5563) 在android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition(RecyclerView.java:5559) 在android.support.v7.widget.LinearLayoutManager $ LayoutState.next(LinearLayoutManager.java:2229) 在android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:556) 在android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1516) 在android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:608) 在android.support.v7.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170) 在android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693) 在android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3109) 在android.view.View.measure(View.java:17547) 在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 在android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 在android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 在android.view.View.measure(View.java:17547) 在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 在android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 在android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139) 在android.view.View.measure(View.java:17547) 在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 在android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 在android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 在android.view.View.measure(View.java:17547) 在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 在android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 在android.view.View.measure(View.java:17547) 在android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 在android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 在android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 在android.widget.LinearLayout.onMeasure(L
用于获取图像的代码如下:
private Uri obtenerImagen(String archivo) {
File Directorio = new File(context.getFilesDir() + "/imagenes/");
Directorio.mkdirs();
File imagen = new File(Directorio,archivo + ".jpg");
Uri uri = FileProvider.getUriForFile(context,"mx.eusaga.af.fileprovider",imagen);
return uri;
}
这是我的文件提供者:
<!-- FileProvider -->
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="mx.eusaga.af.fileprovider"
android:exported="false"
android:grantUriPermissions="true" >
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/file_paths" />
</provider>
这些是我的文件路径:
<paths xmlns:android="http://schemas.android.com/apk/res/android">
<files-path name="imagenes" path="imagenes/"/>
</paths>
文件夹 imagenes ,文件 1-db384fa8-f28b-4595-abbf-d45d38fd4036.jpg 存在于正确的文件夹中。
感谢您的帮助!!
答案 0 :(得分:0)
你有没有试过毕加索:http://square.github.io/picasso/? 您可以使用更少的代码从文件加载图像。
答案 1 :(得分:0)
Ur错误说
FileNotFoundException
表示您提供的路径无效。 Plz检查您的目录和文件路径
答案 2 :(得分:0)
您尚未在清单
中添加READ_EXTERNAL_STORAGE预设
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
在运行时使用以下代码进行权限授予。
public final int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124;
public static final int NO_RESULT = -5;
public static final String ALERT_TITLE = "Demo";
onCreate()
中的call方法
askMarshmallowPermissions();
> private void askMarshmallowPermissions() {
> List<String> permissionsNeeded = new ArrayList<String>();
>
> final List<String> permissionsList = new ArrayList<String>();
>
> if (!addPermission(permissionsList, android.Manifest.permission.WRITE_EXTERNAL_STORAGE))
> permissionsNeeded.add("Write to storage");
>
> if (permissionsList.size() > 0) {
> if (permissionsNeeded.size() > 0) {
> // Need Rationale
> String message = "You need to grant access to " + permissionsNeeded.get(0);
> for (int i = 1; i < permissionsNeeded.size(); i++)
> message = message + ", " + permissionsNeeded.get(i);
> showMessageOKCancel(message,
> new DialogInterface.OnClickListener() {
> @Override
> public void onClick(DialogInterface dialog, int which) {
> ActivityCompat.requestPermissions(MainActivity.this,
> permissionsList.toArray(new String[permissionsList.size()]),
> REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
> }
> });
> return;
> }
> ActivityCompat.requestPermissions(MainActivity.this, permissionsList.toArray(new String[permissionsList.size()]),
> REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS);
> return;
> }
> callAfterPermission();
> }
>
>
> private void callAfterPermission() {
> // your code after premission granted.
> }
private boolean addPermission(List<String> permissionsList, String permission) {
if (ContextCompat.checkSelfPermission(MainActivity.this, permission) != PackageManager.PERMISSION_GRANTED) {
permissionsList.add(permission);
// Check for Rationale Option
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (!ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, permission))
return false;
}
}
return true;
}
private void showMessageOKCancel(String message, DialogInterface.OnClickListener okListener) {
new AlertDialog.Builder(MainActivity.this)
.setMessage(message)
.setPositiveButton("OK", okListener)
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
showAlertDialogWithFinishActivity(MainActivity.this,
"01 - Please grant all required permissions to " +
"continue running the app. Please Restart the App and allow Permissions.",
ALERT_TITLE, true, NO_RESULT, null);
}
})
.create()
.show();
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
switch (requestCode) {
case REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS: {
Map<String, Integer> perms = new HashMap<String, Integer>();
// Initial
perms.put(android.Manifest.permission.WRITE_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
perms.put(android.Manifest.permission.READ_EXTERNAL_STORAGE, PackageManager.PERMISSION_GRANTED);
// Fill with results
for (int i = 0; i < permissions.length; i++)
perms.put(permissions[i], grantResults[i]);
// Check for ACCESS_FINE_LOCATION
if (perms.get(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED
&& perms.get(android.Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
callAfterPermission();
} else {
showAlertDialogWithFinishActivity(MainActivity.this,
"02 - Please grant all required permissions to " +
"continue running the app. Please restart the app and allow permissions.",
ALERT_TITLE, true, NO_RESULT, null);
}
}
break;
default:
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
}
答案 3 :(得分:0)
String folderpath = "/data/data/" + getPackageName() + "/files";
String imagefolderpath = "/data/data/" + getPackageName() + "/files" + "/images";
File fileFolder = new File(folderpath);
// check if file Folder exists, if not create one and its subfolders
if (!fileFolder.exists()) {
fileFolder.mkdir();
}
File imageFolder = new File(imagefolderpath);
// check if image Folder exists, if not create one and its subfolders
if (!imageFolder.exists()) {
imageFolder.mkdir();
}
String imageFilePath = imageFolder + "/test.jpg";
File imagePath = new File(imageFilePath);
if (!imageFolder.exists()) {
Log.d("Log","Image not exists");
}