無法從URI在Imageview上加載圖像

Question

我正在嘗試加載存儲在應用程序文件夾中的圖像，當我打開“活動”時，我從logcat收到此錯誤：

1-20 01：30：40.125 14331-14331 / mx.eusaga.af W / ImageView：無法打開內容：content：//mx.eusaga.af.fileprovider/imagenes/1-db384fa8-f28b-4595-abbf- d45d38fd4036.jpg java.io.FileNotFoundException：在android.os.ParcelFileDescriptor.open（android.os.ParcelFileDescriptor.openInternal（ParcelFileDescriptor.java:253）處的android.os.Parcel.openFileDescriptor（本機方法）處沒有此類文件或目錄ParcelFileDescriptor.java:199）位於android.support.v4.content.FileProvider.openFile（FileProvider.java:545）位於android.content.ContentProvider.openAssetFile（ContentProvider.java:1322）在android.content.ContentProvider.openTypedAssetFile（ContentProvider） .java：1502），位於android.content.ContentProvider.openTypedAssetFile（ContentProvider.java:1568），位於android.content.ContentProvider $ Transport.openTypedAssetFile（ContentProvider.java:391），位於android.content.ContentResolver.openTypedAssetFileDescriptor（ContentResolver.java： 1080），位於android.content.ContentResolver.openAssetFileDescriptor（ContentResolver.j ava：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）位於mx.eusaga.af.Adapter.ImagenAdapter.onBindViewHolder（ImagenAdapter.java:51）位於mx.eusaga.af.Adapter.ImagenAdapter.onBindViewHolder（在android.support.v7.widget.RecyclerView $ Adapter.onBindViewHolder（RecyclerView.java:6482）處的ImagenAdapter.java:30）在android.support.v7.widget.RecyclerView $ Adapter.bindViewHolder（RecyclerView.java:6515）處android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline（RecyclerView.java:5724）上的.support.v7.widget.RecyclerView $ Recycler.tryBindViewHolderByDeadline（RecyclerView.java:5458）。 $ Recycler.getViewForPosition（RecyclerView.java:5563）在android.support.v7.widget.RecyclerView $ Recycler.getViewFo android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:2229）位於android.support.v7.widget.GridLayoutManager.layoutChunk（GridLayoutManager.java:556）位於rPosition（RecyclerView.java:5559） android.support.v7.widget.LinearLayoutManager.onLayoutChildren（LinearLayoutManager.java:608）上的.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1516）android.support.v7.widget.GridLayoutManager.onLayoutChildren（GridLayoutManager .java：170）位於android.support.v7.widget.RecyclerView.dispatchLayoutStep2（RecyclerView.java：3693）（位於android.support.v7.widget.RecyclerView.onMeasure（RecyclerView.java：3109）位於android.view.View。 android.widget.LinearLayout.measureVertical（LinearLayout.java）上android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5535）上Measure（View.java:17547）android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1436）上：722），位於android.view的android.widget.LinearLayout.onMeasure（LinearLayout.java:613）。 位於android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5535）的View.measure（View.java:17547）位於android.support.v7.widget.ContentFrameLayout的android.widget.FrameLayout.onMeasure（FrameLayout.java:436） .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。的android.widget.LinearLayout.measureVertical（LinearLayout.java:722）處的android.widget.LinearLayout.onMeasure（LinearLayout.java:613）處的android.view.View.measure（View.java:17547）處的java：1436） android.widget.FrameLayout.onMeasure（FrameLayout.java:436）的android.view.ViewGroup.measureChildWithMargins（ViewGroup.java:5535）android.view.ViewGroup的android.view.View.measure（View.java:17547） android.widget.LinearLayout.measureChildBeforeLayout（LinearLayout.java:1436）的.measureChildWithMargins（ViewGroup.java:5535）android.widget.LinearLayout.measureVerti的。 android.widget.LinearLayout.onMeasure（L）處的cal（LinearLayout.java:722）

Im用於獲取圖像的代碼如下：

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;
}

這是我的文件提供者：

<!-- 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>

這些是我的文件路徑：

<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="imagenes" path="imagenes/"/>
</paths>

文件夾imagenes和文件1-db384fa8-f28b-4595-abbf-d45d38fd4036.jpg存在於正確的文件夾中。

謝謝您的幫助！！

Answer 1

您是否嘗試過畢加索： http : //square.github.io/picasso/ ？ 您可以使用更少的代碼從文件加載圖像。

Answer 2

您的錯誤說

FileNotFoundException

表示您提供的路徑無效。.請檢查您的目錄和文件路徑

Answer 3

您尚未在清單中添加READ_EXTERNAL_STORAGE權限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

要在運行時授予權限，請使用以下代碼。

    public final int REQUEST_CODE_ASK_MULTIPLE_PERMISSIONS = 124;
    public static final int NO_RESULT = -5;
    public static final String ALERT_TITLE = "Demo";

onCreate（）中的調用方法

    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);
        }
    }

Answer 4

 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");
}