找不到用于处理意图的活动{act = android.intent.action.PICK dat = [null，/ storage / emulated / 0 / WhatsApp / Media / WhatsApp视频]

Question

当我传递一些已经存储在数据库中的路径时，出现了这样的错误。

实际上我正在使用以下代码

ArrayList path_list;

 Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
         uri = Uri.parse(path_list.get(2).toString());
        intent.setDataAndType(uri,"video/*");
        Log.e("URI",uri.toString());
        startActivityForResult(Intent.createChooser(intent, "Open folder"),152);

因此，请提出我可以使用相同的代码还是必须更改其中任何内容的建议。

Databasehelper类

  public ArrayList<String> getpaths()
{
    ArrayList<String> path_list = new ArrayList<String>();

    //hp = new HashMap();
    SQLiteDatabase db = this.getReadableDatabase("somePass");
    Cursor res =  db.rawQuery( "select * from Configuration", null );
    res.moveToFirst();

    while(res.isAfterLast() == false){
        path_list.add(res.getString(res.getColumnIndex(COLUMN_NAME_VIDEOPATH)));
        res.moveToNext();
    }
    return path_list;
}

打开文件夹后获取所选路径

 String selectedMediaPath = null;
            if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
                selectedMediaPath = getPath(this, uri);
                Log.e("path", path_list.get(2).toString());
                Log.d("mediapath",selectedMediaPath);
            }

这是getpath（）方法：

 @RequiresApi(api = Build.VERSION_CODES.KITKAT)
public static String getPath(final Context context, final Uri uri) {

    final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;

    // DocumentProvider
    if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
        // ExternalStorageProvider
        if (isExternalStorageDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            if ("primary".equalsIgnoreCase(type)) {
                return Environment.getExternalStorageDirectory() + "/" + split[1];
            }

            // TODO handle non-primary volumes
        }
        // DownloadsProvider
        else if (isDownloadsDocument(uri)) {

            final String id = DocumentsContract.getDocumentId(uri);
            final Uri contentUri = ContentUris.withAppendedId(
                    Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));

            return getDataColumn(context, contentUri, null, null);
        }
        // MediaProvider
        else if (isMediaDocument(uri)) {
            final String docId = DocumentsContract.getDocumentId(uri);
            final String[] split = docId.split(":");
            final String type = split[0];

            Uri contentUri = null;
            if ("image".equals(type)) {
                contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
            } else if ("video".equals(type)) {
                contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
            } else if ("audio".equals(type)) {
                contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
            }

            final String selection = "_id=?";
            final String[] selectionArgs = new String[] {
                    split[1]
            };

            return getDataColumn(context, contentUri, selection, selectionArgs);
        }
    }
    // MediaStore (and general)
    else if ("content".equalsIgnoreCase(uri.getScheme())) {
        return getDataColumn(context, uri, null, null);
    }
    // File
    else if ("file".equalsIgnoreCase(uri.getScheme())) {
        return uri.getPath();
    }

    return null;
}

/**
 * Get the value of the data column for this Uri. This is useful for
 * MediaStore Uris, and other file-based ContentProviders.
 *
 * @param context The context.
 * @param uri The Uri to query.
 * @param selection (Optional) Filter used in the query.
 * @param selectionArgs (Optional) Selection arguments used in the query.
 * @return The value of the _data column, which is typically a file path.
 */
public static String getDataColumn(Context context, Uri uri, String selection,
                                   String[] selectionArgs) {

    Cursor cursor = null;
    final String column = "_data";
    final String[] projection = {
            column
    };

    try {
        cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
                null);
        if (cursor != null && cursor.moveToFirst()) {
            final int column_index = cursor.getColumnIndexOrThrow(column);
            return cursor.getString(column_index);
        }
    } finally {
        if (cursor != null)
            cursor.close();
    }
    return null;
}


/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is ExternalStorageProvider.
 */
public static boolean isExternalStorageDocument(Uri uri) {
    return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is DownloadsProvider.
 */
public static boolean isDownloadsDocument(Uri uri) {
    return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
 * @param uri The Uri to check.
 * @return Whether the Uri authority is MediaProvider.
 */
public static boolean isMediaDocument(Uri uri) {
    return "com.android.providers.media.documents".equals(uri.getAuthority());
}

日志文件：

10-19 15:30:24.549 12482-12482/com.onnurinet.andriodstb E/URI: /storage/emulated/0/WhatsApp/Media/WhatsApp Video

10-19 15：30：34.031 12482-12482 / com.onnurinet.andriodstb E / uri：content：// media / external / video / media / 36930 10-19 15：30：34.050 12482-12482 / com.onnurinet。 andriodstb E /路径：/ storage / sdcard1 / videos 10-19 15：30：34.050 12482-12482 / com.onnurinet.andriodstb D /媒体路径：/ storage / emulated / 0 / WhatsApp / Media / WhatsApp Video / VID-20161018- WA0001.3gp 10-19 15：30：34.069 12482-12482 / com.onnurinet.andriodstb D /意图路径列表：/ storage / sdcard1 / videos 10-19 15：30：34.128 12482-12482 / com.onnurinet.andriodstb D /网址：/ storage / sdcard1 / videos

请告诉我我尝试了两天的事情。

Answer 1

我认为该错误很容易解释。 没有可以处理特定意图的应用程序（实际上是活动）。 采用

if (intent.resolveActivity(getPackageManager()) != null) {

    startAFR(intent);

}else{
    //Log no activity found
    //Inform user via toast/snackbar etc
}

打开文件夹以选择视频文件

Intent intent = new Intent(Intent.ACTION_GET_CONTENT); 
Uri uri = Uri.parse(...); 
intent.setDataAndType(uri, "video/*");   
startActivity(Intent.createChooser(intent, "Open folder"));

Answer 2

每当使用ArrayList（path_list）时，都应该使用其索引来获取值，例如path_list.get(0).toString();

 final Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Video.Media.EXTERNAL_CONTENT_URI);
 intent.setData(Uri.parse(path_list.get(0).toString()));
 startActivityForResult(intent,152);

如果仍然有问题，请尝试以下一种

<activity android:name=".YourActivity">

    <action android:name="android.intent.action.VIEW" />
    <category android:name="android.intent.category.DEFAULT" />
    <category android:name="android.intent.category.BROWSABLE" />
    <data android:scheme="file" />
    <data android:mimeType="*/*" />
    <data android:pathPattern=".*\\.mp4" />

</activity>

还是您没有解决方案？ 然后请尝试以下之一

使用外部Android应用程序安全地打开文件，而无需将文件复制到外部存储中