android从资产文件夹中共享图像 [英] android share images from assets folder

问题描述

我正在尝试共享我的资产文件夹中的图像.我的代码是:

I'm trying to share an image from my assets folder. My code is:

Intent share = new Intent(Intent.ACTION_SEND);
share.setType("image/jpg");
share.putExtra(Intent.EXTRA_STREAM, Uri.parse("file:///assets/myImage.jpg"));
startActivity(Intent.createChooser(share, "Share This Image"));

但它不起作用.你有什么想法吗?

but it doesn't work. Do you have any ideas?

推荐答案

补充 @intrepidis 回答:

您将需要覆盖方法，例如上面的示例类:

You will need override methods like example class above:

package com.android.example;

import android.content.ContentProvider;
import android.net.Uri;
import android.content.res.AssetFileDescriptor;
import android.content.res.AssetManager;
import java.io.FileNotFoundException;
import android.content.ContentValues;
import android.database.Cursor;
import java.io.IOException;
import android.os.CancellationSignal;

public class AssetsProvider extends ContentProvider
{

        @Override
        public AssetFileDescriptor openAssetFile( Uri uri, String mode ) throws FileNotFoundException
        {
                Log.v( TAG, "AssetsGetter: Open asset file" );
                AssetManager am = getContext( ).getAssets( );
                String file_name = uri.getLastPathSegment( );
                if( file_name == null )
                        throw new FileNotFoundException( );
                AssetFileDescriptor afd = null;
                try
                {
                        afd = am.openFd( file_name );
                }
                catch(IOException e)
                {
                        e.printStackTrace( );
                }
                return afd;//super.openAssetFile(uri, mode);
        }

        @Override
        public String getType( Uri p1 )
        {
                // TODO: Implement this method
                return null;
        }

        @Override
        public int delete( Uri p1, String p2, String[] p3 )
        {
                // TODO: Implement this method
                return 0;
        }

        @Override
        public Cursor query( Uri p1, String[] p2, String p3, String[] p4, String p5 )
        {
                // TODO: Implement this method
                return null;
        }

        @Override
        public Cursor query( Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder, CancellationSignal cancellationSignal )
        {
                // TODO: Implement this method
                return super.query( uri, projection, selection, selectionArgs, sortOrder, cancellationSignal );
        }

        @Override
        public Uri insert( Uri p1, ContentValues p2 )
        {
                // TODO: Implement this method
                return null;
        }

        @Override
        public boolean onCreate( )
        {
                // TODO: Implement this method
                return false;
        }

        @Override
        public int update( Uri p1, ContentValues p2, String p3, String[] p4 )
        {
                // TODO: Implement this method
                return 0;
        }
}

我需要重写两次查询方法.并在您的 androidmanifest.xml 标签上方添加这些行:

I needed to override two times the query method. And add these lines above tag in your androidmanifest.xml:

<provider
  android:name="com.android.example.AssetsProvider"
  android:authorities="com.android.example"
  android:grantUriPermissions="true"
  android:exported="true" />

有了这个，一切都像一个魅力:D

And with this, all work like a charm :D

这篇关于android从资产文件夹中共享图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！