andriod之ContentProvider读取外部存储视屏

主显示布局以及代码&＃xff1a;

activity_main.xml&＃xff1a;

主Activity的java代码&＃xff1a;

package com.sxt.day07_09;


import java.util.ArrayList;
import java.util.HashMap;


import android.app.Activity;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.provider.MediaStore.Video;
import android.provider.MediaStore.Video.Thumbnails;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Gallery;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.VideoView;


public class MainActivity extends Activity {
ArrayList> mVideos;
Gallery mGallery;//横向显示列表
VideoAdapter mAdapter;//适配器
VideoView mVideoView;//播放视屏的ui
&＃64;Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getVideoInfo();
initView();
setListener();
}


private void setListener() {
mGallery.setOnItemClickListener(new OnItemClickListener() {


&＃64;Override
public void onItemClick(AdapterView parent, View view,
int position, long id) {
HashMap video&＃61;mVideos.get(position);
String path&＃61;video.get(Video.Media.DATA).toString();
mVideoView.setVideoPath(path);
mVideoView.start();
}
});
}


private void initView() {
mVideoView&＃61;(VideoView) findViewById(R.id.vv);
mGallery&＃61;(Gallery) findViewById(R.id.gallery);
mAdapter&＃61;new VideoAdapter(mVideos, this);
mGallery.setAdapter(mAdapter);
}


private void getVideoInfo() {
ContentResolver resolver &＃61; getContentResolver();
String[] projection&＃61;{
Video.Media._ID,
Video.Media.DATA,
Video.Media.TITLE
};
mVideos&＃61;new ArrayList>();
Cursor c &＃61; resolver.query(Video.Media.EXTERNAL_CONTENT_URI, projection, null, null, null);
while(c.moveToNext()){
HashMap video&＃61;new HashMap();
video.put(Video.Media._ID, c.getInt(c.getColumnIndex(Video.Media._ID)));
video.put(Video.Media.DATA, c.getString(c.getColumnIndex(Video.Media.DATA)));
video.put(Video.Media.TITLE, c.getString(c.getColumnIndex(Video.Media.TITLE)));
mVideos.add(video);
}
}


class VideoAdapter extends BaseAdapter{
ArrayList> videos;
Context context;

public VideoAdapter(ArrayList> videos,
Context context) {
super();
this.videos &＃61; videos;
this.context &＃61; context;
}


&＃64;Override
public int getCount() {
return videos.size();
}


&＃64;Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}


&＃64;Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}


&＃64;Override
public View getView(int position, View layout, ViewGroup parent) {
layout&＃61;View.inflate(context, R.layout.item_video, null);
ImageView ivThumb&＃61;(ImageView) layout.findViewById(R.id.ivThumb);
TextView tvTitle&＃61;(TextView) layout.findViewById(R.id.tvTitle);
HashMap video&＃61;videos.get(position);
tvTitle.setText(video.get(Video.Media.TITLE).toString());
int id&＃61;(Integer) video.get(Video.Media._ID);
Bitmap bm&＃61;Thumbnails.getThumbnail(getContentResolver(), id, Thumbnails.MICRO_KIND, null);
ivThumb.setImageBitmap(bm);
return layout;
}
}
}

适配的布局&＃xff1a;item_video.xml

    android:layout_width&＃61;"wrap_content"
    android:layout_height&＃61;"wrap_content"
    android:orientation&＃61;"vertical" >
    
   android:id&＃61;"&＃64;&＃43;id/ivThumb"
   android:layout_width&＃61;"80dp"
   android:layout_height&＃61;"80dp"
   android:src&＃61;"&＃64;drawable/ic_launcher"/>
   android:id&＃61;"&＃64;&＃43;id/tvTitle"
   android:layout_width&＃61;"80dp"
   android:layout_height&＃61;"wrap_content"
   android:text&＃61;"安卓"
   android:gravity&＃61;"center_horizontal"/>