Android 視頻縮略圖之 MediaStore

首先 聲明MediaStore是2.0以後才有的類

Android 視頻縮略圖之 MediaStore代碼下載：

免費下載地址在 http://linux.linuxidc.com/

用戶名與密碼都是www.linuxidc.com

具體下載目錄在 /pub/Android源碼集錦/2011年/12月/Android 視頻縮略圖之 MediaStore/

listview.xml如下

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="horizontal"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent"
6. >
7. <ImageView
8. android:layout_width="wrap_content"
9. android:layout_height="wrap_content"
10. android:id="@+id/iv"
11. />
12. <TextView
13. android:layout_width="fill_parent"
14. android:layout_height="wrap_content"
15. android:id="@+id/tv"
16. />
17. </LinearLayout>

1、

1. package com.lp;
3. import java.util.ArrayList;
5. import android.app.ListActivity;
6. import android.content.Context;
7. import android.database.Cursor;
8. import android.net.Uri;
9. import android.os.Bundle;
10. import android.provider.MediaStore;
11. import android.view.LayoutInflater;
12. import android.view.View;
13. import android.view.ViewGroup;
14. import android.widget.BaseAdapter;
15. import android.widget.ImageView;
16. import android.widget.TextView;
17. /**
18. * 本實例，我們將通過檢索SDCard上的Video信息
19. * 在MediaStore中，MediaStore.Video.Media中就有Video相關信息，
20. * 同時MediaStore.Video.Thumbnails中含有各個video對應的縮略圖信息
21. *
22. * @author Administrator
23. *
24. */
25. public class MainActivity extends ListActivity {
27. private Cursor cursor;
28. private ArrayList<VideoInfo> videoList = new ArrayList<MainActivity.VideoInfo>();
29. private ImageView img;
31. public void onCreate(Bundle savedInstanceState){
32. super.onCreate(savedInstanceState);
33. init();
34. }
37. private void init(){
38. String[] thumbColumns = new String[]{
39. MediaStore.Video.Thumbnails.DATA,
40. MediaStore.Video.Thumbnails.VIDEO_ID
41. };
43. String[] mediaColumns = new String[]{
44. MediaStore.Video.Media.DATA,
45. MediaStore.Video.Media._ID,
46. MediaStore.Video.Media.TITLE,
47. MediaStore.Video.Media.MIME_TYPE
48. };
50. //首先檢索SDcard上所有的video
51. cursor = this.managedQuery(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, mediaColumns, null, null, null);
54. while(cursor.moveToNext()){
55. VideoInfo info = new VideoInfo();
57. info.filePath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.DATA));
58. info.mimeType = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.MIME_TYPE));
59. info.title = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Media.TITLE));
61. //獲取當前Video對應的Id，然後根據該ID獲取其Thumb
62. int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Video.Media._ID));
63. String selection = MediaStore.Video.Thumbnails.VIDEO_ID +"=?";
64. String[] selectionArgs = new String[]{
65. id+""
66. };
67. Cursor thumbCursor = this.managedQuery(MediaStore.Video.Thumbnails.EXTERNAL_CONTENT_URI, thumbColumns, selection, selectionArgs, null);
69. if(thumbCursor.moveToFirst()){
70. info.thumbPath = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Video.Thumbnails.DATA));
72. }
73. //然後將其加入到videoList
74. videoList.add(info);
76. }
77. System.out.println(videoList.size());
78. //然後需要設置ListView的Adapter了，使用我們自定義的Adatper
79. VideoAdapter adapter = new VideoAdapter(this);
80. this.getListView().setAdapter(adapter);
81. }
84. class VideoInfo{
85. String filePath;
86. String mimeType;
87. String thumbPath;
88. String title;
89. }
91. class ViewHolder{
92. ImageView thumbImage;
93. TextView titleText;
94. }
96. /**
97. * 定義一個Adapter來顯示縮略圖和視頻title信息
98. * @author Administrator
99. *
100. */
101. private class VideoAdapter extends BaseAdapter{
103. private Context mContext;
104. private LayoutInflater inflater;
106. public VideoAdapter(Context context){
107. this.mContext = context;
108. this.inflater = LayoutInflater.from(context);
109. this.inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
110. }
111. @Override
112. public int getCount() {
113. // TODO Auto-generated method stub
114. return videoList.size();
115. }
116. @Override
117. public Object getItem(int p) {
118. // TODO Auto-generated method stub
119. return videoList.get(p);
120. }
121. @Override
122. public long getItemId(int p) {
123. // TODO Auto-generated method stub
124. return p;
125. }
126. @Override
127. public View getView(int position, View convertView, ViewGroup parent) {
128. ViewHolder holder ;
129. if(convertView == null){
130. holder = new ViewHolder();
131. convertView = inflater.inflate(R.layout.listview, null);
132. holder.thumbImage = (ImageView)convertView.findViewById(R.id.iv);
133. holder.titleText = (TextView)convertView.findViewById(R.id.tv);
134. convertView.setTag(holder);
135. }else{
136. holder = (ViewHolder)convertView.getTag();
137. }
139. //顯示信息
140. holder.titleText.setText(videoList.get(position).title);
141. if(videoList.get(position).thumbPath != null){
142. holder.thumbImage.setImageURI(Uri.parse(videoList.get(position).thumbPath));
143. }
145. return convertView;
146. }
148. }
149. }