[java] view plain copy

1. packagecom.xplus.mytxttest;
3. importjava.io.ByteArrayOutputStream;
4. importjava.io.File;
5. importjava.io.FileInputStream;
6. importjava.io.FileNotFoundException;
7. importjava.io.FileOutputStream;
8. importjava.io.IOException;
9. importjava.io.InputStream;
11. importandroid.app.Activity;
12. importandroid.content.Context;
13. importandroid.graphics.Bitmap;
14. importandroid.graphics.BitmapFactory;
15. importandroid.os.Bundle;
16. importandroid.os.Environment;
17. importandroid.view.View;
18. importandroid.view.View.OnClickListener;
19. importandroid.widget.Button;
20. importandroid.widget.EditText;
21. importandroid.widget.ImageView;
22. importandroid.widget.TextView;
23. importandroid.widget.Toast;
25. publicclassActivitySdCardextendsActivity{
27. privateButtonbtn_write;
28. privateButtonbtn_read;
29. privateEditTextedit_write;
30. privateTextViewview_read;
31. privateTextViewtext_info;
33. privateImageViewimg_image1;
34. privateImageViewimg_image2;
35. privateImageViewimg_image3;
36. privateImageViewimg_image4;
37. privateImageViewimg_image5;
38. privateTextViewtext_image1;
39. privateTextViewtext_image2;
40. privateTextViewtext_image3;
41. privateTextViewtext_image4;
42. privateTextViewtext_image5;
43. privateintflag=0;
46. @Override
47. protectedvoidonCreate(BundlesavedInstanceState){
48. //TODOAuto-generatedmethodstub
49. super.onCreate(savedInstanceState);
50. setContentView(R.layout.main_sd);
51. init();
53. System.out.println("CodeEncoding:"+getCodeEncoding());
55. if(Environment.getExternalStorageState().equals(
56. Environment.MEDIA_MOUNTED)){
57. Filefile=newFile(Environment.getExternalStorageDirectory(),
58. "my.txt");
59. try{
60. FileInputStreaminStream=newFileInputStream(file);
61. //内存中开辟一段缓冲区
62. byte[]buffer=newbyte[1024];
63. //创建一个字节输出流
64. ByteArrayOutputStreamoutStream=newByteArrayOutputStream();
65. //读取出来的数据首先放入缓冲去，，满了之后再写到字符输出流
66. intlen;
67. while((len=inStream.read(buffer))!=-1){
68. outStream.write(buffer,0,len);
69. }
70. inStream.close();
71. outStream.close();
72. System.out.println(outStream.toString());
73. String[]arrStr=outStream.toString().split("-");
74. queryPic(arrStr);
75. }
76. catch(Exceptione){
77. //TODO:handleexception
78. }
81. btn_read.setOnClickListener(newOnClickListener(){
82. @Override
83. publicvoidonClick(Viewv){
84. try{
85. FilesdCardDir=Environment
86. .getExternalStorageDirectory();
87. System.out.println(sdCardDir.toString());
88. if(Environment.getExternalStorageState().equals(
89. Environment.MEDIA_MOUNTED)){
90. FilereadFile=newFile(sdCardDir,"my.txt");
91. FileInputStreamistream=newFileInputStream(
92. readFile);
93. //内存中开辟一段缓冲区
94. byte[]buffer=newbyte[1024];
95. //创建一个字节输出流
96. ByteArrayOutputStreamostream=newByteArrayOutputStream();
97. //读取出来的数据首先放入缓冲去，，满了之后再写到字符输出流
98. intlen;
99. while((len=istream.read(buffer))!=-1){
100. ostream.write(buffer,0,len);
101. }
102. ostream.close();
103. istream.close();
104. StringtxtStr=ostream.toString();
105. view_read.setText(txtStr);
106. }
107. }catch(FileNotFoundExceptione){
108. //TODOAuto-generatedcatchblock
109. e.printStackTrace();
110. }catch(IOExceptione){
111. //TODOAuto-generatedcatchblock
112. e.printStackTrace();
113. }
114. }
115. });
117. btn_write.setOnClickListener(newOnClickListener(){
118. @Override
119. publicvoidonClick(Viewv){
120. try{
121. System.out.println("write");
122. FilesdCardDir=Environment
123. .getExternalStorageDirectory();
124. System.out.println(Environment
125. .getExternalStorageState());
126. if(Environment.getExternalStorageState().equals(
127. Environment.MEDIA_MOUNTED)){
128. System.out.println("write");
129. FilesaveFile=newFile(sdCardDir,"my.txt");
130. FileOutputStreamfos=newFileOutputStream(
131. saveFile);
132. fos.write(edit_write.getText().toString()
133. .getBytes());
135. fos.close();
136. Toast.makeText(ActivitySdCard.this,"写入成功",
137. Toast.LENGTH_SHORT).show();
138. }
140. }catch(FileNotFoundExceptione){
141. //TODOAuto-generatedcatchblock
142. e.printStackTrace();
143. }catch(IOExceptione){
144. //TODOAuto-generatedcatchblock
145. e.printStackTrace();
146. }
148. }
149. });
150. }
152. }
154. privatevoidinit(){
155. btn_read=(Button)findViewById(R.id.button_sd_read);
156. btn_write=(Button)findViewById(R.id.button_sd_write);
157. edit_write=(EditText)findViewById(R.id.editText_sd_edit);
158. view_read=(TextView)findViewById(R.id.textView_sd_text);
159. text_info=(TextView)findViewById(R.id.textView_sd_info);
161. img_image1=(ImageView)findViewById(R.id.imageView_sd_image1);
162. img_image2=(ImageView)findViewById(R.id.imageView_sd_image2);
163. img_image3=(ImageView)findViewById(R.id.imageView_sd_image3);
164. img_image4=(ImageView)findViewById(R.id.imageView_sd_image4);
165. img_image5=(ImageView)findViewById(R.id.imageView_sd_image5);
166. text_image1=(TextView)findViewById(R.id.textView_sd_text1);
167. text_image2=(TextView)findViewById(R.id.textView_sd_text2);
168. text_image3=(TextView)findViewById(R.id.textView_sd_text3);
169. text_image4=(TextView)findViewById(R.id.textView_sd_text4);
170. text_image5=(TextView)findViewById(R.id.textView_sd_text5);
172. }
174. privatevoidqueryPic(String[]str){
175. img_image1.setImageBitmap(BitmapFactory.decodeFile(str[flag]));
176. text_image1.setText("名称："+str[++flag]+"\n价格："+str[++flag]);
177. img_image2.setImageBitmap(BitmapFactory.decodeFile(str[++flag]));
178. text_image2.setText("名称："+str[++flag]+"\n价格："+str[++flag]);
179. img_image3.setImageBitmap(BitmapFactory.decodeFile(str[++flag]));
180. text_image3.setText("名称："+str[++flag]+"\n价格："+str[++flag]);
181. img_image4.setImageBitmap(BitmapFactory.decodeFile(str[++flag]));
182. text_image4.setText("名称："+str[++flag]+"\n价格："+str[++flag]);
183. img_image5.setImageBitmap(BitmapFactory.decodeFile(str[++flag]));
184. text_image5.setText("名称："+str[++flag]+"\n价格："+str[++flag]);
185. }
187. privateStringgetCodeEncoding(){
188. Stringcode="gb2312";
189. try{
190. InputStreaminputStream=newFileInputStream(
191. Environment.getExternalStorageDirectory()+"/my.txt");
192. byte[]head=newbyte[3];
193. inputStream.read(head);
194. if(head[0]==-1&&head[1]==-2){
195. code="UTF-16";
196. }
197. if(head[0]==-2&&head[1]==-1){
198. code="Unicode";
199. }
200. if(head[0]==-17&&head[1]==-69&&head[2]==-65){
201. code="UTF-8";
202. }
204. }catch(FileNotFoundExceptione){
205. //TODOAuto-generatedcatchblock
206. e.printStackTrace();
207. }catch(IOExceptione){
208. //TODOAuto-generatedcatchblock
209. e.printStackTrace();
210. }
212. returncode;
213. }
215. @Override
216. protectedvoidonDestroy(){
217. //TODOAuto-generatedmethodstub
218. super.onDestroy();
219. }
221. }

xml

[html] view plain copy

1. <?xmlversion="1.0"encoding="utf-8"?>
2. <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical">
6. <LinearLayout
7. android:layout_width="match_parent"
8. android:layout_height="wrap_content">
9. <Button
10. android:id="@+id/button_sd_write"
11. android:layout_width="wrap_content"
12. android:layout_height="wrap_content"
13. android:text="write"/>
14. <Button
15. android:id="@+id/button_sd_read"
16. android:layout_width="wrap_content"
17. android:layout_height="wrap_content"
18. android:text="read"/>
19. </LinearLayout>
20. <LinearLayout
21. android:layout_width="match_parent"
22. android:layout_height="wrap_content">
23. <EditText
24. android:id="@+id/editText_sd_edit"
25. android:layout_width="wrap_content"
26. android:layout_height="wrap_content"
27. android:layout_weight="1"
28. android:ems="10"
29. android:inputType="textPersonName">
30. <requestFocus/>
31. </EditText>
32. </LinearLayout>
33. <TextView
34. android:id="@+id/textView_sd_text"
35. android:layout_width="wrap_content"
36. android:layout_height="wrap_content"
37. android:text="读取的内容"/>
38. <LinearLayout
39. android:layout_width="match_parent"
40. android:layout_height="wrap_content"
41. android:orientation="vertical">
42. <TableLayout
43. android:layout_width="wrap_content"
44. android:layout_height="wrap_content"
45. android:layout_gravity="center">
46. <TableRow
47. android:id="@+id/tableRow1"
48. android:layout_width="wrap_content"
49. android:layout_height="wrap_content">
50. <ImageView
51. android:id="@+id/imageView_sd_image1"
52. android:layout_width="wrap_content"
53. android:layout_height="wrap_content"
54. android:src="@drawable/ic_action_search"/>
55. <ImageView
56. android:id="@+id/imageView_sd_image2"
57. android:layout_width="wrap_content"
58. android:layout_height="wrap_content"
59. android:src="@drawable/ic_action_search"/>
60. <ImageView
61. android:id="@+id/imageView_sd_image3"
62. android:layout_width="wrap_content"
63. android:layout_height="wrap_content"
64. android:src="@drawable/ic_action_search"/>
65. <ImageView
66. android:id="@+id/imageView_sd_image4"
67. android:layout_width="wrap_content"
68. android:layout_height="wrap_content"
69. android:src="@drawable/ic_action_search"/>
70. <ImageView
71. android:id="@+id/imageView_sd_image5"
72. android:layout_width="wrap_content"
73. android:layout_height="wrap_content"
74. android:src="@drawable/ic_action_search"/>
75. </TableRow>
76. <TableRow
77. android:id="@+id/tableRow2"
78. android:layout_width="wrap_content"
79. android:layout_height="wrap_content">
80. <TextView
81. android:id="@+id/textView_sd_text1"
82. android:layout_width="wrap_content"
83. android:layout_height="wrap_content"
84. android:layout_gravity="center"
85. android:text="1"
86. android:textSize="20dip"/>
87. <TextView
88. android:id="@+id/textView_sd_text2"
89. android:layout_width="wrap_content"
90. android:layout_height="wrap_content"
91. android:layout_gravity="center"
92. android:text="2"
93. android:textSize="20dip"/>
94. <TextView
95. android:id="@+id/textView_sd_text3"
96. android:layout_width="wrap_content"
97. android:layout_height="wrap_content"
98. android:layout_gravity="center"
99. android:text="3"
100. android:textSize="20dip"/>
101. <TextView
102. android:id="@+id/textView_sd_text4"
103. android:layout_width="wrap_content"
104. android:layout_height="wrap_content"
105. android:layout_gravity="center"
106. android:text="4"
107. android:textSize="20dip"/>
108. <TextView
109. android:id="@+id/textView_sd_text5"
110. android:layout_width="wrap_content"
111. android:layout_height="wrap_content"
112. android:layout_gravity="center"
113. android:text="5"
114. android:textSize="20dip"/>
115. </TableRow>
116. </TableLayout>
117. </LinearLayout>
118. <TextView
119. android:id="@+id/textView_sd_info"
120. android:layout_width="wrap_content"
121. android:layout_height="wrap_content"
122. android:layout_gravity="center"
123. android:text="图片描述信息"/>
125. </LinearLayout>

如果要读取txt中的信息，可以用BufferedReader实现一行一行的读取，然后将读取的数据添加到一个List中，再通过List获取需要的数据即可。

[java] view plain copy

1. Filefile=newFile(firstPath+secondPath+thirdPath[flag],
2. "/akinndo.txt");
4. BufferedReaderreader=newBufferedReader(newFileReader(file));
5. Stringr=reader.readLine();
6. while(r!=null){
7. String[]informations=r.split(",");
8. Map<String,String>map=newHashMap<String,String>();
9. map.put("dir",firstPath+informations[0]);
10. map.put("description",informations[1]);
11. list.add(map);
12. r=reader.readLine();
13. }

更多相关文章

1. Android得到SD卡文件夹大小以及删除文件夹操作
2. android读取扫码模组数据的方法
3. Android判断下载File是否为apk文件
4. android 读取资源字符串的 方法
5. Android(安卓)获取手机号码
6. Android(安卓)读取sdcard指定目录文件
7. Android从远程服务器下载文件到本地sd卡中
8. （转）Android软件测试的日志文件抓取简介
9. 读取Activity/Processes的PID（Android）

随机推荐

1. react-native 修改app应用名称
2. Android，APP图标尺寸
3. Android在putString和getString使用方法
4. Android(安卓)号码, 来电归属地 Jni 使用
5. java获取http:图片下载代码——android基
6. Android(安卓)makefile 组织结构
7. android 源码分享
8. LEADTOOLS Android的入门使用方法
9. Android(安卓)Fragment详解(四)：管理Fragm
10. Android(安卓)SDK Manager顺利下载