Android开发（13）-- 互联网访问图片，在android客户端显示

1、布局界面

[html] view plaincopyprint?

1. <RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
2. xmlns:tools="http://schemas.android.com/tools"
3. android:layout_width="match_parent"
4. android:layout_height="match_parent"
5. android:paddingBottom="@dimen/activity_vertical_margin"
6. android:paddingLeft="@dimen/activity_horizontal_margin"
7. android:paddingRight="@dimen/activity_horizontal_margin"
8. android:paddingTop="@dimen/activity_vertical_margin"
9. tools:context=".MainActivity">
11. <EditText
12. android:id="@+id/url_text"
13. android:layout_width="wrap_content"
14. android:layout_height="wrap_content"
15. android:layout_alignParentLeft="true"
16. android:layout_alignParentRight="true"
17. android:layout_alignParentTop="true"
18. android:ems="10"
19. android:inputType="textPostalAddress"
20. android:text="@string/url_text">
22. <requestFocus />
23. </EditText>
25. <Button
26. android:id="@+id/btn_text"
27. android:layout_width="wrap_content"
28. android:layout_height="wrap_content"
29. android:layout_alignLeft="@+id/url_text"
30. android:layout_below="@+id/url_text"
31. android:layout_marginTop="32dp"
32. android:onClick="sendHttp"
33. android:text="@string/btn_text"/>
35. <ImageView
36. android:id="@+id/iv_ie"
37. android:layout_width="wrap_content"
38. android:layout_height="wrap_content"
39. android:layout_alignParentBottom="true"
40. android:layout_alignParentLeft="true"
41. android:layout_alignRight="@+id/url_text"
42. android:layout_below="@+id/btn_text"
43. android:src="@drawable/ic_launcher"/>
45. </RelativeLayout>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <EditText        android:id="@+id/url_text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentRight="true"        android:layout_alignParentTop="true"        android:ems="10"        android:inputType="textPostalAddress"        android:text="@string/url_text" >        <requestFocus />    </EditText>    <Button        android:id="@+id/btn_text"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/url_text"        android:layout_below="@+id/url_text"        android:layout_marginTop="32dp"        android:onClick="sendHttp"        android:text="@string/btn_text" />    <ImageView        android:id="@+id/iv_ie"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentBottom="true"        android:layout_alignParentLeft="true"        android:layout_alignRight="@+id/url_text"        android:layout_below="@+id/btn_text"        android:src="@drawable/ic_launcher" /></RelativeLayout>

2、封转的一些类

URL的封装：

[java] view plaincopyprint?

1. package com.example.lession08_code.utis;
3. import java.io.InputStream;
4. import java.net.HttpURLConnection;
5. import java.net.URL;
7. import android.graphics.Bitmap;
8. import android.graphics.BitmapFactory;
10. public class HttpUtils {
12. public static String sendGet(String path){
13. String content=null;
14. try{
15. //设置访问的url
16. URL url=new URL(path);
17. //打开请求
18. HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
19. //设置请求的信息
20. httpURLConnection.setRequestMethod("GET");
21. //设置请求是否超时
22. httpURLConnection.setConnectTimeout(5000);
23. //判断服务器是否响应成功
24. if(httpURLConnection.getResponseCode()==200){
25. //获取响应的输入流对象
26. InputStream is=httpURLConnection.getInputStream();
27. byte data[]=StreamTools.isTodata(is);
28. //把转换成字符串
29. content=new String(data);
30. //内容编码方式
31. if(content.contains("gb2312")){
32. content=new String(data,"gb2312");
33. }
34. }
35. //断开连接
36. httpURLConnection.disconnect();
37. }catch(Exception e){
38. e.printStackTrace();
39. }
41. return content;
42. }
45. public static Bitmap sendGets(String path){
46. Bitmap bitmap=null;
47. try{
48. //设置访问的url
49. URL url=new URL(path);
50. //打开请求
51. HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();
52. //设置请求的信息
53. httpURLConnection.setRequestMethod("GET");
54. //设置请求是否超时
55. httpURLConnection.setConnectTimeout(5000);
56. //判断服务器是否响应成功
57. if(httpURLConnection.getResponseCode()==200){
58. //获取响应的输入流对象
59. InputStream is=httpURLConnection.getInputStream();
60. //直接把is的流转换成Bitmap对象
61. bitmap=BitmapFactory.decodeStream(is);
62. }
63. //断开连接
64. httpURLConnection.disconnect();
65. }catch(Exception e){
66. e.printStackTrace();
67. }
69. return bitmap;
70. }
71. }

package com.example.lession08_code.utis;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import android.graphics.Bitmap;import android.graphics.BitmapFactory;public class HttpUtils {public static String sendGet(String path){String content=null;try{//设置访问的urlURL url=new URL(path);//打开请求HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();//设置请求的信息httpURLConnection.setRequestMethod("GET");//设置请求是否超时httpURLConnection.setConnectTimeout(5000);//判断服务器是否响应成功if(httpURLConnection.getResponseCode()==200){//获取响应的输入流对象InputStream is=httpURLConnection.getInputStream();byte data[]=StreamTools.isTodata(is);//把转换成字符串content=new String(data);//内容编码方式if(content.contains("gb2312")){content=new String(data,"gb2312");}}//断开连接httpURLConnection.disconnect();}catch(Exception e){e.printStackTrace();}return content;}public static Bitmap sendGets(String path){Bitmap bitmap=null;try{//设置访问的urlURL url=new URL(path);//打开请求HttpURLConnection httpURLConnection=(HttpURLConnection) url.openConnection();//设置请求的信息httpURLConnection.setRequestMethod("GET");//设置请求是否超时httpURLConnection.setConnectTimeout(5000);//判断服务器是否响应成功if(httpURLConnection.getResponseCode()==200){//获取响应的输入流对象InputStream is=httpURLConnection.getInputStream();//直接把is的流转换成Bitmap对象bitmap=BitmapFactory.decodeStream(is);}//断开连接httpURLConnection.disconnect();}catch(Exception e){e.printStackTrace();}return bitmap;}}

判断网络是否连接的封装类

[java] view plaincopyprint?

1. package com.example.lession08_code.utis;
3. import android.app.AlertDialog;
4. import android.content.ComponentName;
5. import android.content.Context;
6. import android.content.DialogInterface;
7. import android.content.Intent;
8. import android.net.ConnectivityManager;
9. import android.net.NetworkInfo;
10. import android.widget.Toast;
12. public class NetWorkUtils {
14. private Context context;
16. // 网路链接管理对象
17. public ConnectivityManager connectivityManager;
19. public NetWorkUtils(Context context) {
20. this.context = context;
21. // 获取网络链接的对象
22. connectivityManager = (ConnectivityManager) context
23. .getSystemService(Context.CONNECTIVITY_SERVICE);
24. }
26. public boolean setActiveNetWork() {
27. boolean flag=false;
28. // 获取可用的网络链接对象
29. NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
30. if (networkInfo == null) {
31. new AlertDialog.Builder(context)
32. .setTitle("网络不可用")
33. .setMessage("可以设置网络?")
34. .setPositiveButton("确认",
35. new DialogInterface.OnClickListener() {
36. @Override
37. public void onClick(DialogInterface dialog,
38. int which) {
39. Toast.makeText(context, "点击确认",
40. Toast.LENGTH_LONG).show();
43. // 声明意图
44. Intent intent = new Intent();
45. intent.setAction(Intent.ACTION_MAIN);
46. intent.addCategory("android.intent.category.LAUNCHER");
47. intent.setComponent(new ComponentName(
48. "com.android.settings",
49. "com.android.settings.Settings"));
50. intent.setFlags(0x10200000);
51. // 执行意图
52. context.startActivity(intent);
54. }
56. })
57. .setNegativeButton("取消",
58. new DialogInterface.OnClickListener() {
60. @Override
61. public void onClick(DialogInterface dialog,
62. int which) {
63. }
65. }).show();// 必须.show();
67. }
69. if(networkInfo!=null){
70. flag=true;
71. }
73. return flag;
74. }
75. }

package com.example.lession08_code.utis;import android.app.AlertDialog;import android.content.ComponentName;import android.content.Context;import android.content.DialogInterface;import android.content.Intent;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.widget.Toast;public class NetWorkUtils {private Context context;// 网路链接管理对象public ConnectivityManager connectivityManager;public NetWorkUtils(Context context) {this.context = context;// 获取网络链接的对象connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);}public boolean setActiveNetWork() {boolean flag=false;// 获取可用的网络链接对象NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();if (networkInfo == null) {new AlertDialog.Builder(context).setTitle("网络不可用").setMessage("可以设置网络?").setPositiveButton("确认",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {Toast.makeText(context, "点击确认",Toast.LENGTH_LONG).show();// 声明意图Intent intent = new Intent();intent.setAction(Intent.ACTION_MAIN);intent.addCategory("android.intent.category.LAUNCHER");intent.setComponent(new ComponentName("com.android.settings","com.android.settings.Settings"));intent.setFlags(0x10200000);// 执行意图context.startActivity(intent);}}).setNegativeButton("取消",new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog,int which) {}}).show();// 必须.show();}if(networkInfo!=null){flag=true;}return flag;}}

输出流的封装类

[java] view plaincopyprint?

1. package com.example.lession08_code.utis;
3. import java.io.ByteArrayOutputStream;
4. import java.io.IOException;
5. import java.io.InputStream;
7. public class StreamTools {
9. public staticbyte[] isTodata(InputStream is) throws IOException{
10. //字节输出流
11. ByteArrayOutputStream bops=new ByteArrayOutputStream();
12. //读取数据的缓冲区
13. byte buffer[]=newbyte[1024];
14. //读取记录的长度
15. int len=0;
16. while((len=is.read(buffer))!=-1){
17. bops.write(buffer, 0, len);
18. }
19. //把读取的内容转换成byte数组
20. byte data[]=bops.toByteArray();
21. return data;
22. }
23. }

package com.example.lession08_code.utis;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;public class StreamTools {public static byte[] isTodata(InputStream is) throws IOException{//字节输出流ByteArrayOutputStream bops=new ByteArrayOutputStream();//读取数据的缓冲区byte buffer[]=new byte[1024];//读取记录的长度int len=0;while((len=is.read(buffer))!=-1){bops.write(buffer, 0, len);}//把读取的内容转换成byte数组byte data[]=bops.toByteArray();return data;}}

注意：在这里还需要加权限问题

[java] view plaincopyprint?

1. <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
2. <uses-permission android:name="android.permission.INTERNET"/>

 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.INTERNET"/>