本文共 4363 字,大约阅读时间需要 14 分钟。
1:androidmanifest.xml的内容
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="cn.capinftotech.image"
- android:versionCode="1"
- android:versionName="1.0">
- <application android:icon="@drawable/icon" android:label="@string/app_name">
- <activity android:name=".MainActivity"
- android:label="@string/app_name">
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
-
- </application>
- <uses-sdk android:minSdkVersion="8" />
- <uses-permission android:name="android.permission.INTERNET" />
-
- </manifest>
注意访问网络中的数据需要添加android.permission.INTERNET权限
2:MainActivity的内容
- package cn.capinftotech.image;
-
- import java.io.IOException;
-
- import android.app.Activity;
- import android.graphics.Bitmap;
- import android.graphics.BitmapFactory;
- import android.os.Bundle;
- import android.util.Log;
- import android.view.View;
- import android.widget.Button;
- import android.widget.EditText;
- import android.widget.ImageView;
- import android.widget.Toast;
-
- import com.capinfotech.service.ImageService;
-
- public class MainActivity extends Activity {
- private static final String TAG = "MainActivity";
-
- private EditText urlPath = null;
- private Button button = null;
- private ImageView imageView = null;
-
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-
- urlPath = (EditText)findViewById(R.id.urlpath);
- button = (Button)findViewById(R.id.button);
- imageView = (ImageView)findViewById(R.id.imageView);
-
- button.setOnClickListener(new View.OnClickListener() {
-
- @Override
- public void onClick(View v) {
- String urlPathContent = urlPath.getText().toString();
- try {
- byte[] data = ImageService.getImage(urlPathContent);
- Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
- imageView.setImageBitmap(bitmap);
- } catch (IOException e) {
- Toast.makeText(MainActivity.this, R.string.error, Toast.LENGTH_LONG).show();
- Log.i(TAG, e.toString());
- }
-
- }
- });
- }
- }
3:ImageService类的内容
- package com.capinfotech.service;
-
- import java.io.IOException;
- import java.io.InputStream;
- import java.net.HttpURLConnection;
- import java.net.URL;
-
- import com.capinfotech.utils.StreamTool;
-
- public class ImageService {
-
- public static byte[] getImage(String path) throws IOException {
- URL url = new URL(path);
- HttpURLConnection conn = (HttpURLConnection)url.openConnection();
- conn.setRequestMethod("GET");
- conn.setReadTimeout(5*1000);
- InputStream inputStream = conn.getInputStream();
- byte[] data = StreamTool.readInputStream(inputStream);
- return data;
-
- }
- }
4:StreamTool的内容
- package com.capinfotech.utils;
-
- import java.io.ByteArrayOutputStream;
- import java.io.IOException;
- import java.io.InputStream;
-
- public class StreamTool {
-
-
-
-
- public static byte[] readInputStream(InputStream inputStream) throws IOException {
- byte[] buffer = new byte[1024];
- int len = 0;
- ByteArrayOutputStream bos = new ByteArrayOutputStream();
- while((len = inputStream.read(buffer)) != -1) {
- bos.write(buffer, 0, len);
- }
- bos.close();
- return bos.toByteArray();
-
- }
- }
5:程序中用到的字符串资源strings.xml里的内容
- <?xml version="1.0" encoding="utf-8"?>
- <resources>
- <string name="hello">Hello World, MainActivity!</string>
- <string name="app_name">图片浏览器</string>
- <string name="urlpath">网络图片地址</string>
- <string name="button">显示</string>
- <string name="error">网络连接超时</string>
- </resources>
6:程序布局文件main.xml的内容
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="@string/urlpath"
- />
- <EditText
- android:id="@+id/urlpath"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:text="http://www.eoeandroid.com/data/attachment/forum/201107/18/142935bbi8d3zpf3d0dd7z.jpg"
- />
- <Button
- android:id="@+id/button"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="@string/button"
- />
- <ImageView
- android:id="@+id/imageView"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- />
- </LinearLayout>
7:程序界面及测试结果
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