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Android 通过网络获取图片的代码

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Android 通过网络获取图片的代码 主activity```java package com.netimg;

import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast;

public class AndroidnetimgActivity extends Activity { /* Called when the activity is first created. / //定义所使用的组件 private Button button; private EditText editText; private ImageView imagesView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    //实例化用到的组件
    editText =(EditText)findViewById(R.id.EditText);
    imagesView = (ImageView)findViewById(R.id.ImageView);
    button = (Button)findViewById(R.id.Button);

    //为按钮添加监听事件
    button.setOnClickListener(new buttonListener());

}

private final class buttonListener implements OnClickListener{

    @Override
    public void onClick(View v) {
        String path = editText.getText().toString();

        System.out.println(path);

        //通过业务类ImageService的getImage方法得到数据
        try {
            byte[] data = ImageService.getImage(path);
            Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            imagesView.setImageBitmap(bitmap);//显示图片
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            Toast.makeText(getApplicationContext(), "获取失败", 1).show();
        }

    }

}

}

业务类java package com.netimg;

import java.io.InputStream; import java.net.HttpURLConnection; import java.net.URL;

public class ImageService {

public static byte[] getImage(String path) throws Exception {

    URL url = new URL(path);
    //基于HTTP协议连接对象
    HttpURLConnection conn = (HttpURLConnection)url.openConnection();

    conn.setConnectTimeout(5000);
    conn.setRequestMethod("GET");

    if(conn.getResponseCode() == 200){
        InputStream inStream = conn.getInputStream();
        return StreamTool.read(inStream);
    }

    return null;
}

}

工具类java package com.netimg;

import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream;

public class StreamTool {

public static byte[] read(InputStream inStream) throws IOException {
    ByteArrayOutputStream outStream = new ByteArrayOutputStream();
    byte[] buffer = new byte[1024];
    int len = 0;
    while( (len = inStream.read(buffer)) != -1){
        outStream.write(buffer, 0, len);
    }
    inStream.close();
    return outStream.toByteArray();
}

} 获取网络权限java <uses-permission android:name="android.permission.INTERNET"/> ```

标签:java

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