网络图片获取

首先建立布局文件，main.xml,结构很简单，就一个输入框和一个按钮；

代码实现：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns: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="请输入地址："/>
    <EditText
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:text=""
     android:id="@+id/et_path"
     android:hint="请输入地址"/>
     <Button
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="查看图片"
     android:id="@+id/bt_showpic"/>
     <ImageView
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:id="@+id/iv_pic"/>
</LinearLayout>

接着创建一个工具类来处理图片请求，获取图片；
ImageUtil.java

public class ImageUtil {
    public static Bitmap getBitmap(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5000);
        conn.setRequestMethod("GET");
        if (conn.getResponseCode()==200) {
            InputStream iS = conn.getInputStream();
            Bitmap bitmap = BitmapFactory.decodeStream(iS);
            return bitmap;
        }
        return null;
    }
}

主Activity类：
getPicFromNetActivity.java

public class getPicFromNetActivity extends Activity implements OnClickListener {
    EditText et_path;
    Button bt_showpic;
    ImageView iv_pic;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //初始化参数
        et_path = (EditText) this.findViewById(R.id.et_path);
        bt_showpic=(Button) this.findViewById(R.id.bt_showpic);
        iv_pic = (ImageView)this.findViewById(R.id.iv_pic);
        //添加点击事件
        bt_showpic.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.bt_showpic:
            //获取输入文本
            String path = et_path.getText().toString();
            try {
                //得到bitmap
                Bitmap bitmap = ImageUtil.getBitmap(path);
                //显示bitmap到界面
                iv_pic.setImageBitmap(bitmap);
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            break;
        }
    }
}

运行结果：