自定义控件SmartImageView

1、自定义SmartImageView 继承ImageView：

public class SmartImageView extends ImageView
{
	public Context mContext;
	protected static final int	SUCCESS	= 1;

	public SmartImageView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public SmartImageView(Context context, AttributeSet attrs) {
		super(context, attrs);
		mContext = context;
	}
	
	Handler handler = new Handler(){
		public void handleMessage(Message msg) {
			switch (msg.what)
			{
				case SUCCESS:
					Bitmap bitmap =(Bitmap)msg.obj;
					setImageBitmap(bitmap);
					break;
				default:
					//获取图片失败
					Toast.makeText(mContext, "图片获取失败", 0).show();
					break;
			}
		};
	};

	public SmartImageView(Context context) {
		super(context);
	}
	
	public void setImageUri(final String path)
	{
		new Thread(){
			public void run() {
				try
				{
					URL url = new URL(path);
					HttpURLConnection conn = (HttpURLConnection) url.openConnection();
					conn.setConnectTimeout(5000);
					conn.setReadTimeout(5000);
					conn.setRequestMethod("GET");
					int code = conn.getResponseCode();
					if (code == 200)
					{
						InputStream is = conn.getInputStream();
						Bitmap bitmap = BitmapFactory.decodeStream(is);
						Message msg = Message.obtain();
						msg.obj = bitmap;
						msg.what =SUCCESS;
						handler.sendMessage(msg);
					}
				}
				catch (Exception e)
				{
					e.printStackTrace();
					handler.sendEmptyMessage(0);
				}
			};
		}.start();
	}
}

 2、布局：

<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"
    tools:context=".MainActivity" >

    <com.tang.smartimageview.SmartImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:src="@drawable/ic_launcher" />

</RelativeLayout>

 3、MainActivity使用SmartImageView:

public class MainActivity extends Activity
{
	@Override
	protected void onCreate(Bundle savedInstanceState)
	{
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		SmartImageView iv = (SmartImageView) findViewById(R.id.imageView1);
		iv.setImageUri("http://a.hiphotos.baidu.com/image/w%3D310/sign=3cb1bd0e369b033b2c88fadb25cf3620/3801213fb80e7becbc7ca3eb2d2eb9389b506b12.jpg");
	}
}