Android 从网络加载图片

public class ViewPhotoActivity extends Activity implements OnClickListener {    protected static final int SUCCESS = 0;    protected static final int FAILURE = 1;    protected static final int ERROR = 2;    private Button btn_view;    private EditText editText;    private ImageView imageView;    private Handler mHandler = new Handler(){        public void handleMessage(Message msg) {            switch (msg.what) {            case SUCCESS:                Bitmap bitmap = (Bitmap) msg.obj;                imageView.setImageBitmap(bitmap);                break;            case FAILURE:                Toast.makeText(ViewPhotoActivity.this, "加载失败", 1).show();                break;            case ERROR:                Toast.makeText(ViewPhotoActivity.this, "网络异常", 1).show();                break;            default:                break;            }        };    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_viewphone);        btn_view = (Button) findViewById(R.id.btn_view);        editText = (EditText) findViewById(R.id.et_url);        imageView = (ImageView) findViewById(R.id.imageview);        btn_view.setOnClickListener(this);    }    @Override    public void onClick(View v) {        if (v == btn_view) {            getImage();        }    }    private void getImage() {        new Thread(new Runnable() {            @Override            public void run() {                try {                    URL url = new URL(editText.getText().toString());                    HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("GET");                    conn.setConnectTimeout(5000);                    if (conn.getResponseCode()==200) {                        InputStream stream = conn.getInputStream();                        Bitmap bitmap = BitmapFactory.decodeStream(stream);                        //imageView.setImageBitmap(bitmap);                        Message message = Message.obtain();                        message.obj = bitmap;                        message.what = SUCCESS;                        mHandler.sendMessage(message);                    }else {                        mHandler.sendEmptyMessage(FAILURE);                    }                } catch (Exception e) {                    e.printStackTrace();                    mHandler.sendEmptyMessage(ERROR);                }             }        }).start();    }}
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