Android攻城狮 Android中更新UI的几种方式

Android中更新UI的几种方式：
1. Activity 的 runOnUiThread()
2. Handler 的 post()
3. Handler 的 sendMessage()
4. View 的 post()

 

 

public class FiveActivity extends Activity {

    private TextView textView;

    private Handler handler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            textView.setText("ok2");
        };
    };

    private void handle1() {

        handler.post(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                textView.setText("ok1");
            }
        });

    }

    // 最常见的的
    public void handle2() {
        handler.sendEmptyMessage(1);
    }

    public void updateUI() {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                textView.setText("ok3");
            }
        });
    }

    public void viewUI() {
        textView.post(new Runnable() {

            @Override
            public void run() {
                // TODO Auto-generated method stub
                textView.setText("ok4");
            }
        });
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.five);
        textView = (TextView) findViewById(R.id.textView1);
        new Thread() {
            public void run() {
                try {
                    Thread.sleep(2000);
                    // handle1()
                    // handle2();
                    // updateUI();
                    viewUI();
                } catch (InterruptedException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }.start();
    }
}