Android攻城狮 Android中更新UI的几种方式

Posted 2020-09-13 张兮兮

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()

 

 

 1 public class FiveActivity extends Activity {
 2 
 3     private TextView textView;
 4 
 5     private Handler handler = new Handler() {
 6         public void handleMessage(android.os.Message msg) {
 7             textView.setText("ok2");
 8         };
 9     };
10 
11     private void handle1() {
12 
13         handler.post(new Runnable() {
14 
15             @Override
16             public void run() {
17                 // TODO Auto-generated method stub
18                 textView.setText("ok1");
19             }
20         });
21 
22     }
23 
24     // 最常见的的
25     public void handle2() {
26         handler.sendEmptyMessage(1);
27     }
28 
29     public void updateUI() {
30         runOnUiThread(new Runnable() {
31 
32             @Override
33             public void run() {
34                 // TODO Auto-generated method stub
35                 textView.setText("ok3");
36             }
37         });
38     }
39 
40     public void viewUI() {
41         textView.post(new Runnable() {
42 
43             @Override
44             public void run() {
45                 // TODO Auto-generated method stub
46                 textView.setText("ok4");
47             }
48         });
49     }
50 
51     @Override
52     protected void onCreate(Bundle savedInstanceState) {
53         // TODO Auto-generated method stub
54         super.onCreate(savedInstanceState);
55         setContentView(R.layout.five);
56         textView = (TextView) findViewById(R.id.textView1);
57         new Thread() {
58             public void run() {
59                 try {
60                     Thread.sleep(2000);
61                     // handle1()
62                     // handle2();
63                     // updateUI();
64                     viewUI();
65                 } catch (InterruptedException e) {
66                     // TODO Auto-generated catch block
67                     e.printStackTrace();
68                 }
69             }
70         }.start();
71     }
72 }