android学习日记03--常用控件progressbar/seekbar

浏览数：129 / 时间：2015年06月11日

5、progressbar
进度条，比较常用的组件，一般有圆形和条形两种；
默认进度条是圆形的
小圆型进度条：
style="?android:attr/progressBarStyleSmall"

大圆形进度条：
style="?android:attr/progressBarStyleLarge"

条形进度条：
style="?android:attr/progressBarStyleHorizontal"

android:max="100" --最大值
android:progress="50" --初始值
android:secondaryProgress="60" --次进度条值

例子：

新开个线程，让条形进度条从最小增到最大，再减到最小

 1 public class MainActivity extends Activity implements Runnable{
 2 
 3     private Thread td;
 4     private ProgressBar pb;
 5     private boolean stateChange;
 6     
 7     @Override
 8     protected void onCreate(Bundle savedInstanceState) {
 9         super.onCreate(savedInstanceState);
10         setContentView(R.layout.activity_main);
11         
12         pb = (ProgressBar)findViewById(R.id.pd);
13         td = new Thread(this);
14         
15         td.start();
16     }
17 
18 
19     @Override
20     public boolean onCreateOptionsMenu(Menu menu) {
21         // Inflate the menu; this adds items to the action bar if it is present.
22         getMenuInflater().inflate(R.menu.main, menu);
23         return true;
24     }
25 
26 
27     @Override
28     public void run() {
29         // TODO Auto-generated method stub
30         while(true) {
31             int current = pb.getProgress();
32             int max = pb.getMax();
33             int securrent = pb.getSecondaryProgress();
34             
35             if (stateChange == false) {
36                 if(current >= max) {
37                     stateChange = true;
38                 }else {
39                     pb.setProgress(current+1);
40                     pb.setSecondaryProgress(current+1);
41                 }
42             }else {
43                 if(current <= 0) {
44                     stateChange = false;
45                 }else {
46                     pb.setProgress(current-1);
47                     pb.setSecondaryProgress(current-1);
48                 }
49             }
50             
51             try {
52                 td.sleep(50);
53             } catch (Exception e) {
54                 e.printStackTrace();
55             }
56         }
57     }
58     
59 }

View Code

6、seekBar
拖动条

监听事件：

 1 @Override
 2 public void onStopTrackingTouch(SeekBar seekBar) {
 3 // TODO Auto-generated method stub
 4 tv.setText("拖动完成...");
 5 }
 6 
 7 @Override
 8 public void onStartTrackingTouch(SeekBar seekBar) {
 9 // TODO Auto-generated method stub
10 tv.setText("拖动中...");
11 }
12 
13 @Override
14 public void onProgressChanged(SeekBar seekBar, int progress,
15 boolean fromUser) {
16 // TODO Auto-generated method stub
17 tv.setText("当前拖动条值为:"+progress);
18 }