1 // ScrollView嵌套TextView，实现滚动条 滚动效果
 2 //实现监听，对顶部和底部的判断
 3 //控制滚动条滚动的位置，向上滚动或者向下滚动指定距离
 4 public class MainActivity extends Activity implements OnClickListener {
 5     private TextView textView;
 6     private ScrollView scrollView;
 7     private Button up, down;
 8
 9     @Override
10     protected void onCreate(Bundle savedInstanceState) {
11         super.onCreate(savedInstanceState);
12         setContentView(R.layout.main);
13         up = (Button) findViewById(R.id.up);
14         down = (Button) findViewById(R.id.down);
15         up.setOnClickListener(this);
16         down.setOnClickListener(this);
17         textView = (TextView) findViewById(R.id.content);
18         textView.setText(getResources().getString(R.string.content));
19         scrollView = (ScrollView) findViewById(R.id.scrollview1);
20         //实现监听
21         scrollView.setOnTouchListener(new OnTouchListener() {
22
23             @Override
24             public boolean onTouch(View v, MotionEvent event) {
25                 // TODO Auto-generated method stub
26                 switch (event.getAction()) {
27                 case MotionEvent.ACTION_UP: {break;}
28                 case MotionEvent.ACTION_DOWN: {break;}
29                 case MotionEvent.ACTION_MOVE: {
30                     // 1.getScrollY（）滚动条滑动的距离
31                     // 2.getMeasureHeight() 总的长度
32                     // 3.getHeight()一屏的内容高度
33
34                     // 顶部状态
35                     if (scrollView.getScrollY() <= 0) {
36                         Log.i("main", "滑动到顶部");
37                     }
38                     // 底部状态
39                     // textview的总高度《=屏幕高度+滚动条的滚动距离
40                     if (scrollView.getChildAt(0).getMeasuredHeight() <= scrollView
41                             .getHeight() + scrollView.getScrollY()) {
42                         Log.i("main", "滑动到底部咯");
43                         //继续添加数据
44                         textView.append(getResources().getString(
45                                 R.string.content));
46                     }
47                     break;
48                 }
49
50                 }
51                 return false;
52             }
53         });
54
55     }
56   //控制滚动条滚动的位置
57     @Override
58     public void onClick(View v) {
59         // TODO Auto-generated method stub
60         switch (v.getId()) {
61         // scrollView.scrollTo 以滚动视图起始位置计算
62         // scrollView.scrollBy 相对前一次位置滚动对应的距离
63         case R.id.up: {
64             scrollView.scrollTo(0, -30);
65             break;
66         }
67         case R.id.down: {
68             scrollView.scrollBy(0, 30);
69             break;
70         }
71         }
72     }
73
74 }