1.ScrollView中嵌套ScrollView而且内部ScrollView也可滑动
(1)ScrollView继承类
public class InnerScrollView extends ScrollView {
Handler handler;
public ScrollView parentScrollView;
public InnerScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
handler = new Handler();
}
private int lastScrollDelta = 0;
public void resume() {
overScrollBy(0, -lastScrollDelta, 0, getScrollY(), 0, getScrollRange(), 0, 0, true);
lastScrollDelta = 0;
}
int mTop = 10;
/**
* 将targetView滚到最顶端
*/
public void scrollTo(final View targetView) {
handler.postDelayed(new Runnable() {
@Override
public void run() {
int oldScrollY = getScrollY();
int top = targetView.getTop() - mTop;
final int delatY = top - oldScrollY;
lastScrollDelta = delatY;
smoothScrollTo(0, top);
}
}, 50);
}
private int getScrollRange() {
int scrollRange = 0;
if (getChildCount() > 0) {
View child = getChildAt(0);
scrollRange = Math.max(0, child.getHeight() - (getHeight()));
}
return scrollRange;
}
int currentY;
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
if (parentScrollView == null) {
return super.onInterceptTouchEvent(ev);
} else {
if (ev.getAction() == MotionEvent.ACTION_DOWN) {
// 将父scrollview的滚动事件拦截
currentY = (int)ev.getY();
setParentScrollAble(false);
return super.onInterceptTouchEvent(ev);
} else if (ev.getAction() == MotionEvent.ACTION_UP) {
// 把滚动事件恢复给父Scrollview
setParentScrollAble(true);
} else if (ev.getAction() == MotionEvent.ACTION_MOVE) {
}
}
return super.onInterceptTouchEvent(ev);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
View child = getChildAt(0);
if (parentScrollView != null) {
if (ev.getAction() == MotionEvent.ACTION_MOVE) {
int height = child.getMeasuredHeight();
height = height - getMeasuredHeight();
// System.out.println("height=" + height);
int scrollY = getScrollY();
// System.out.println("scrollY" + scrollY);
int y = (int)ev.getY();
// 手指向下滑动
if (currentY < y) {
if (scrollY <= 0) {
// 假设向下滑动到头。就把滚动交给父Scrollview
setParentScrollAble(true);
return false;
} else {
setParentScrollAble(false);
}
} else if (currentY > y) {
if (scrollY >= height) {
// 假设向上滑动到头，就把滚动交给父Scrollview
setParentScrollAble(true);
return false;
} else {
setParentScrollAble(false);
}
}
currentY = y;
}
}
return super.onTouchEvent(ev);
}
/**
* 是否把滚动事件交给父scrollview
*
* @param flag
*/
private void setParentScrollAble(boolean flag) {
parentScrollView.requestDisallowInterceptTouchEvent(!flag);
}
}(2)ScrollView使用Activity
public class ScrollViewActivity extends Activity {
ScrollView scrollView1;
InnerScrollView innerScrollView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
scrollView1 = (ScrollView)findViewById(R.id.scroll_1);
innerScrollView = (InnerScrollView)findViewById(R.id.scroll_2);
innerScrollView.parentScrollView = scrollView1;
final Button button = (Button)innerScrollView.findViewById(R.id.scroll_button2);
final View content = findViewById(R.id.scroll_content);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (content.getVisibility() == View.VISIBLE) {
innerScrollView.resume();
content.setVisibility(View.GONE);
} else {
innerScrollView.scrollTo(v);
content.setVisibility(View.VISIBLE);
}
}
});
}
}2.ScrollView中嵌套ListView而且内部ListView也可滑动
(1)ScrollView继承类
public class InnerListView extends ListView {
ScrollView parentScrollView;
public ScrollView getParentScrollView() {
return parentScrollView;
}
public void setParentScrollView(ScrollView parentScrollView) {
this.parentScrollView = parentScrollView;
}
private int maxHeight;
public int getMaxHeight() {
return maxHeight;
}
public void setMaxHeight(int maxHeight) {
this.maxHeight = maxHeight;
}
public InnerListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
if (maxHeight > -1) {
heightMeasureSpec = MeasureSpec.makeMeasureSpec(maxHeight, MeasureSpec.AT_MOST);
}
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
System.out.println(getChildAt(0));
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
switch (ev.getAction()) {
case MotionEvent.ACTION_DOWN:
setParentScrollAble(false);
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
setParentScrollAble(true);
break;
default:
break;
}
return super.onInterceptTouchEvent(ev);
}
/**
* @param flag
*/
private void setParentScrollAble(boolean flag) {
parentScrollView.requestDisallowInterceptTouchEvent(!flag);
}
}(2)ScrollView有用Activity
public class ListViewActivity extends Activity {
ScrollView scrollView;
InnerListView listView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.list_view_test);
listView = (InnerListView)findViewById(R.id.list);
scrollView = (ScrollView)findViewById(R.id.scroll_view);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.select_dialog_singlechoice);
for (int i = 0; i < 100; i++) {
adapter.add(String.valueOf(i));
}
listView.setAdapter(adapter);
listView.setCacheColorHint(0x00000000);
listView.setBackgroundDrawable(null);
listView.setBackgroundColor(Color.WHITE);
listView.setParentScrollView(scrollView);
listView.setMaxHeight(400);
}
}