项目结构：
1.LazyScrollView类（自定义ScrollView）
package android.zhh.com.myapplicationscrollview; /**
* Created by sky on 2017/3/19.
*/ import android.content.Context;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ScrollView; /**
* Created by sky on 2017/3/17.
*/
public class LazyScrollView extends ScrollView {
private static final long DELAY = 100; private int currentScroll; private Runnable scrollCheckTask; /**
* @param context
*/
public LazyScrollView(Context context) {
super(context);
init();
} /**
* @param context
* @param attrs
*/
public LazyScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
} /**
* @param context
* @param attrs
* @param defStyle
*/
public LazyScrollView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
} private void init() {
scrollCheckTask = new Runnable() {
@Override
public void run() {
int newScroll = getScrollY();
if (currentScroll == newScroll) {
if (onScrollListener != null) {
onScrollListener.onScrollStopped();
}
} else {
if (onScrollListener != null) {
onScrollListener.onScrolling();
}
currentScroll = getScrollY();
postDelayed(scrollCheckTask, DELAY);
}
}
};
setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
currentScroll = getScrollY();
postDelayed(scrollCheckTask, DELAY);
}
return false;
}
});
} public interface OnScrollListener {
public void onScrollChanged(int x, int y, int oldX, int oldY); public void onScrollStopped(); public void onScrolling();
} private OnScrollListener onScrollListener; /**
* @param onScrollListener
*/
public void setOnScrollListener(OnScrollListener onScrollListener) {
this.onScrollListener = onScrollListener;
} @Override
protected void onScrollChanged(int x, int y, int oldX, int oldY) {
super.onScrollChanged(x, y, oldX, oldY);
if (onScrollListener != null) {
onScrollListener.onScrollChanged(x, y, oldX, oldY);
}
} /**
* @param child
* @return
*/
public boolean isChildVisible(View child) {
if (child == null) {
return false;
}
Rect scrollBounds = new Rect();
getHitRect(scrollBounds);
return child.getLocalVisibleRect(scrollBounds);
} /**
* @return
*/
public boolean isAtTop() {
return getScrollY() <= 0;
} /**
* @return
*/
public boolean isAtBottom() {
return getChildAt(getChildCount() - 1).getBottom() + getPaddingBottom() == getHeight() + getScrollY();
}
}
2.activity_main.xml（布局文件中引用）
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.zhh.com.myapplicationscrollview.LazyScrollView
android:id="@+id/myScrollView"
android:layout_width="match_parent"
android:layout_height="match_parent"> <LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<TextView
android:layout_width="match_parent"
android:layout_height="30dp"
android:text="我是zhujiabin"
android:gravity="center"
/> .......
</LinearLayout>
</android.zhh.com.myapplicationscrollview.LazyScrollView> </RelativeLayout> </LinearLayout>
3.MainActivity（调用监听事件）
package android.zhh.com.myapplicationscrollview; import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.TextView;
import android.widget.Toast; public class MainActivity extends Activity {
// 初始化自定义的ScrollView
private LazyScrollView myScrollView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myScrollView = (LazyScrollView)findViewById(R.id.myScrollView);
// 自定义的ScrollView的滑动监听事件
myScrollView.setOnScrollListener(new LazyScrollView.OnScrollListener() {
@Override
public void onScrollChanged(int x, int y, int oldX, int oldY) {
Log.e("@", "x:" + oldX + "->" + x + ", y:" + oldY + "->" + y);
} @Override
public void onScrollStopped() {
if (myScrollView.isAtTop()) {
Toast.makeText(MainActivity.this, "Stopped at top", Toast.LENGTH_SHORT).show();
} else if (myScrollView.isAtBottom()) {
Toast.makeText(MainActivity.this, "Stopped at bottom", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "Stopped", Toast.LENGTH_SHORT).show();
}
} @Override
public void onScrolling() {
Log.e("@", "scrolling...");
}
});
} }