模拟手机QQ滑动删除消息
package com.example.srolltest;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.HorizontalScrollView;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
private ListView listView;
private Myadapter adapter;
private List<String> datas;
private int screenWidth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
DisplayMetrics outMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(outMetrics);
screenWidth = outMetrics.widthPixels;
initDatas();
adapter = new Myadapter();
listView.setAdapter(adapter);
}
private void initDatas() {
// TODO Auto-generated method stub
datas = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
datas.add("删除我吧,删除我吧" + i);
}
}
class Myadapter extends BaseAdapter {
@Override
public int getCount() {
// TODO Auto-generated method stub
return datas.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return datas.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
final ViewHolder viewHolder;
if (convertView == null) {
convertView = LayoutInflater.from(MainActivity.this).inflate(
R.layout.item_main, null);
viewHolder = new ViewHolder();
viewHolder.horizontalScrollView = (HorizontalScrollView) convertView.findViewById(R.id.horizontalScrollView);
viewHolder.tvContexTextView = (TextView) convertView.findViewById(R.id.tv_context);
viewHolder.btnDelete = (Button) convertView.findViewById(R.id.btn_delete);
viewHolder.toTop = (Button) convertView.findViewById(R.id.btn_toTop);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
viewHolder.tvContexTextView.setText(datas.get(position));
viewHolder.tvContexTextView.setWidth(screenWidth);
if (viewHolder.horizontalScrollView.getScrollX() > 0) {
viewHolder.horizontalScrollView.smoothScrollTo(0, 0);
}
convertView.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_UP:
int actionWidth = viewHolder.btnDelete.getWidth()+viewHolder.toTop.getWidth();
int scrollX =viewHolder.horizontalScrollView.getScrollX();
if(scrollX>actionWidth/2){
viewHolder.horizontalScrollView.smoothScrollTo(actionWidth, 0);
}else {
viewHolder.horizontalScrollView.smoothScrollTo(0, 0);
}
return true;
}
return false;
}
});
viewHolder.tvContexTextView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
notifyDataSetChanged();
}
});
viewHolder.btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
datas.remove(position);
notifyDataSetChanged();
}
});
viewHolder.toTop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
String temp = datas.get(0);
datas.set(0, datas.get(position));
datas.set(position, temp);
notifyDataSetChanged();
}
});
return convertView;
}
class ViewHolder {
HorizontalScrollView horizontalScrollView;
TextView tvContexTextView;
Button btnDelete;
Button toTop;
}
}
}
activity_main.xml
<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" android:orientation="vertical" > <ListView android:id="@+id/listView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:fastScrollEnabled="true" /> </LinearLayout>
item_main.xml
<?xml version="1.0" encoding="utf-8"?> <HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/horizontalScrollView" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#8492B4" android:scrollbars="none" > <LinearLayout android:layout_width="wrap_content" android:layout_height="match_parent" android:orientation="horizontal" > <TextView android:id="@+id/tv_context" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" /> <Button android:id="@+id/btn_delete" android:layout_width="wrap_content" android:layout_height="match_parent" android:background="#33ff0000" android:text="删除" /> <Button android:id="@+id/btn_toTop" android:layout_width="wrap_content" android:layout_height="match_parent" android:background="#3300ff00" android:text="置顶" /> </LinearLayout> </HorizontalScrollView>