仿微信聊天置顶，删除效果

实现类似微信聊天中的消息的置顶删除效果

Java代码:

package com.example.fangweixin;import java.util.ArrayList;import android.app.AlertDialog;import android.app.ListActivity;import android.content.DialogInterface;import android.os.Bundle;import android.view.ContextMenu;import android.view.Menu;import android.view.MenuItem;import android.view.View;import android.view.ContextMenu.ContextMenuInfo;import android.widget.AdapterView.AdapterContextMenuInfo;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;public class MainActivity extends ListActivity {private ArrayList<String> data=null;private ArrayAdapter adapter;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);       // setContentView(R.layout.activity_main);        data=new ArrayList<String>();        for(int i=0;i<50;i++){        data.add("测试数据"+i);        }        adapter=new ArrayAdapter(this,android.R.layout.simple_expandable_list_item_1, data);        setListAdapter(adapter);        ListView lv= getListView();        lv.setOnCreateContextMenuListener(this);    }    @Override    public void onCreateContextMenu(ContextMenu menu, View v,    ContextMenuInfo menuInfo) {    // TODO Auto-generated method stub    menu.add(1, 1001, 0, "未读");    menu.add(1, 1002, 1, "置顶");    menu.add(1, 1003, 2, "删除");    super.onCreateContextMenu(menu, v, menuInfo);    }        @Override    public boolean onContextItemSelected(MenuItem item) {    // TODO Auto-generated method stub    AdapterContextMenuInfo info=(AdapterContextMenuInfo) item.getMenuInfo();    final int pos=info.position;    int id=item.getItemId();    switch (id) {case 1001:Toast.makeText(this,"未读消息", Toast.LENGTH_SHORT).show();break;case 1002:AlertDialog dialog=new AlertDialog.Builder(this).create();dialog.setTitle("对话框");dialog.setMessage("是否置顶");dialog.setButton(AlertDialog.BUTTON_POSITIVE, "确认", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString s=data.remove(pos);data.add(0, s);adapter.notifyDataSetChanged();Toast.makeText(getApplicationContext(), "置顶成功", Toast.LENGTH_SHORT).show();}});dialog.setButton(AlertDialog.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "取消置顶", Toast.LENGTH_SHORT).show();}});dialog.show();break;case 1003:AlertDialog dialog1=new AlertDialog.Builder(this).create();dialog1.setTitle("对话框");dialog1.setMessage("是否删除");dialog1.setButton(AlertDialog.BUTTON_POSITIVE, "确认", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubString s=data.remove(pos);adapter.notifyDataSetChanged();Toast.makeText(getApplicationContext(), "删除成功", Toast.LENGTH_SHORT).show();}});dialog1.setButton(AlertDialog.BUTTON_NEGATIVE, "取消", new DialogInterface.OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {// TODO Auto-generated method stubToast.makeText(getApplicationContext(), "取消删除", Toast.LENGTH_SHORT).show();}});dialog1.show();break;default:break;}    return super.onContextItemSelected(item);    }           @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}