android listview反序和正序显示

本人很喜欢晚上睡觉用暴风语音看电影,如图：

现在写个demo 演示下

MainActivity.java

package com.example.listview;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener, OnItemClickListener {

private Button btn;

private ListView listview;

private List<String> datas;

private MyAdapter adapter;

private boolean isFu;

private List<String> mDatas;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

listview = (ListView) findViewById(R.id.listview);

btn = (Button) findViewById(R.id.btn);

btn.setOnClickListener(this);

initData();

listview.setOnItemClickListener(this);

}

private void initData() {

datas = new ArrayList<String>();

mDatas = new ArrayList<String>();

for(int i=0;i<100;i++){

datas.add("测试"+i);

}

for(int i=datas.size()-1;i>=0;i--){

mDatas.add(datas.get(i));

}

adapter = new MyAdapter();

adapter.setDatas(datas);

listview.setAdapter(adapter);

}

class MyAdapter extends BaseAdapter{

private List<String> datas;

public void setDatas(List<String> datas) {

this.datas = datas;

}

@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(int position, View convertView, ViewGroup parent) {

TextView tv = new TextView(MainActivity.this);

tv.setText(datas.get(position));

tv.setTextSize(20);

return tv;

}

}

@Override

public void onClick(View v) {

if(isFu){

btn.setText("正序");

isFu = false;

adapter.setDatas(datas);

adapter.notifyDataSetChanged();

}else{

btn.setText("反序");

isFu = true;

adapter.setDatas(mDatas);

adapter.notifyDataSetChanged();

}

}

@Override

public void onItemClick(AdapterView<?> parent, View view, int position,

long id) {

String content = (String) adapter.getItem(position);

if(isFu){

Toast.makeText(getApplicationContext(), content, 0).show();

}else{

Toast.makeText(getApplicationContext(), content, 0).show();

}

}

}

activity_main.xml

<RelativeLayout 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"

>

<Button

android:id="@+id/btn"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="正序" />

<ListView

android:id="@+id/listview"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:cacheColorHint="#00000000"

android:layout_below="@id/btn"

android:layout_marginTop="3dp"

></ListView>

</RelativeLayout>