使用动画，Handler， ListView 优化， ListView滚动监听

<ImageView
android:id="@+id/iv_img"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@mipmap/ic_launcher"
android:layout_centerInParent="true"
/>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="手机列表"
android:textSize="25dp" />

<ListView
android:id="@+id/listview_lv"
android:layout_width="match_parent"
android:layout_height="match_parent"></ListView>
</LinearLayout>

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_paren
e122
t"
>

<ImageView
android:id="@+id/i_img"
android:layout_width="80dp"
android:layout_height="80dp"
android:src="@mipmap/ic_launcher" />

<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">

<TextView
android:id="@+id/t_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="小米"
android:textSize="15dp" />

<TextView
android:id="@+id/t_price"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="1600"
android:textSize="15dp" />

</LinearLayout>
</LinearLayout>

bean类

package com.example.sanzhouui;

/**
* Created by asus on 2017/9/1.
*/

public class Goods {
public String name,price;

public Goods(String name, String price) {
this.name = name;
this.price = price;
}

public void setName(String name) {
this.name = name;
}

public void setPrice(String price) {
this.price = price;
}

public String getName() {
return name;
}

public String getPrice() {
return price;
}

@Override
public String toString() {
return "Goods{" +
"name='" + name + '\'' +
", price='" + price + '\'' +
'}';
}
}

package com.example.sanzhouui;

import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationSet;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {

private ImageView img;

int counrt = 0;
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
counrt++;
if (counrt==2){
Intent intent = new Intent(MainActivity.this,ErActivity.class);
startActivity(intent);
}
sendEmptyMessageDelayed(0,1000);
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

img = (ImageView) findViewById(R.id.iv_img);
getscale();
handler.sendEmptyMessageDelayed(0,1000);

}

public void getscale() {
ScaleAnimation animation = new ScaleAnimation(2f, 0f, 2f, 0f,
Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF, 0.5f);
animation.setDuration(2000);
animation.setRepeatCount(Animation.INFINITE);
TranslateAnimation animation2 = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF, 1f, Animation.RELATIVE_TO_SELF, 0f, Animation.RELATIVE_TO_SELF, 0f);
animation2.setDuration(2000);
animation2.setRepeatCount(Animation.INFINITE);

AnimationSet set = new AnimationSet(false);
set.addAnimation(animation);
set.addAnimation(animation2);
img.startAnimation(set);

}
}

package com.example.sanzhouui;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;

/**
* Created by asus on 2017/9/1.
*/

public class ErActivity extends AppCompatActivity {

private ArrayList<Goods> list;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.er_activity);

final ListView lv = (ListView) findViewById(R.id.listview_lv);
initData();

lv.setAdapter(new MyAdapter());
//编写listview的滚动监听器，并设置给ListView 编写滚动监听器的业务逻辑，实现ListView滚动到最后一行，加载更多数据
lv.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView absListView, int i) {

}

@Override
public void onScroll(AbsListView absListView, int i, int i1, int i2) {
if (i + i1 == i2 && i2 > 0) {
TextView tv = new TextView(ErActivity.this);
tv.setText("Holle");
lv.addFooterView(tv);
}
}
});
}
//添加数据
private void initData() {
list = new ArrayList<>();
for (int i = 0; i < 10; i++) {
Goods bean = new Goods("小米" + i, "1500" + i);
list.add(bean);
if (i >= 5) {
Goods bean2 = new Goods("华为" + i, "2000" + i);
list.add(bean2);
}

}
}

class MyAdapter extends BaseAdapter {
@Override
public int getCount() {
return list.size();
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

@Override
public View getView(int i, View convertView, ViewGroup viewGroup) {

ViewHoler holder;
if (convertView == null) {
holder = new ViewHoler();
convertView = View.inflate(ErActivity.this, R.layout.item, null);
holder.iv = (ImageView) convertView.findViewById(R.id.i_img);
holder.name = (TextView) convertView.findViewById(R.id.t_name);
holder.price = (TextView) convertView.findViewById(R.id.t_price);
convertView.setTag(holder);
} else {
holder = (ViewHoler) convertView.getTag();
}
holder.iv.setImageResource(R.mipmap.ic_launcher);
holder.name.setText(list.get(i).getName());
holder.price.setText(list.get(i).getPrice());
return convertView;
}

class ViewHoler {
TextView name, price;
ImageView iv;
}
}
}