仿android系统Launcher界面

写的我要吐血了。。。是不是我太菜了？

放出代码.....

res-->layout-->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"     >   <!-- 定义一个ViewSwitcher组件 -->   <ViewSwitcher        android:id="@+id/viewSwitcher"       android:layout_width="fill_parent"       android:layout_height="fill_parent"/>      <!-- 定义滚动到上一屏的按钮 -->   <Button        android:id="@+id/button_prev"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:layout_alignParentLeft="true"       android:onClick="prev"       android:text="<"/>      <!--定义滚动到下一屏的按钮  -->   <Button        android:id="@+id/button_next"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_alignParentBottom="true"       android:layout_alignParentRight="true"       android:onClick="next"       android:text=">"/></RelativeLayout>

res-->layout-->labelicon.xml

<?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"    android:gravity="center" >    <ImageView         android:id="@+id/imageview"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>    <TextView         android:id="@+id/textview"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:gravity="center"/></LinearLayout>

res-->layout-->slidelistview.xml

<?xml version="1.0" encoding="utf-8"?><GridView  xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:numColumns="4"  android:layout_height="match_parent">    </GridView>

res-->anim-->slide_in_right.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">    <!-- 设置从右边拖进来的动画    android:duration指定动画持续时间  --><translateandroid:fromXDelta="100%p"android:toXDelta="0"android:duration="@android:integer/config_mediumAnimTime" /></set>

res-->anim-->slide_out_left.xml

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android">    <!-- 设置从左边拖出去的动画     android:duration指定动画持续时间 --><translateandroid:fromXDelta="0"android:toXDelta="-100%p"android:duration="@android:integer/config_mediumAnimTime" /></set>

MainActivity.java

package com.demo.viewswitcherdemo;import java.util.ArrayList;import android.os.Bundle;import android.app.Activity;import android.graphics.drawable.Drawable;import android.view.LayoutInflater;import android.view.Menu;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.TextView;import android.widget.ViewSwitcher;import android.widget.ViewSwitcher.ViewFactory;public class MainActivity extends Activity {//定义一个常量，用于显示每屏显示的应用程序数public static final int NUMBER_PER_SCREEN = 12;//代表应用程序的内部类public static class DataItem{//应用程序名称public String dataName;//应用程序图标public Drawable drawable;}//保存系统所有应用程序的List集合private ArrayList<DataItem> items = new ArrayList<DataItem>();//记录当前正在显示第几屏的程序private int screenNo = -1;//保存程序所占的总屏数private int screenCount;ViewSwitcher switcher;//创建LayoutInflater对象LayoutInflater inflater;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);inflater = LayoutInflater.from(MainActivity.this);//创建一个包含40个元素的List集合，用于模拟包含40个应用程序for(int i=0; i<40; i++){String label = "" + i;Drawable drawable = getResources().getDrawable(R.drawable.ic_launcher);DataItem item = new DataItem();item.dataName = label;item.drawable = drawable;items.add(item);}//计算应用程序所占的总屏数//如果应用程序的数量能整除Number_per_screen,除法的结果就是总屏数//如果不能，总屏数应该是除法的结果再加1screenCount = items.size() % NUMBER_PER_SCREEN == 0 ? items.size() / NUMBER_PER_SCREEN: items.size() / NUMBER_PER_SCREEN + 1;switcher = (ViewSwitcher)findViewById(R.id.viewSwitcher);switcher.setFactory(new ViewFactory(){//实际上就是返回一个GridView组件@Overridepublic View makeView() {//加载这个组件，实际上就是一个GridView组件return inflater.inflate(R.layout.slidelistview, null);}});//页面加载时先显示第一屏next(null);}public void next(View v){if(screenNo < screenCount - 1){screenNo++;//为ViewSwitcher的组件显示过程设置动画switcher.setInAnimation(this,R.anim.slide_in_right);//为ViewSwitcher的组件隐藏过程设置动画switcher.setOutAnimation(this,R.anim.slide_out_left);//控制下一屏将要显示的GridView对应的Adapter((GridView)switcher.getNextView()).setAdapter(adapter);switcher.showNext();}}public void prev(View v){if(screenNo > 0){screenNo--;//为ViewSwitcher的组件显示过程设置动画switcher.setInAnimation(this,R.anim.slide_out_left);//为ViewSwitcher的组件隐藏过程设置动画switcher.setOutAnimation(this,R.anim.slide_in_right);//控制下一屏将要显示的GridView对应的Adapter((GridView)switcher.getNextView()).setAdapter(adapter);switcher.showPrevious();}}//该BaseAdapter负责为每屏显示的GridView提供列表项private BaseAdapter adapter = new BaseAdapter(){@Overridepublic int getCount() {// 如果已经到了最后一屏幕，且应用程序的数量不能整除Number_per_screenif(screenNo == screenCount -1 && items.size() % NUMBER_PER_SCREEN != 0){//最后一屏显示的程序数为应用程序的数量对number_per_screen求余return items.size() % NUMBER_PER_SCREEN;}//否则每屏显示的程序数量为Number_per_screenreturn NUMBER_PER_SCREEN;}@Overridepublic DataItem getItem(int position) {// 根据screenNo计算第position个列表项的数据return items.get(screenNo * NUMBER_PER_SCREEN + position);}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = convertView;if(convertView == null){//加载R.layout.labelicon布局文件view = inflater.inflate(R.layout.labelicon, null);}//获取R.layout.labelicon布局文件中的ImageView组件，并为之设置图标ImageView imageView = (ImageView)view.findViewById(R.id.imageview);imageView.setImageDrawable(getItem(position).drawable);//获取TextviewTextView textView = (TextView)view.findViewById(R.id.textview);textView.setText(getItem(position).dataName);return view;}};@Overridepublic 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;}}