android桌面

注：源自传智播客视频教程

现整理此案例，以供日后自己或大家学习、参考：

自定义组合控件demo

实现效果：

下载链接：

http://download.csdn.net/detail/wang725/8738627

主要代码：

1.MainActivity.java

package com.example.desctop;import java.util.ArrayList;import java.util.List;import android.content.Intent;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.graphics.Color;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.GridView;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends ActionBarActivity {private List<String> packageNames;private GridView gv;private PackageManager pm;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                gv = (GridView) findViewById(R.id.gv);                pm = getPackageManager();        Intent intent = new Intent();        intent.setAction("android.intent.action.MAIN");        intent.addCategory("android.intent.category.LAUNCHER");        // 查询出来手机上所有具有启动能力的activity        List<ResolveInfo> infos = pm.queryIntentActivities(intent, PackageManager.GET_INTENT_FILTERS);        packageNames = new ArrayList<String>();        for(ResolveInfo info : infos) {        String packageName = info.activityInfo.packageName;        packageNames.add(packageName);        }        gv.setAdapter(new MyAdapter());                gv.setOnItemClickListener(new OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {// pm.queryIntentActivities(intent, flags) Intent intent = pm.getLaunchIntentForPackage(packageNames.get(position)); if(intent != null) { startActivity(intent); } else { Toast.makeText(MainActivity.this, "soryy，该应用不能启动。", 0).show(); }}});            }        private class MyAdapter extends BaseAdapter {@Overridepublic int getCount() {return packageNames.size();}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {View view = View.inflate(getApplicationContext(), R.layout.item, null);ImageView iv = (ImageView) view.findViewById(R.id.iv);TextView tv = (TextView) view.findViewById(R.id.tv);String packageName = packageNames.get(position).toString();try {iv.setImageDrawable(pm.getPackageInfo(packageName, 0).applicationInfo.loadIcon(pm));tv.setText(pm.getPackageInfo(packageName, 0).applicationInfo.loadLabel(pm));} catch (Exception e) {e.printStackTrace();}return view;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn 0;}    }    /**     * 屏蔽返回键     */    @Override    public void onBackPressed() {    }    }

2.布局

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" >    <GridView        android:numColumns="4"        android:overScrollMode="never"        android:id="@+id/gv"        android:layout_width="fill_parent"        android:layout_height="wrap_content" /></RelativeLayout>

item.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" >        <ImageView         android:id="@+id/iv"        android:layout_width="50dip"        android:layout_height="wrap_content"/>        <TextView         android:id="@+id/tv"        android:singleLine="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:textColor="#000000"/></LinearLayout>