Launcher的简单实现，

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简单应用launcher，把手机界面显示在自己的APP中，

这是清单文件中应该是的样子：

<activity            android:name=".Launcher"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />                <category android:name="android.intent.category.HOME" />                  <category android:name="android.intent.category.DEFAULT" />             </intent-filter>        </activity>

然后呢，为了盛放手机里面的已经下载的APP，所以当前项目的主界面显示用Gridview来展示：

<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"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <GridView         android:id="@+id/grid"        android:layout_width="fill_parent"        android:layout_height="fill_parent"        android:numColumns="4"        ></GridView></RelativeLayout>

然后主界面代码：

package com.example.actionbardemo;import java.util.Collections;import java.util.List;import android.app.ActionBar;import android.app.Activity;import android.content.ComponentName;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.content.pm.ResolveInfo;import android.os.Bundle;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;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.TextView;/** * actionBar使用需Android版本4.0以上， * 及Launcher的简单用法，将桌面放入自己的APP中。 * @author xue * */public class Launcher extends Activity implements OnItemClickListener{private PackageManager mPackageManager;private GridView mGridView; private Context mContext;private List<ResolveInfo> mAllApps; @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ActionBar bar = getActionBar();bar.setDisplayHomeAsUpEnabled(true);//bar.setHomeButtonEnabled(true);setupViews();}public void setupViews() {          mContext = Launcher.this;        mPackageManager = getPackageManager();          mGridView = (GridView) findViewById(R.id.grid);          bindAllApps();         // GridView中放入数据          mGridView.setAdapter(new GridItemAdapter(mContext, mAllApps));          mGridView.setNumColumns(4);          mGridView.setOnItemClickListener(this);      }  public void bindAllApps() {          // 应用中总有一个activity申明成这两个属性,也就是应用的入口          Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);          mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);          // 包含上面两个属性的全部查出来,并且排序          //简单来说就是，查询出手机上所有下载了的APP，是一个集合        mAllApps = mPackageManager.queryIntentActivities(mainIntent, 0);          Collections.sort(mAllApps, new ResolveInfo.DisplayNameComparator(                  mPackageManager));      }      @Override      /**     * 点击条目，跳转到该APP中去     * 跳转实现用的是intent，查询到该条目的包名和主activity名称。     */    public void onItemClick(AdapterView<?> parent, View view, int position,              long id) {          ResolveInfo res = mAllApps.get(position);          // 该应用的包名和主Activity          String pkg = res.activityInfo.packageName;          String cls = res.activityInfo.name;          ComponentName componet = new ComponentName(pkg, cls);          Intent intent = new Intent();          intent.setComponent(componet);          startActivity(intent);      }      private class GridItemAdapter extends BaseAdapter {          private Context context;          private List<ResolveInfo> resInfo;          public GridItemAdapter(Context c, List<ResolveInfo> res) {              context = c;              resInfo = res;          }          @Override          public int getCount() {              return resInfo.size();          }          @Override          public Object getItem(int position) {              return null;          }          @Override          public long getItemId(int position) {              return 0;          }          @Override          public View getView(int position, View convertView, ViewGroup parent) {              convertView = LayoutInflater.from(context).inflate(                      R.layout.application_layout, null);              ImageView imageView = (ImageView) convertView                      .findViewById(R.id.imageview);              TextView textView = (TextView) convertView                      .findViewById(R.id.textview);              ResolveInfo res = resInfo.get(position);              imageView.setImageDrawable(res.loadIcon(mPackageManager));              textView.setText(res.loadLabel(mPackageManager).toString());              return convertView;          }      }@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.menu.add("Hello!");menu.add("World!");getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// TODO Auto-generated method stubreturn super.onOptionsItemSelected(item);}}

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