桌面应用基本创建流程

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><--主界面布局-->    <GridViewandroid:gravity="center_horizontal"android:stretchMode="columnWidth"android:columnWidth="100dp"android:horizontalSpacing="10dp"android:verticalSpacing="10dp"android:layout_width="match_parent"android:id="@+id/apps_list"android:numColumns="3"android:layout_height="match_parent">    </GridView>

</LinearLayout>

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 <--清单文件中的配置-->
<application    android:name="com.way.launcher.SceneLauncherApplication"    android:icon="@drawable/ic_launcher_home"    android:label="@string/application_name"    android:theme="@android:style/Theme.Black.NoTitleBar" >    <activity        android:name="com.way.launcher.SceneLauncherActivity"        android:configChanges="orientation|keyboardHidden"        android:launchMode="singleTask"        android:screenOrientation="nosensor" >        <intent-filter>            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.HOME" />            <category android:name="android.intent.category.DEFAULT" />            <category android:name="android.intent.category.LAUNCHER" />        </intent-filter>    </activity>    <activity        android:name="com.way.launcher.SceneChooserActivity"        android:configChanges="orientation|keyboardHidden"        android:launchMode="singleTask"        android:screenOrientation="nosensor" /></application>

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public class MyHome extends Activity {private List<ResolveInfo> mApps;GridView mGrid;private AdapterView.OnItemClickListener listener = new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {ResolveInfo info = mApps.get(position);//设置点击item监听String pkg = info.activityInfo.packageName;//该应用的包名String cls = info.activityInfo.name; //应用的主activity类ComponentName componet = new ComponentName(pkg, cls);//设置跳转Intent i = new Intent();//发送意图i.setComponent(componet);startActivity(i);//启动被点击的activity}    };

@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);loadApps();setContentView(R.layout.activity_main);mGrid = (GridView) findViewById(R.id.apps_list);mGrid.setAdapter(new AppsAdapter());//由于adapter是内部类，所以直接将数据传入adapter里面了mGrid.setOnItemClickListener(listener);}private void loadApps() {//查询所有安装的应用Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);mApps = getPackageManager().queryIntentActivities(mainIntent, 0);}

public class AppsAdapter extends BaseAdapter {public AppsAdapter() {}public View getView(int position, View convertView, ViewGroup parent) {ImageView imageView;if (convertView == null) {                imageView = new ImageView(MyHome.this);imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);imageView.setLayoutParams(new GridView.LayoutParams(100, 100));} else {                imageView = (ImageView) convertView;}ResolveInfo info = mApps.get(position);imageView.setImageDrawable(info.activityInfo.loadIcon(getPackageManager()));return imageView;}public final int getCount() {return mApps.size();}

public final Object getItem(int position) {return mApps.get(position);}

public final long getItemId(int position) {return position;}}

@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {return false;}//屏蔽返回键return super.onKeyDown(keyCode, event);}}