安卓学习-activity-LauncherActivity

LauncherActivity

可以启动别的程序的窗口，当然了，自己直接写个普通的activity也可以实现

 

item.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingTop="20dp"
    android:paddingBottom="20dp"
     >

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:paddingRight="20dp"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/imageView1"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:text="Small Text"
        android:textAppearance="?android:attr/textAppearanceSmall" />

</RelativeLayout>

MainActivity.java

继承LauncherActivity，需要设置ListAdapter,并实现Intent intentForPosition(int position)

public class MainActivity extends LauncherActivity {

    List<String> classes = new ArrayList<String>();

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // 获取应用程序
        List<PackageInfo> pags = getPackageManager().getInstalledPackages(0);

        List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();

        for (int i = 0; i < pags.size(); i++) {
            PackageInfo pag = pags.get(i);
            // 用户程序
            //if ((pag.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) == 0) {
                Map<String, Object> map = new HashMap<String, Object>();
                // 程序名字
                map.put("name",pag.applicationInfo.loadLabel(getPackageManager()).toString());
                // 图标
                map.put("drawable",pag.applicationInfo.loadIcon(getPackageManager()));
                map.put("packageName", pag.packageName);

                classes.add(pag.packageName);

                data.add(map);

            //}
        }

        SimpleAdapter sa = new SimpleAdapter(MainActivity.this, data,
                R.layout.item,
                new String[] { "name", "drawable", "packageName" }, new int[] {
                        R.id.textView1, R.id.imageView1, R.id.textView2 });
        setListAdapter(sa);
        // 将drawablei显示到imageview里
        sa.setViewBinder(new ViewBinder() {
            public boolean setViewValue(View view, Object data,
                    String textRepresentation) {
                if (view instanceof ImageView && data instanceof Drawable) {
                    ImageView iv = (ImageView) view;
                    iv.setImageDrawable((Drawable) data);
                    return true;
                } else
                    return false;
            }
        });

    }

    protected Intent intentForPosition(int position) {
            Intent intent = this.getPackageManager().getLaunchIntentForPackage(
                    classes.get(position));
            return intent;
    }

}

由于LancherActivity已经内置了list，因此直接实现getTargetIntent就可以了

MainActivity

public class MainActivity extends LauncherActivity {

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

     protected Intent getTargetIntent() {
            // TODO Auto-generated method stub
            Intent intent=new Intent(Intent.ACTION_MAIN);
            intent.addCategory("android.intent.category.LAUNCHER");

            return intent;
    }

}