先留着有时间再看

获取Launcher 启动列表

即 列出所有Launcher程序 通过PackageManager 来获取

[代码 步骤]

1. 定义内部类 LauncherItem 用于定义Application相关属性 比如：图标 名称 以及 ComponentName

Java代码

1 　public class LauncherItem {

2

3 　　Drawable icon;

4

5 　　String name;

6

7 　　ComponentName component;

8

9 　　LauncherItem(Drawable d, String s,ComponentName cn){

10

11 　　icon = d;

12

13 　　name = s;

14

15 　　component = cn;

16

17 　　}

18

19 　　};

20

21 　　public class LauncherItem {

22

23 　　Drawable icon;

24

25 　　String name;

26

27 　　ComponentName component;

28

29 　　LauncherItem(Drawable d, String s,ComponentName cn){

30

31 　　icon = d;

32

33 　　name = s;

34

35 　　component = cn;

36

37 　　}

38

39 　　};

40

2. 定义List lvalue 用于存放查询结果

Java代码

public void addLauncher(){

lvalue = new ArrayList();

pkgMgt = this.getPackageManager();

//to query all launcher & load into List<>

Intent it = new Intent(Intent.ACTION_MAIN);

it.addCategory(Intent.CATEGORY_LAUNCHER);

List ra =pkgMgt.queryIntentActivities(it,0);

for(int i=0;i< p>

ActivityInfo ai = ra.get(i).activityInfo;

//String ainfo = ai.toString();

Drawable icon = ai.loadIcon(pkgMgt);

String label = ai.loadLabel(pkgMgt).toString();

ComponentName c = new ComponentName(ai.applicationInfo.packageName,ai.name);

LauncherItem item = new LauncherItem(icon,label,c);

lvalue.add(item);

}

}

public void addLauncher(){

lvalue = new ArrayList();

pkgMgt = this.getPackageManager();

//to query all launcher & load into List<>

Intent it = new Intent(Intent.ACTION_MAIN);

it.addCategory(Intent.CATEGORY_LAUNCHER);

List ra =pkgMgt.queryIntentActivities(it,0);

for(int i=0;i< p>

ActivityInfo ai = ra.get(i).activityInfo;

//String ainfo = ai.toString();

Drawable icon = ai.loadIcon(pkgMgt);

String label = ai.loadLabel(pkgMgt).toString();

ComponentName c = new ComponentName(ai.applicationInfo.packageName,ai.name);

LauncherItem item = new LauncherItem(icon,label,c);

lvalue.add(item);

}

}

3. 定义LauncherAdapter 并指定各个item显示样式

Java代码

public class LauncherAdapter extends BaseAdapter {

Activity activity;

public LauncherAdapter(Activity a){

activity = a;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return lvalue.size();

}

@Override

public Object getItem(int arg0) {

// TODO Auto-generated method stub

return arg0;

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

return composeItem(position);

}

public View composeItem(int position){

LinearLayout layout = new LinearLayout(activity);

layout.setOrientation(LinearLayout.HORIZONTAL);

ImageView iv = new ImageView(activity);

iv.setImageDrawable(lvalue.get(position).icon);

layout.addView(iv);

TextView tv = new TextView(activity);

tv.setText(lvalue.get(position).name);

tv.setPadding(10, 5, 0, 0);

layout.addView(tv);

return layout;

}

}

public class LauncherAdapter extends BaseAdapter {

Activity activity;

public LauncherAdapter(Activity a){

activity = a;

}

@Override

public int getCount() {

// TODO Auto-generated method stub

return lvalue.size();

}

@Override

public Object getItem(int arg0) {

// TODO Auto-generated method stub

return arg0;

}

@Override

public long getItemId(int position) {

// TODO Auto-generated method stub

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

// TODO Auto-generated method stub

return composeItem(position);

}

public View composeItem(int position){

LinearLayout layout = new LinearLayout(activity);

layout.setOrientation(LinearLayout.HORIZONTAL);

ImageView iv = new ImageView(activity);

iv.setImageDrawable(lvalue.get(position).icon);

layout.addView(iv);

TextView tv = new TextView(activity);

tv.setText(lvalue.get(position).name);

tv.setPadding(10, 5, 0, 0);

layout.addView(tv);

return layout;

}

}

4. 启动某个item 当单击时

Java代码

adapter = new LauncherAdapter(this);

lv.setAdapter(adapter);

lv.setOnItemClickListener(new OnItemClickListener(){

@Override

public void onItemClick(AdapterView arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

Intent intent =new Intent(Intent.ACTION_VIEW);

intent.setComponent(lvalue.get(arg2).component);

startActivity(intent);

}

});

adapter = new LauncherAdapter(this);

lv.setAdapter(adapter);

lv.setOnItemClickListener(new OnItemClickListener(){

@Override

public void onItemClick(AdapterView arg0, View arg1, int arg2,

long arg3) {

// TODO Auto-generated method stub

Intent intent =new Intent(Intent.ACTION_VIEW);

intent.setComponent(lvalue.get(arg2).component);

startActivity(intent);

}

});

5. emulator 结果结果

- 列出所有application

- 单击Alarm Clock 的情形：