Android Utility Code Seven paragraph (v)

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1. Expand and close the status bar

public static final void Collapsestatusbar (Context ctx) {
Object Sbservice = Ctx.getsystemservice ("StatusBar");
try {
class<?> Statusbarmanager = Class.forName ("Android.app.StatusBarManager");
Method collapse;
if (Build.VERSION.SDK_INT >= build.version_codes. JELLY_BEAN_MR1) {
Collapse = Statusbarmanager.getmethod ("Collapsepanels");
} else {
Collapse = Statusbarmanager.getmethod ("collapse");
}
Collapse.invoke (Sbservice);
} catch (Exception e) {
E.printstacktrace ();
}
}

public static final void Expandstatusbar (Context ctx) {
Object Sbservice = Ctx.getsystemservice ("StatusBar");
try {
class<?> Statusbarmanager = Class.forName ("Android.app.StatusBarManager");
Method expand;
if (Build.VERSION.SDK_INT >= 17) {
expand = Statusbarmanager.getmethod ("Expandnotificationspanel");
} else {
expand = Statusbarmanager.getmethod ("expand");
}
Expand.invoke (Sbservice);
} catch (Exception e) {
E.printstacktrace ();
}
}

Purpose: Can be used to close the status bar after clicking Notifacation

2. Get Status bar height

public static int Getstatusbarheight (context context) {
Class<?> c = null;
Object obj = null;
Field field = NULL;
int x = 0, statusbarheight = 0;
try {
c = Class.forName ("Com.android.internal.r$dimen");
obj = C.newinstance ();
field = C.getfield ("Status_bar_height");
x = Integer.parseint (Field.get (obj). toString ());
Statusbarheight = Context.getresources (). getdimensionpixelsize (x);
} catch (Exception E1) {
E1.printstacktrace ();
}
return statusbarheight;
}

3, the ListView uses the Viewholder extremely shorthand method

public static <t extends view> T getadapterview (View convertview, int id) {
Sparsearray<view> Viewholder = (sparsearray<view>) convertview.gettag ();
if (Viewholder = = null) {
Viewholder = new sparsearray<view> ();
Convertview.settag (Viewholder);
}
View Childview = viewholder.get (ID);
if (Childview = = null) {
Childview = Convertview.findviewbyid (ID);
Viewholder.put (ID, Childview);
}
Return (T) Childview;
}

Usage:

@Override
Public View GetView (int position, View Convertview, ViewGroup parent) {
if (Convertview = = null) {
Convertview = Layoutinflater.from (Getactivity ()). Inflate (R.layout.fragment_feed_item, parent, false);
}

ImageView Thumnailview = Getadapterview (Convertview, R.id.video_thumbnail);
ImageView Avatarview = Getadapterview (Convertview, R.id.user_avatar);
ImageView Appiconview = Getadapterview (Convertview, R.id.app_icon);

use very concise, will viewholder invisible.

4. Set Activity transparency

<style name= "transparentactivity" parent= "Appbasetheme" >
<item name= "Android:windowbackground" > @android:color/transparent</item>
<item name= "Android:colorbackgroundcachehint" > @null </item>
<item name= "Android:windowistranslucent" >true</item>
<item name= "Android:windownotitle" >true</item>
<item name= "Android:windowcontentoverlay" > @null </item>
</style>

Description: Appbasetheme General is your application designated Android:theme is what here is what, otherwise activity internal space style may be inconsistent.

Use: Used to simulate dialog effects, such as the service can not be used dialog, it is possible to use activity to simulate

5. Code switch fullscreen

//Switch to full screen
GetWindow (). Clearflags (WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
Getactivity (). GetWindow (). Addflags (WindowManager.LayoutParams.FLAG_FULLSCREEN);

Switch to non-fullscreen
GetWindow (). Clearflags (WindowManager.LayoutParams.FLAG_FULLSCREEN);
GetWindow (). Addflags (WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);

Note: When you switch to full screen, the virtual keys at the bottom are still displayed. The secondary method can be called multiple times for switching

Purpose: The player interface is often used

6. Call the developer option to display the Touch location feature

android.provider.Settings.System.putInt (Getcontentresolver (), "Show_touches", 1);

Set 1 to display, setting 0 is not displayed.

7. Get a list of installed and bootable apps on your device

Intent Intent = new Intent (intent.action_main);
Intent.addcategory (Intent.category_launcher);

List<resolveinfo> activities = Getpackagemanager (). Queryintentactivities (Intent, 0)

Note: Using Getinstalledapplications will return many system apps that cannot be started or even have no icons. ResolveInfo.activityInfo.applicationInfo can also fetch the data you want.

Android Utility Code Seven paragraph (v)