New UI-use the keepScreenOn attribute of view to keep the screen always on, ui-keepscreenon

New UI-use the keepScreenOn attribute of view to keep the screen always on, ui-keepscreenon

New UI-set visible and invisible View

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1) This section introduces:

In fact, I have already said this in my internship notes, and I have introduced three methods to keep the screen always bright,

In this example, partial view. keepScreenOn is used to demonstrate simple usage!

2) usage:

It is very simple to use the keepScreenOn attribute.

Step 1: Set android: keepScreenOn = "true" to a UI component in the layout file corresponding to the Activity that needs to be normally highlighted"

Then, as long as the Activity is not stopped, the screen will always be on!

Step 2: how to disable the always-on mode? It's easy ~ Modify the attributes of the UI component and set it to false when you need to disable the usual brightness.

Paste the following simple code:

Activity_main.xml:

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: id = "@ + id/LinearLayout1" android: layout_width = "match_parent" android: layout_height = "match_parent" android: orientation = "vertical" tools: context = ". mainActivity "> <Button android: id =" @ + id/btnclose "android: layout_width =" wrap_content "android: layout_height =" wrap_content "android: text = "close always bright"/> <TextView android: id = "@ + id/txtliang" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: keepScreenOn = "true" android: text = "I am so bright"/> </LinearLayout>

MainActvitiy. java

Package com. jay. example. keepscreenondemo; import android. OS. bundle; import android. app. activity; import android. view. view; import android. view. view. onClickListener; import android. view. windowManager; import android. widget. button; import android. widget. textView; public class MainActivity extends Activity {private Button btnclose; private TextView txtliang; private int flag =-1; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); btnclose = (Button) findViewById (R. id. btnclose); txtliang = (TextView) findViewById(R.id.txt liang); btnclose. setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View v) {if (flag =-1) {txtliang. setKeepScreenOn (false); txtliang. setText ("I cannot light up =-="); btnclose. setText ("bright");} else {txtliang. setKeepScreenOn (true); txtliang. setText ("I highlighted again ^-^"); btnclose. setText ("not bright ");}}});}}

Ps: As for the running effect, you don't need to post it. Set the phone backlight time to the minimum, the author's time is 15 s, and then run the demo.

Let the Activity of the component with this attribute be located at the beginning of the screen, and put it aside. After 15 s of no operation,

Check whether the phone screen is dimmed!