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This article mainly explains "how to achieve the different display function of the device by Android". The content of the explanation in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to achieve the different display function of the device by Android".

I. what is heteroscope?

When the screen is cast wirelessly or wirelessly, the screen of the Android device will be projected intact on the monitor, which is called the screen.

On the other hand, the different display is that the pictures of the Android device and the monitor are displayed separately, such as chatting on the Android device and playing movies on the monitor, which is a bit like multi-window.

Of course, Android devices need to support VGA/HDMI display. Which devices are supported? I found that only some of the devices are supported on the storefront of a store.

In addition, some Android devices support both screen casting and office mode, while some Android settings only support screen casting.

Second, implement step 2.1 permissions

Static permission

Before implementing the screen casting function, you should allow the permission to operate the screen casting function, which is actually the permission to display the system window in the configuration file.

Dynamic permission

If (Build.VERSION.SDK_INT > = 23) {if (! Settings.canDrawOverlays (MainActivity.this)) {Intent intent = new Intent (Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse ("package:" + getPackageName (); startActivityForResult (intent, 10) } @ Override protected void onActivityResult (int requestCode, int resultCode, Intent data) {if (requestCode = = 10) {if (Build.VERSION.SDK_INT > = 23) {if (! Settings.canDrawOverlays (this)) {/ / SYSTEM_ALERT_WINDOW permission not granted... Toast.makeText (MainActivity.this, "not granted", Toast.LENGTH_SHORT);} super.onActivityResult (requestCode, resultCode, data);}

Why do you need these permissions? because the main class of the secondary screen, Presentation, inherits from Dialog

2.2 define the screen split interface public class DifferentDisplay extends Presentation {public DifferentDisplay (Context outerContext, Display display) {super (outerContext, display);} @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.diffrentdisplay);} public void setText (String text) {TextView textView = findViewById (R.id.tv_test); textView.setText (text);}}

Interface layout

2.3 Operation split screen interface

Put the code before you explain it.

Public class MainActivity extends AppCompatActivity {final String TAG = "MainActivity"; DifferentDisplay mPresentation; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.activity_main); / / A dual screen display DisplayManager mDisplayManager; / / screen management class Display [] displays;// screen array mDisplayManager = (DisplayManager) MainActivity.this.getSystemService (Context.DISPLAY_SERVICE) Displays = mDisplayManager.getDisplays (); / / get the display array if (displays.length = = 0) {Log.d (TAG, "No display"); return;} mPresentation = new DifferentDisplay (getApplicationContext (), displays [1]) / / displays [1] is a secondary screen / / 8.0 needs to be replaced with TYPE_APPLICATION_OVERLAY mPresentation.getWindow () .setType (WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); mPresentation.show ();} int index = 1; public void Test (View view) {if (mPresentation! = null) mPresentation.setText (+ + index + "Click");}}

Display [] displays is the number of screens obtained, including the Android device's own screen. For example, new DifferentDisplay (getApplicationContext (), displays [1]) operates the first secondary screen.

There's another question of permissions.

MPresentation.getWindow () setType (WindowManager.LayoutParams.TYPE_SYSTEM_ALERT)

Appeal codes above 6.0 are OK (unverified), but above 8.0 need to be used in this way

Need to replace: WindowManager.LayoutParams.TYPE_SYSTEM_ALERT with: WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY

Thank you for your reading, the above is the content of "how to achieve the different display function of the device in Android". After the study of this article, I believe you have a deeper understanding of how to achieve the different display function of the equipment in Android, and the specific use needs to be verified in practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!

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