Android 9.0 双屏异显Demo

package com.telpo.presentation; import android.annotation.SuppressLint; import android.app.Activity; import android.app.AlertDialog; import android.app.Presentation; import android.content.Context; import android.content.DialogInterface; import android.content.res.Resources; import android.hardware.display.DisplayManager; import android.os.Build; import android.os.Bundle; import android.support.annotation.RequiresApi; import android.util.Log; import android.util.SparseArray; import android.view.Display; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.ListView; import android.widget.Spinner; import android.widget.TextView; //BEGIN_INCLUDE(activity) /** * <h3>Presentation Activity</h3> * * <p> * This demonstrates how to create an activity that shows some content * on a secondary display using a {@link Presentation}. * </p><p> * The activity uses the {@link DisplayManager} API to enumerate displays. * When the user selects a display, the activity opens a {@link Presentation} * on that display. We show a different photograph in each presentation * on a unique background along with a label describing the display. * We also write information about displays and display-related events to * the Android log which you can read using <code>adb logcat</code>. * </p><p> * You can try this out using an HDMI or Wifi display or by using the * "Simulate secondary displays" feature in Development Settings to create a few * simulated secondary displays. Each display will appear in the list along with a * checkbox to show a presentation on that display. * </p><p> * uses the media router to automatically select a secondary display * on which to show content based on the currently selected route. * </p> */ @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1) public class PresentationActivity extends Activity implements OnCheckedChangeListener, OnClickListener, OnItemSelectedListener { private final String TAG = "PresentationActivity"; // Key for storing saved instance state. private static final String PRESENTATION_KEY = "presentation"; // The content that we want to show on the presentation. private static final int[] PHOTOS = new int[] { R.drawable.frantic, R.drawable.photo1, R.drawable.photo2, R.drawable.photo3, R.drawable.photo4, R.drawable.photo5, R.drawable.photo6, R.drawable.sample_4, }; private DisplayManager mDisplayManager; private DisplayListAdapter mDisplayListAdapter; private CheckBox mShowAllDisplaysCheckbox; private ListView mListView; private int mNextImageNumber; // List of presentation contents indexed by displayId. // This state persists so that we can restore the old presentation // contents when the activity is paused or resumed. private SparseArray<DemoPresentationContents> mSavedPresentationContents; // List of all currently visible presentations indexed by display id. private final SparseArray<DemoPresentation> mActivePresentations = new SparseArray<DemoPresentation>(); /** * Initialization of the Activity after it is first created. Must at least * call {@link android.app.Activity#setContentView setContentView()} to * describe what is to be displayed in the screen. */ @Override protected void onCreate(Bundle savedInstanceState) { // Be sure to call the super class. super.onCreate(savedInstanceState); // Restore saved instance state. if (savedInstanceState != null) { mSavedPresentationContents = savedInstanceState.getSparseParcelableArray(PRESENTATION_KEY); } else { mSavedPresentationContents = new SparseArray<DemoPresentationContents>(); } // Get the display manager service. mDisplayManager = (DisplayManager)getSystemService(Context.DISPLAY_SERVICE); // See assets/res/any/layout/presentation_activity.xml for this // view layout definition, which is being set here as // the content of our screen. setContentView(R.layout.presentation_activity); // Set up checkbox to toggle between showing all displays or only presentation displays. mShowAllDisplaysCheckbox = (CheckBox)findViewById(R.id.show_all_displays); mShowAllDisplaysCheckbox.setOnCheckedChangeListener(this); // Set up the list of displays. mDisplayListAdapter = new DisplayListAdapter(this); mListView = (ListView)findViewById(R.id.display_list); mListView.setAdapter(mDisplayListAdapter); } @Override protected void onResume() { // Be sure to call the super class. super.onResume(); // Update our list of displays on resume. mDisplayListAdapter.updateContents(); // Restore presentations from before the activity was paused. final int numDisplays = mDisplayListAdapter.getCount(); for (int i = 0; i < numDisplays; i++) { final Display display = mDisplayListAdapter.getItem(i); final DemoPresentationContents contents = mSavedPresentationContents.get(display.getDisplayId()); if (contents != null) { showPresentation(display, contents); } } mSavedPresentationContents.clear(); // Register to receive events from the display manager. mDisplayManager.registerDisplayListener(mDisplayListener, null); } @Override protected void onPause() { // Be sure to call the super class. super.onPause(); // Unregister from the display manager. mDisplayManager.unregisterDisplayListener(mDisplayListener); // Dismiss all of our presentations but remember their contents. Log.d(TAG, "Activity is being paused. Dismissing all active presentation."); for (int i = 0; i < mActivePresentations.size(); i++) { DemoPresentation presentation = mActivePresentations.valueAt(i); int displayId = mActivePresentations.keyAt(i); mSavedPresentationContents.put(displayId, presentation.mContents); presentation.dismiss(); } mActivePresentations.clear(); } @Override protected void onSaveInstanceState(Bundle outState) { // Be sure to call the super class. super.onSaveInstanceState(outState); outState.putSparseParcelableArray(PRESENTATION_KEY, mSavedPresentationContents); } /** * Shows a {@link Presentation} on the specified display. */ private void showPresentation(Display display, DemoPresentationContents contents) { final int displayId = display.getDisplayId(); if (mActivePresentations.get(displayId) != null) { return; } Log.d(TAG, "Showing presentation photo #" + contents.photo + " on display #" + displayId + "."); DemoPresentation presentation = new DemoPresentation(this, display, contents); presentation.show(); presentation.setOnDismissListener(mOnDismissListener); mActivePresentations.put(displayId, presentation); } /** * Hides a {@link Presentation} on the specified display. */ private void hidePresentation(Display display) { final int displayId = display.getDisplayId(); DemoPresentation presentation = mActivePresentations.get(displayId); if (presentation == null) { return; } Log.d(TAG, "Dismissing presentation on display #" + displayId + ".");