Android在SDK 17時,提供了多屏異步顯示。本篇將敘述如何在兩個屏幕中透過HDMI來達成異步顯示的方式。
Step 1: 檢視屏幕數量
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| DisplayManager mDisplayManager = context.getSystemService(Context.DISPLAY_SERVICE);
Display[] displays = mDisplayManager.getDisplays(); Log.i(TAG, "Display Counts: " + displays.length);
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Step 2: 創建Presentation類別
首先我們要先創建class並繼承Presentation。
(Presentation類繼承Dialog類別)
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| public class SubDislay extends Presentation { public SubDislay(Context outerContext, Display display) { super(outerContext, display); }
public SubDislay(Context outerContext, Display display, int theme) { super(outerContext, display, theme); }
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState);
setContentView(R.layout.sub_view);
Resources r = getContext().getResources(); ImageView image = findViewById(R.id.imageView3); image.setImageDrawable(r.getDrawable(R.drawable.pic2)); } }
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Step 3: 呈現畫面於副屏幕
在MainActivity.java中宣告SubDislay,並將畫面給予副屏幕呈現。
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| SubDislay mPresentation =new SubDislay (this,displays[1]); if(null != mPresentation) { mPresentation.show(); }
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