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分屏#xff1a;是指一个屏幕分出多个窗口#xff0c;分别显示不同应用的界面#xff0c;这在当前的手机设备中很常见。多屏#xff1a;是指一个设备存在多个屏幕#xff0c;这些可能是虚拟屏幕或者实体硬件屏幕#xff0c;不同的应用同时显示在不同的屏幕中#…前言
分屏是指一个屏幕分出多个窗口分别显示不同应用的界面这在当前的手机设备中很常见。多屏是指一个设备存在多个屏幕这些可能是虚拟屏幕或者实体硬件屏幕不同的应用同时显示在不同的屏幕中或者相同应用的不同页面同时现在在不同的屏幕中。
在我们日常生活中所接触的大部分以Android系统为载体的智能化硬件设备大多都只有一个屏幕但是有的时候会出现需要多个屏幕的场景特别是随着新能源汽车行业竞争的白热化越来越多的车厂倾向于通过多屏幕来获得消费者的青睐比如为汽车主驾副驾所对应的主屏副屏等等这就导致车机系统的多屏幕场景越来越多而在智能手机端多屏协助的场景也越来越多比如将手机屏幕内容实时投放到大屏电视上已得到更好的视觉体验
一、模拟辅助设备
1.1、模拟辅助设备功能开关
1、在Android开发者选项里面有一个模拟辅助设备功能开关。 2、此功能默认为无当我们点击并选择一个分辨率的时候屏幕上会多出来一个小窗口。 这个小窗口其实就是系统新创建的一个虚拟屏幕只不过Android系统将该虚拟屏幕的视图实时绘制在了此窗口上。
1.2、屏幕设备信息
1、我们通过adb执行dumpsys display指令可以看到系统中当前存在的屏幕设备的相关信息。 Logical Displays: size1Display 0:mDisplayId0mPhase1mLayerStack0mHasContenttruemDesiredDisplayModeSpecs{baseModeId1 allowGroupSwitchingfalse primaryRefreshRateRange[0 60] appRequestRefreshRateRange[0 60]}mRequestedColorMode0mDisplayOffset(0, 0)mDisplayScalingDisabledfalsemPrimaryDisplayDevice内置屏幕mBaseDisplayInfoDisplayInfo{内置屏幕, displayId 0, displayGroupId 0, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, FLAG_TRUSTED, real 1080 x 2400, largest app 1080 x 2400, smallest app 1080 x 2400, appVsyncOff 1000000, presDeadline 16666666, mode 1, defaultMode 1, modes [{id1, width1080, height2400, fps60.000004, alternativeRefreshRates[90.0, 120.00001]}, {id2, width1080, height2400, fps120.00001, alternativeRefreshRates[60.000004, 90.0]}, {id3, width1080, height2400, fps90.0, alternativeRefreshRates[60.000004, 120.00001]}], hdrCapabilities HdrCapabilities{mSupportedHdrTypes[1, 2, 3, 4], mMaxLuminance420.0, mMaxAverageLuminance210.1615, mMinLuminance0.323}, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type INTERNAL, uniqueId local:4630946545580055170, app 1080 x 2400, density 440 (419.449 x 419.257) dpi, layerStack 0, colorMode 0, supportedColorModes [0, 7, 9], address {port130, model0x40446d58ef1f1a}, deviceProductInfo DeviceProductInfo{name, manufacturerPnpIdQCM, productId1, modelYearnull, manufactureDateManufactureDate{week27, year2006}, connectionToSinkType0}, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 1.0, brightnessDefault 0.07496032, installOrientation ROTATION_0}mOverrideDisplayInfoDisplayInfo{内置屏幕, displayId 0, displayGroupId 0, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, FLAG_TRUSTED, real 1080 x 2400, largest app 2313 x 2269, smallest app 1080 x 949, appVsyncOff 1000000, presDeadline 16666666, mode 1, defaultMode 1, modes [{id1, width1080, height2400, fps60.000004, alternativeRefreshRates[90.0, 120.00001]}, {id2, width1080, height2400, fps120.00001, alternativeRefreshRates[60.000004, 90.0]}, {id3, width1080, height2400, fps90.0, alternativeRefreshRates[60.000004, 120.00001]}], hdrCapabilities HdrCapabilities{mSupportedHdrTypes[1, 2, 3, 4], mMaxLuminance420.0, mMaxAverageLuminance210.1615, mMinLuminance0.323}, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type INTERNAL, uniqueId local:4630946545580055170, app 1080 x 2269, density 440 (419.449 x 419.257) dpi, layerStack 0, colorMode 0, supportedColorModes [0, 7, 9], address {port130, model0x40446d58ef1f1a}, deviceProductInfo DeviceProductInfo{name, manufacturerPnpIdQCM, productId1, modelYearnull, manufactureDateManufactureDate{week27, year2006}, connectionToSinkType0}, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 1.0, brightnessDefault 0.07496032, installOrientation ROTATION_0}mRequestedMinimalPostProcessingfalsemFrameRateOverrides[]mPendingFrameRateOverrideUids{}2、默认情况下系统只有一个屏幕设备信息而在我们开启模拟辅助显示设备功能开关之后Android系统中便会多出来一个屏幕设备信息。 Logical Displays: size2Display 0:mDisplayId0mPhase1mLayerStack0mHasContenttruemDesiredDisplayModeSpecs{baseModeId1 allowGroupSwitchingfalse primaryRefreshRateRange[0 60] appRequestRefreshRateRange[0 60]} mRequestedColorMode0mDisplayOffset(0, 0)mDisplayScalingDisabledfalsemPrimaryDisplayDevice内置屏幕mBaseDisplayInfoDisplayInfo{内置屏幕, displayId 0, displayGroupId 0, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, FLAG_TRUSTED, real 1080 x 2400, largest app 1080 x 2400, smallest app 1080 x 2400, appVsyncOff 1000000, presDeadline 16666666, mode 1, defaultMode 1, modes [{id1, width1080, height2400, fps60.000004, alternativeRefreshRates[90.0, 120.00001]}, {id2, width1080, height2400, fps120.00001, alternativeRefreshRates[60.000004, 90.0]}, {id3, width1080, height2400, fps90.0, alternativeRefreshRates[60.000004, 120.00001]}], hdrCapabilities HdrCapabilities{mSupportedHdrTypes[1, 2, 3, 4], mMaxLuminance420.0, mMaxAverageLuminance210.1615, mMinLuminance0.323}, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type INTERNAL, uniqueId local:4630946545580055170, app 1080 x 2400, density 440 (419.449 x 419.257) dpi, layerStack 0, colorMode 0, supportedColorModes [0, 7, 9], address {port130, model0x40446d58ef1f1a}, deviceProductInfo DeviceProductInfo{name, manufacturerPnpIdQCM, productId1, modelYearnull, manufactureDateManufactureDate{week27, year2006}, connectionToSinkType0}, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 1.0, brightnessDefault 0.07496032, installOrientation ROTATION_0}mOverrideDisplayInfoDisplayInfo{内置屏幕, displayId 0, displayGroupId 0, FLAG_SECURE, FLAG_SUPPORTS_PROTECTED_BUFFERS, FLAG_TRUSTED, real 1080 x 2400, largest app 2313 x 2269, smallest app 1080 x 949, appVsyncOff 1000000, presDeadline 16666666, mode 1, defaultMode 1, modes [{id1, width1080, height2400, fps60.000004, alternativeRefreshRates[90.0, 120.00001]}, {id2, width1080, height2400, fps120.00001, alternativeRefreshRates[60.000004, 90.0]}, {id3, width1080, height2400, fps90.0, alternativeRefreshRates[60.000004, 120.00001]}], hdrCapabilities HdrCapabilities{mSupportedHdrTypes[1, 2, 3, 4], mMaxLuminance420.0, mMaxAverageLuminance210.1615, mMinLuminance0.323}, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type INTERNAL, uniqueId local:4630946545580055170, app 1080 x 2269, density 440 (419.449 x 419.257) dpi, layerStack 0, colorMode 0, supportedColorModes [0, 7, 9], address {port130, model0x40446d58ef1f1a}, deviceProductInfo DeviceProductInfo{name, manufacturerPnpIdQCM, productId1, modelYearnull, manufactureDateManufactureDate{week27, year2006}, connectionToSinkType0}, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 1.0, brightnessDefault 0.07496032, installOrientation ROTATION_0}mRequestedMinimalPostProcessingfalsemFrameRateOverrides[]mPendingFrameRateOverrideUids{}Display 2:mDisplayId2mPhase1mLayerStack2mHasContentfalsemDesiredDisplayModeSpecs{baseModeId4 allowGroupSwitchingfalse primaryRefreshRateRange[0 60] appRequestRefreshRateRange[0 60]} mRequestedColorMode0mDisplayOffset(0, 0)mDisplayScalingDisabledfalsemPrimaryDisplayDevice叠加视图 #1mBaseDisplayInfoDisplayInfo{叠加视图 #1, displayId 2, displayGroupId 0, FLAG_PRESENTATION, FLAG_TRUSTED, real 1280 x 720, largest app 1280 x 720, smallest app 1280 x 720, appVsyncOff 0, presDeadline 33333332, mode 4, defaultMode 4, modes [{id4, width1280, height720, fps60.000004, alternativeRefreshRates[]}], hdrCapabilities null, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type OVERLAY, uniqueId overlay:1, app 1280 x 720, density 213 (213.0 x 213.0) dpi, layerStack 2, colorMode 0, supportedColorModes [0], deviceProductInfo null, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 0.0, brightnessDefault 0.0, installOrientation ROTATION_0}mOverrideDisplayInfoDisplayInfo{叠加视图 #1, displayId 2, displayGroupId 0, FLAG_PRESENTATION, FLAG_TRUSTED, real 1280 x 720, largest app 1280 x 1280, smallest app 720 x 720, appVsyncOff 0, presDeadline 33333332, mode 4, defaultMode 4, modes [{id4, width1280, height720, fps60.000004, alternativeRefreshRates[]}], hdrCapabilities null, userDisabledHdrTypes [], minimalPostProcessingSupported false, rotation 0, state ON, type OVERLAY, uniqueId overlay:1, app 1280 x 720, density 213 (213.0 x 213.0) dpi, layerStack 2, colorMode 0, supportedColorModes [0], deviceProductInfo null, removeMode 0, refreshRateOverride 0.0, brightnessMinimum 0.0, brightnessMaximum 0.0, brightnessDefault 0.0, installOrientation ROTATION_0}mRequestedMinimalPostProcessingfalsemFrameRateOverrides[]mPendingFrameRateOverrideUids{}可以发现此事屏幕变成了两个。
二、将页面显示到特定屏幕中
2.1 获取当前屏幕设备信息
1、在Android系统默认情况下我们新建一个Activity并将其启动。 DisplayInfoActivity.java public class DisplayInfoActivity extends AppCompatActivity {Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main_activity);TextView tvDisplayInfo findViewById(R.id.tv_display_info);Display display getDisplay();tvDisplayInfo.setText(display.toString());}
}main_activity.xml LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:orientationverticalTextViewandroid:idid/tv_display_infoandroid:layout_widthmatch_parentandroid:layout_height200dpandroid:gravitycenterandroid:text屏幕设备信息android:textColor#F00android:textSize30sp //LinearLayout2、默认显示效果如下所示。 通过Activity显示的信息我们可以发现该页面当前显示的屏幕设备id为0名字叫做内置屏幕。
2.2 将页面显示到其他屏幕上
1、当我们为Android系统开启了模拟辅助显示设备的功能之后此时我们通过代码打开一个新的Activity并为其指定displayid为2这样这个新的Activity就会显示到这个新的虚拟屏幕中。 DisplayInfoActivity.java public class DisplayInfoActivity extends AppCompatActivity {Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main_activity);TextView tvDisplayInfo findViewById(R.id.tv_display_info);Display display getDisplay();tvDisplayInfo.setText(display.toString());findViewById(R.id.btn_open_activity).setOnClickListener(new View.OnClickListener() {Overridepublic void onClick(View view) {Intent intent new Intent(DisplayInfoActivity.this, DisplayInfoActivity.class);ActivityOptions activityOptions ActivityOptions.makeBasic();activityOptions.setLaunchDisplayId(2);//指定要显示到displayid为2的屏幕设备上startActivity(intent, activityOptions.toBundle());}});}}main_activity.xml LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:orientationverticalTextViewandroid:idid/tv_display_infoandroid:layout_widthmatch_parentandroid:layout_height200dpandroid:gravitycenterandroid:text屏幕设备信息android:textColor#F00android:textSize30sp /Buttonandroid:idid/btn_open_activityandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:text在模拟辅助设备中显示新页面 /
/LinearLayout2、当我们点击按钮的时候当前页面会从主屏幕消失并显示到模拟辅助功能所开启的窗口里面。 通过Activity显示的信息我们可以发现该页面当前显示的屏幕设备id为2名字叫做叠加视图也就是新增的虚拟屏幕设备ID。
