我的应用程序中需要具有类似于Facebook Messenger聊天头的功能,基本上是一个可以在其他应用程序上查看的气泡。除了this问题之外,我在此主题上找不到任何在线内容。那么,有什么办法可以用RN做类似的事情?
答案 0 :(得分:1)
此功能不直接由react native支持,并且ios中也不支持,因此只有您可以在android中使用Java本机代码实现。为此,您应该在android中编写一个处理此元素生命周期的服务。 您可以在android项目中找到here的简单实现。这是一个简单明了的示例,您可以将其服务用于您的react native项目,只需更改其xml文件以自定义视图即可。 而且,要启动您的服务,您必须编写一个非常简单的react native模块,像这样
@ReactMethod
public void startService(Promise promise) {
String result = "Success";
Activity activity = getCurrentActivity();
if (activity != null) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(getReactApplicationContext())) {
Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
Uri.parse("package:" + getCurrentActivity().getPackageName()));
getCurrentActivity().startActivityForResult(intent, MainActivity.DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE);
}
}
try {
Intent intent = new Intent(FloatingWidgetService.FLOATING_WIDGET_ID);
intent.setClass(this.getReactApplicationContext(), FloatingWidgetService.class);
getReactApplicationContext().startService(intent);
FloatingWidgetService.setUri(uri);
} catch (Exception e) {
promise.reject(e);
return;
}
promise.resolve(result);
}
在Android-8Oreo中,您必须要求canDrawOverlays,然后才能像这样在MainActivity中等待结果:
private static final int DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE = 1222;
....
private void startFloatingWidgetService() {
if (!mStarted) {
Intent intent = new Intent(this, FloatingWidgetService.class);
ContextCompat.startForegroundService(this, intent);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
this.startForegroundService(intent);
}else{
startService(intent);
}
mStarted = true;
finish();
}
}
....
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == DRAW_OVER_OTHER_APP_PERMISSION_REQUEST_CODE) {
//Check if the permission is granted or not.
if (resultCode == RESULT_OK)
//If permission granted start floating widget service
startFloatingWidgetService();
else
//Permission is not available then display toast
Toast.makeText(this,
getResources().getString(R.string.draw_other_app_permission_denied),
Toast.LENGTH_SHORT).show();
} else {
super.onActivityResult(requestCode, resultCode, data);
}
}
然后,以相同的appstate从该服务再次返回到您的应用(不创建新活动),首先将您的活动启动模式定义为清单中的singleInstance:
<activity
...
android:launchMode="singleInstance"
...
>
并在您的服务中使用这种intent(!):
ReactApplicationContext reactContext = VideoViewModule.getReactContext();
Intent activityIntent = createSingleInstanceIntent();
reactContext.startActivity(activityIntent);
private Intent createSingleInstanceIntent() {
ReactApplicationContext reactContext = VideoViewModule.getReactContext();
String packageName = reactContext.getPackageName();
Intent launchIntent = reactContext.getPackageManager().getLaunchIntentForPackage(packageName);
String className = launchIntent.getComponent().getClassName();
Intent activityIntent = null;
try {
Class<?> activityClass = Class.forName(className);
activityIntent = new Intent(reactContext, activityClass);
activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
} catch (Exception e) {
stopCurrentService();
Log.e("POIFOIWEGBF", "Class not found", e);
}
return activityIntent;
}
希望对您有帮助。