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Android API文档： FragmentActivity is a special activity provided in the Support Library to handle fragments on system versions older than API level 11. If the lowest system version you support is API l

private void getAppVersionInfo(){     try {         PackageInfo pinfo = this.getPackageManager().getPackageInfo(                 this.getPackageName(), PackageManager.GET_CONFIGURATIONS);        

private void getDisplayMetrics(){     WindowManager wm = (WindowManager) getApplicationContext().getSystemService(Context.WINDOW_SERVICE);     final int rotation = wm.getDefaultDisplay().getRotation

初始化 timerHandler = new Handler(); serverRefresh = new ServerRefresh(); 1,启动定时器 private void setRefresh() {     if (timerHandler != null && serverRefresh != null) {         timerHandler .postDe

首先先定义一个广播action 广播actiong String flag = “android.intent.action.MyBorad” 1，接收广播 private void startReceiver() {     broadcastManager = LocalBroadcastManager.getInstance(getActivity());     intentF

首先自定义一个布局文件 http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" android:orientation="vertical"

http://schemas.android.com/apk/res/android">                                         android:topLeftRadius="10dp"                   android:topRightRadius="10dp"                 />

btn_style.xml http://schemas.android.com/apk/res/android">             btn_pressed.xml http://schemas.android.com/apk/res/android">                                           

一、PopupWindow：  Android 7.0之前，在指定位置弹出popupwindow可以用showAsDropDown(View anchor, int xoff, int yoff)，showAtLocation(View parent, int gravity, int x, int y)。但在android 7.0上，用showAsDropDown（）在popupwindo