waiting_layout.xml布局的代码：
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="280dip"
android:layout_gravity="center"
android:gravity="center"
android:layout_height="120dip"
android:background="@drawable/alpha_black_back">
<ProgressBar
android:layout_width="wrap_content"
style="?android:attr/progressBarStyleLarge"
android:layout_height="wrap_content"
android:layout_margin="5dip"
/>
<TextView
android:id="@+id/identify_label"
android:textColor="#fff"
android:paddingLeft="3dip"
android:paddingRight="5dip"
android:layout_width="wrap_content"
android:textSize="22sp"
android:layout_height="fill_parent"
android:gravity="center"
android:text="@string/common_message_pleaseWait"
/>
</LinearLayout>
在Activity上层新建一个Window，用于承载loading。这样做的好处，避免在Activity上加一个ProgressView。具体代码如下：
protected final void showWaiting(boolean isBlur) {
isWaiting = true;
try {
WindowManager.LayoutParams lp = null;
if (isBlur) {
lp = new WindowManager.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION, WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_BLUR_BEHIND | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, PixelFormat.TRANSLUCENT);
}
else {
lp = new WindowManager.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, WindowManager.LayoutParams.TYPE_APPLICATION, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, PixelFormat.TRANSLUCENT);
}
WindowManager mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
if (waitView == null) {
LayoutInflater inflate = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
waitView = inflate.inflate(R.layout.waiting_layout, null);
}
mWindowManager.addView(waitView, lp);
}
catch (Throwable e) {
isWaiting = false;
Log.e(TAG, "[showWaiting]");
}
}
protected final void hideWaiting() {
isWaiting = false;
try {
if (waitView != null) {
WindowManager mWindowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
mWindowManager.removeView(waitView);
waitView = null;
}
}
catch (Throwable e) {
Log.e(TAG, "[showWaiting]", e);
}
}
