Loading waiting 实现方式

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);

}

}