：Android Market的 Loading效果

在Android中,要实现Loading效果，一般情况下都使用ProgressDialog控件。ApiDemos/src/com/example/android/apis/view/ProgressBar3.java 提供两个demo: Progressbar show Indeterminate

仔细看了Android Market，发现却是不一样的，请看截图: ：Android Market的 Loading效果

那到底如何实现呢？首先，我们创建一个布局文件, res/layout/fullscreen_loading_indicator.xml, 其内容如下:

<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< LinearLayout
xmlns:android = " http://schemas.android.com/apk/res/android "
android:gravity = " center_vertical|center_horizontal "
android:orientation = " horizontal "
android:id = " @+id/fullscreen_loading_style "

android:layout_width = " fill_parent "
android:layout_height = " fill_parent "
>
< ProgressBar
android:layout_gravity = " center_vertical "
android:layout_width = " wrap_content "
android:layout_height = " wrap_content "
style = " ?android:attr/progressBarStyleSmall "
/>

< TextView
android:id = " @+id/current_action "
android:layout_width = " wrap_content "
android:layout_height = " wrap_content "
android:layout_marginLeft = " 5.0dip "
android:text = " @+string/loading "
/>
</ LinearLayout >

然后在main.xml 把它include 进来

<? xmlversion = " 1.0 " encoding = " utf-8 " ?>
< LinearLayoutxmlns:android = " http://schemas.android.com/apk/res/android "
android:orientation = " vertical " android:layout_width = " fill_parent "
android:layout_height = " fill_parent " >
< LinearLayoutandroid:orientation = " vertical "
android:id = " @+id/main_info "
android:visibility = " gone "
android:layout_width = " fill_parent "
android:layout_height = " fill_parent " >
< TextViewandroid:layout_width = " fill_parent "
android:layout_height = " fill_parent "
android:text = " abc " ></ TextView >
</ LinearLayout >
< LinearLayoutandroid:orientation = " vertical "
android:id = " @+id/main_Loading "

android:layout_width = " fill_parent "
android:layout_height = " fill_parent " >
< includeandroid:visibility = " visible "
android:layout_width = " fill_parent "
android:layout_height = " fill_parent "
layout = " @layout/fullscreen_loading_style " />
</ LinearLayout >
</ LinearLayout >

主程序：

package com.tymx.fullloading;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.widget.LinearLayout;

public class myFullLoading extends Activity{
/** Calledwhentheactivityisfirstcreated. */
private LinearLayoutmLoadingLayout;

@Override
public void onCreate(BundlesavedInstanceState){
super .onCreate(savedInstanceState);
setContentView(R.layout.main);

final Handlerhandler = new Handler(){

@Override
public void handleMessage(Messagemsg){
// TODOAuto-generatedmethodstub
super .handleMessage(msg);
if (msg.what == 1 ){
mLoadingLayout = (LinearLayout)findViewById(R.id.fullscreen_loading_style);
mLoadingLayout.setVisibility(View.GONE);

LinearLayoutmMain = (LinearLayout)findViewById(R.id.main_info);
mMain.setVisibility(View.VISIBLE);
}

}

};
new Thread(){
public void run(){
for ( int i = 0 ;i < 1000 ;i ++ ){
System.out.print(i + "" );
}
Messagemsg = handler.obtainMessage( 1 , " flash " );
handler.sendMessage(msg);
}
}.start();

}
}

运行的效果为:

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