http://www.cnblogs.com/freeliver54/archive/2012/04/13/2446503.html
主要实现效果:
--------------
程序启动,进入loading界面,
loading界面显示背景图 及 进度条动画,
后台启动线程进行相应的初始化操作,
loading界面更新相应的初始化提示信息,
初始化完成,打开并进入主界面,关闭loading界面,
如果初始化超时,则弹出提示,退出程序。
loading.java
------------
package com.hello;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Window;
import android.widget.TextView;
import android.widget.Toast;
public class loading extends Activity {
int MSG_INIT_OK = 1;
int MSG_INIT_INFO = 2;
int MSG_INIT_TIMEOUT = 9;
boolean isTimeout = false;
TextView tvInfo ;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.loading);
tvInfo = (TextView)findViewById(R.id.tvInfo);
initSystem();
}
private void initSystem(){
initThread();
mHandler.postDelayed(timeOutTask,60000);//60秒超时
}
public Handler mHandler = new Handler(){
public void handleMessage(Message msg){
if(msg.what == MSG_INIT_TIMEOUT){
if (mHandler != null && timeOutTask != null ){
mHandler.removeCallbacks(timeOutTask);
}
Toast.makeText(loading.this, "timeout", Toast.LENGTH_LONG).show();
loading.this.finish();
}else if(msg.what == MSG_INIT_OK){
if (mHandler != null && timeOutTask != null ){
mHandler.removeCallbacks(timeOutTask);
}
startActivity(new Intent(getApplication(),MainActivity.class));
loading.this.finish();
}else if(msg.what == MSG_INIT_INFO){
String info = msg.obj.toString();
tvInfo.setText(info);
}
}
};
Runnable timeOutTask = new Runnable() {
public void run() {
isTimeout = true;
Message msg = Message.obtain();
msg.what = MSG_INIT_TIMEOUT;
mHandler.sendMessage(msg);
}
};
private void initThread(){
new Thread(){
public void run() {
try {
if(!isTimeout){
sendInitInfo("初始化 step 1");
Thread.sleep(1000);//TODO 1
}
if(!isTimeout){
sendInitInfo("初始化 step 2");
Thread.sleep(2000);//TODO 2
}
if(!isTimeout){
sendInitInfo("初始化 step 3");
Thread.sleep(3000);//TODO 2
}
if(!isTimeout){
//初始化完成
sendInitInfo("初始化完成");
Message msg2 = Message.obtain();
msg2.what = MSG_INIT_OK;
mHandler.sendMessage(msg2);
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}
private void sendInitInfo(String info){
Message msg1 = Message.obtain();
msg1.what = MSG_INIT_INFO;
msg1.obj = info;
mHandler.sendMessage(msg1);
}
}
res/layout/loading.xml
----------------------
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:background="@drawable/pf_loading_bg" android:orientation="horizontal">
<TableLayout android:layout_width="match_parent"
android:layout_height="match_parent">
<TableRow>
<ProgressBar android:id="@+id/progressBar1"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:paddingTop="10dip" android:paddingLeft="70dip"
android:paddingRight="70dip" style="@style/loading">
</ProgressBar>
</TableRow>
<TableRow>
<TextView android:text="TextView" android:layout_height="wrap_content"
android:id="@+id/tvInfo" android:layout_width="wrap_content"></TextView>
</TableRow>
</TableLayout>
</LinearLayout>
res/values/mystyle.xml
----------------------
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="loading" parent="@android:style/Widget.ProgressBar.Large">
<item name="android:indeterminateDrawable">@anim/loading</item>
</style>
</resources>
res/anim/loading.xml
--------------------
<?xml version="1.0" encoding="utf-8"?>
<animation-list android:oneshot="false"
xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:duration="100" android:drawable="@drawable/loading1" />
<item android:duration="100" android:drawable="@drawable/loading2" />
<item android:duration="100" android:drawable="@drawable/loading3" />
</animation-list>
res/drawable-hdpi/
-------------------
loading_bg.png ,
loading1.png , loading2.png ,loading3.png
AndroidMainfest.xml
-------------------
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hello"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".MainActivity"
android:label="@string/app_name">
</activity>
<activity android:name=".loading">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>