第一种：用两个activity实现
用Handler对象飞postDelayed方法来实现延迟跳转的目的；
补充：
1 // 立即执行Runnable对象
public final boolean post(Runnable r);
2 //在指定的时间uptimeMillis 执行Runnable对象
public final boolean postAtTime(Runnable r, long uptimeMillis);
3 // 在指定的时间间隔 delayMillis 执行Runnable对象
public final boolean postDelayed(Runnable r, long delayMillis);
1， activity_splash.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:orientation="vertical" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/ic_launcher"
android:contentDescription="@string/hello_world"/>
</LinearLayout>
2，activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.lyt.demo04_wakeuptimer.MainActivity" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</RelativeLayout>
3， SplashActivity.java
package com.lyt.demo04_wakeuptimer;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.Window;
public class SplashActivity extends Activity {
private final int SPLASH_DISPLAY_LENGHT=3000;
private Handler handler;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//隐藏标题栏
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
//加载布局文件
setContentView(R.layout.activity_splash);
handler=new Handler();
//延迟 SPLASH_DISPLAY_LENGHT时间然后跳转到MainActivity
handler.postDelayed(new Runnable() {
@Override
public void run() {
Intent intent =new Intent();
intent.setClass(SplashActivity.this, MainActivity.class);
startActivity(intent);
SplashActivity.this.finish();
}
}, SPLASH_DISPLAY_LENGHT);
}
/* 禁用返回键
*(non-Javadoc)
* @see android.app.Activity#onKeyDown(int, android.view.KeyEvent)
*/
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_BACK){
return true;
}
return super.onKeyDown(keyCode, event);
}
}
4， MainActivity.java
package com.lyt.demo04_wakeuptimer;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
/**
- @author Administrator
- 定时唤醒系统
- 1，定时唤醒系统
- 2，记录3G状态
- 3，记录GPS状态
- 4，
*/
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
5，修改AndroidManifest.xml文件：
...
2 <activity
3 android:name=".SplashActivity"
4 android:label="splash" >
5 <intent-filter>
6 <action android:name="android.intent.action.MAIN" />
7
8 <category android:name="android.intent.category.LAUNCHER" />
9 </intent-filter>
10 </activity>
11 <activity
12 android:name=".MainActivity"
13 android:label="@string/app_name" >
14 </activity>
15 ...
第二种：方法 用一个activity实现Splash启动界面
用一个Activity实现**
主要利用控件的隐藏来实现。
1、xml文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:id="@+id/splash_lt"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_launcher" />
</LinearLayout>
<TextView
android:id="@+id/main_tv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="这是主界面" />
</LinearLayout>
2、MainActivity
package com.example.splashtest2;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.SystemClock;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.Window;
import android.widget.LinearLayout;
public class MainActivity extends Activity {
private final int STOP_SPLASH = 0;
private final int SPLASH_TIME = 3000;
private LinearLayout splashLt;
private Handler splashHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case STOP_SPLASH:
splashLt.setVisibility(View.GONE);
break;
default:
break;
}
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
splashLt = (LinearLayout) findViewById(R.id.splash_lt);
Message msg = new Message();
msg.what = STOP_SPLASH;
// 注：这里必须用延迟发送消息的方法，否则ImageView不会显示出来
splashHandler.sendMessageDelayed(msg, SPLASH_TIME);
}
}
