android之启动桌面activity

主页面布局：layout\activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

<Button
        android:id="@+id/btnHome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="启动桌面Activity" />

</LinearLayout>

主页面java代码：

package com.sxt.day04_07_twoaction;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;

public class MainActivity extends Activity implements OnClickListener{

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setListener();
}

private void setListener() {
findViewById(R.id.btnHome).setOnClickListener(this);
}

@Override
public void onClick(View v) {
Intent intent=new Intent();
switch (v.getId()) {
case R.id.btnHome:
intent.addCategory(Intent.CATEGORY_HOME);
intent.setAction(Intent.ACTION_MAIN);
break;
}
startActivity(intent);
}
}

第二个acitivity布局：layout\activity_second.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    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=".SecondActivity" >

<TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/hello_world" />

</RelativeLayout>

第二个页面java代码：

package com.sxt.day04_07_twoaction;

import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;

public class SecondActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Log.i("main","SecondActivity");
}

}

列表清单：AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.sxt.day04_07_twoaction"
    android:versionCode="1"
    android:versionName="1.0" >

<uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.sxt.day04_07_twoaction.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.sxt.day04_07_twoaction.SecondActivity"
            android:label="@string/title_activity_second" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>
                <category android:name="android.intent.category.DEFAULT"/>
                <category android:name="android.intent.category.HOME"/>这两个就可以代表显示一个桌面
            </intent-filter>
        </activity>
    </application>

</manifest>