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>