Android Activity 切屏处理

1. XML Layouts
首先在目录 “res/layout/” 下创建两个XML layout文件 :

res/layout/activity_main.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=".MainActivity" >

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

</RelativeLayout>

res/layout/activity_other.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" >

	<TextView android:layout_width="match_parent"
	    android:layout_height="match_parent"
	    android:text="@string/second_page"/>
</LinearLayout>

2. Activities
创建两个activity类

MainActivity.java –> activity_main.xml
OtherActivity.java –> activity_other.xml

切换关键代码
Intent intent = new Intent(MainActivity.this, OtherActivity.class);
startActivity(intent);

MainActivity.java
package com.lance.changescreen;

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

public class MainActivity extends Activity {
	private TextView mTextView;

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

		mTextView = (TextView)findViewById(R.id.text_view);
		addTextViewListener();
	}

	/**
	 * 点击mTextView, 切换到另外一个屏幕
	 */
	private void addTextViewListener() {
		mTextView.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				Intent intent = new Intent(MainActivity.this, OtherActivity.class);
				startActivity(intent);
			}
		});
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

OtherActivity.java
package com.lance.changescreen;

import android.app.Activity;
import android.os.Bundle;

public class OtherActivity extends Activity {

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_other);
	}
}

3. AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.lance.changescreen"
    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.lance.changescreen.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>
        <!-- add OtherActivity-->
        <activity android:label="@string/app_name"
            android:name="com.lance.changescreen.OtherActivity"/>
    </application>

</manifest>