Android Activity 切屏处置

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.javapackage 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.javapackage 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>