Android横竖屏幕切换生命周期详解

一、简介

二、代码

/activityLifeCycle_3Screen/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.fry.activityLifeCycle_3Screen"
 android:versionCode="1"
 android:versionName="1.0" >

<uses-sdk
   android:minSdkVersion="8"
   android:targetSdkVersion="19" />

<application
   android:allowBackup="true"
   android:icon="@drawable/ic_launcher"
   android:label="@string/app_name"
   android:theme="@style/AppTheme" >
   <activity
     android:configChanges="keyboardHidden|orientation|screenSize"
     android:name="com.fry.activityLifeCycle_3Screen.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.fry.activityLifeCycle_3Screen.Activity01" ></activity>
   <activity android:name="com.fry.activityLifeCycle_3Screen.Activity02" android:theme="@android:style/Theme.Translucent" ></activity>
 </application>

</manifest>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.fry.activityLifeCycle_3Screen"
 android:versionCode="1"
 android:versionName="1.0" >

<uses-sdk
   android:minSdkVersion="8"
   android:targetSdkVersion="19" />

<application
   android:allowBackup="true"
   android:icon="@drawable/ic_launcher"
   android:label="@string/app_name"
   android:theme="@style/AppTheme" >
   <activity
     android:configChanges="keyboardHidden|orientation|screenSize"
     android:name="com.fry.activityLifeCycle_3Screen.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.fry.activityLifeCycle_3Screen.Activity01" ></activity>
   <activity android:name="com.fry.activityLifeCycle_3Screen.Activity02" android:theme="@android:style/Theme.Translucent" ></activity>
 </application>

</manifest>

核心代码：android:configChanges="keyboardHidden|orientation|screenSize"

com.fry.activityLifeCycle_3Screen.MainActivity

package com.fry.activityLifeCycle_3Screen;

import com.fry.activityLifeCycle_3Screen.R;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{
 private Button btn_pause;//创建一个button对象
 private Button btn_stop;
 private Button btn_offLine;
 private String tag=MainActivity.class.getSimpleName();
  protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);//父类操作
     setContentView(R.layout.activity_main);//引入名为activity_main的界面
     btn_pause=(Button) findViewById(R.id.btn_pause);//找id为btn_pause的button
     btn_stop=(Button) findViewById(R.id.btn_stop);//找id为btn_stop的button
     btn_offLine=(Button) findViewById(R.id.btn_offLine);
     btn_pause.setOnClickListener(this);
     btn_stop.setOnClickListener(this);
     btn_offLine.setOnClickListener(this);
     /*
      * activity被创建时执行
      */
     Log.d(tag, "onCreate");

}
  /*
  * activity可见时执行
  */
  @Override
 protected void onStart() {
   // TODO Auto-generated method stub
   super.onStart();
   Log.d(tag, "onStart");
 }

/*
  * activity交互时执行
  */
 @Override
 protected void onResume() {
   // TODO Auto-generated method stub
   super.onResume();
   Log.d(tag, "onResume");
 }
 /*
  * activity重新可见时执行
  */
 @Override
 protected void onRestart() {
   // TODO Auto-generated method stub
   super.onRestart();
   Log.d(tag, "onRestart");  
 }
 /*
  * activity暂停时执行
  */
 @Override
 protected void onPause() {
   // TODO Auto-generated method stub
   super.onPause();
   Log.d(tag, "onPause");
 }
 /*
  * activity停止时执行
  */
 @Override
 protected void onStop() {
   // TODO Auto-generated method stub
   super.onStop();
   Log.d(tag, "onStop");
 }
 /*
  * activity销毁时执行
  */
 @Override
 protected void onDestroy() {
   // TODO Auto-generated method stub
   super.onDestroy();
   Log.d(tag, "onDestroy");
 }
 /*
  * activity在配置改变时执行
  * 比如横竖屏幕的切换，键盘有无的切换，屏幕大小的改变
  */
 @Override
 public void onConfigurationChanged(Configuration newConfig) {
   // TODO Auto-generated method stub
   super.onConfigurationChanged(newConfig);
   Log.d(tag, "onConfigurationChanged");
 }
 @Override
 public void onClick(View v) {
   // TODO Auto-generated method stub
   switch (v.getId()) {
   case R.id.btn_pause:
     Intent intent=new Intent();
     intent.setClass(this, Activity02.class);
     startActivity(intent);
     break;
   case R.id.btn_stop:
     Intent intent2=new Intent();
     intent2.setClass(this, Activity01.class);
     startActivity(intent2);
     break;
   case R.id.btn_offLine://断开状态
     finish();
   default:
     break;
   }
 }
}

三、一直横屏或者一直竖屏

很多手机游戏里面一进去就是横屏，而且不能切换为竖屏，那么怎么样达到这样的效果呢？

 /activityLifeCycle_3Screen/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.fry.activityLifeCycle_3Screen"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="19" />

<application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <activity
  android:screenOrientation="portrait"
  android:name="com.fry.activityLifeCycle_3Screen.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.fry.activityLifeCycle_3Screen.Activity01" ></activity>
 <activity android:name="com.fry.activityLifeCycle_3Screen.Activity02" android:theme="@android:style/Theme.Translucent" ></activity>
</application>

</manifest>

android:screenOrientation="landscape"横屏
android:screenOrientation="portrait"竖屏

四、如何获取手机是横屏还是竖屏

com.fry.activityLifeCycle_3Screen.MainActivity

package com.fry.activityLifeCycle_3Screen;
import com.fry.activityLifeCycle_3Screen.R;

import android.app.Activity;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{
private Button btn_pause;//创建一个button对象
private Button btn_stop;
private Button btn_offLine;
private String tag=MainActivity.class.getSimpleName();
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);//父类操作
  setContentView(R.layout.activity_main);//引入名为activity_main的界面
  btn_pause=(Button) findViewById(R.id.btn_pause);//找id为btn_pause的button
  btn_stop=(Button) findViewById(R.id.btn_stop);//找id为btn_stop的button
  btn_offLine=(Button) findViewById(R.id.btn_offLine);
  btn_pause.setOnClickListener(this);
  btn_stop.setOnClickListener(this);
  btn_offLine.setOnClickListener(this);
  /*
   * activity被创建时执行
   */
  Log.d(tag, "onCreate");

}
 /*
 * activity可见时执行
 */
 @Override
protected void onStart() {
 // TODO Auto-generated method stub
 super.onStart();
 Log.d(tag, "onStart");
}

/*
 * activity交互时执行
 */
@Override
protected void onResume() {
 // TODO Auto-generated method stub
 super.onResume();
 Log.d(tag, "onResume");
}
/*
 * activity重新可见时执行
 */
@Override
protected void onRestart() {
 // TODO Auto-generated method stub
 super.onRestart();
 Log.d(tag, "onRestart");
}
/*
 * activity暂停时执行
 */
@Override
protected void onPause() {
 // TODO Auto-generated method stub
 super.onPause();
 Log.d(tag, "onPause");
}
/*
 * activity停止时执行
 */
@Override
protected void onStop() {
 // TODO Auto-generated method stub
 super.onStop();
 Log.d(tag, "onStop");
}
/*
 * activity销毁时执行
 */
@Override
protected void onDestroy() {
 // TODO Auto-generated method stub
 super.onDestroy();
 Log.d(tag, "onDestroy");
}
/*
 * activity在配置改变时执行
 * 比如横竖屏幕的切换，键盘有无的切换，屏幕大小的改变
 */
@Override
public void onConfigurationChanged(Configuration newConfig) {
 // TODO Auto-generated method stub
 super.onConfigurationChanged(newConfig);
 Log.d(tag, "onConfigurationChanged");
 int width=getWindowManager().getDefaultDisplay().getWidth();
 int height=getWindowManager().getDefaultDisplay().getHeight();
 if(width>height) Log.d(tag, "landscape");
 else Log.d(tag, "portrait");
}
@Override
public void onClick(View v) {
 // TODO Auto-generated method stub
 switch (v.getId()) {
 case R.id.btn_pause:
  Intent intent=new Intent();
  intent.setClass(this, Activity02.class);
  startActivity(intent);
  break;
 case R.id.btn_stop:
  Intent intent2=new Intent();
  intent2.setClass(this, Activity01.class);
  startActivity(intent2);
  break;
 case R.id.btn_offLine://断开状态
  finish();
 default:
  break;
 }
}
}

/activityLifeCycle_3Screen/AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.fry.activityLifeCycle_3Screen"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
 android:minSdkVersion="8"
 android:targetSdkVersion="19" />

<application
 android:allowBackup="true"
 android:icon="@drawable/ic_launcher"
 android:label="@string/app_name"
 android:theme="@style/AppTheme" >
 <activity
  android:configChanges="keyboardHidden|orientation|screenSize"
  android:name="com.fry.activityLifeCycle_3Screen.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.fry.activityLifeCycle_3Screen.Activity01" ></activity>
 <activity android:name="com.fry.activityLifeCycle_3Screen.Activity02" android:theme="@android:style/Theme.Translucent" ></activity>
</application>

</manifest>

来源：http://www.cnblogs.com/Renyi-Fan/archive/2017/07/30/7259702.html