Android横竖屏幕切换生命周期详解

程序员文章站 2024-01-27 10:59:10

一、简介二、代码 /activitylifecycle_3screen/androidmanifest.xml

一、简介

Android横竖屏幕切换生命周期详解

二、代码

Android横竖屏幕切换生命周期详解

/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

Android横竖屏幕切换生命周期详解

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>

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