Android横竖屏幕切换生命周期详解

一、简介

二、代码

/activityLifeCycle_3Screen/AndroidManifest.xml

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

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。