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>

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。