如何让Android横竖屏切换时不销毁当前activity

Posted 2023-05-18

参考技术A manifest中为相应的Activity设置android:configChanges属性即可
Andorid
3.2以前的SDK可以使用如下配置
android:configChanges="orientation|keyboardHidden"
而Adnroid
3.2以后的SDK必须添加一个screenSize属性，具体如下
android:configChanges="keyboardHidden|orientation|screenSize"
或者
android:configChanges="orientation|screenSize"
对android:configChanges的总结
1、不设置Activity的android:configChanges时，切屏会重新调用各个生命周期，切横屏时会执行一次，切竖屏时会执行两次（在三星4.0设备上切横屏和竖屏都是执行一次，而并非这里说的有执行两次的情况）；
2、设置Activity的android:configChanges="orientation"时，切屏还是会重新调用各个生命周期，切横、竖屏时只会执行一次；
3、设置Activity的android:configChanges="orientation|keyboardHidden"时，切屏不会重新调用各个生命周期，只会执行onConfigurationChanged方法。
注：上述描述是在Android3.2以前，如果缺少了keyboardHidden选项，不能防止Activity的销毁重启，也就不能执行onConfigurationChanged方法了。在3.2之后，必须加上screenSize属性才可以屏蔽调用Activity的生命周期（一些设备上可以不需要keyboardHidden，只要screenSize就可以了，保守起见还是继续保留keyboardHidden吧）。

Android横竖屏切换小结

Android手机或平板都会存在横竖屏切换的功能，通常是由物理重力感应触发的，但是
有时候也不尽然，通常在设置里面我们可以对手机的横竖屏切换进行关闭。

AndroidManifest.xml

<activity
    android:name="com.google.android.gms.ads.AdActivity"
    android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
    android:theme="@android:style/Theme.Translucent" />

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.yanlei.yl7" >

    <!-- Include required permissions for Google Mobile Ads to run. -->
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.CHANGE_CONFIGURATION"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <!-- This meta-data tag is required to use Google Play Services. -->
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />

        <activity
            android:name=".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> <!-- Include the AdActivity configChanges and theme. -->


        <activity
            android:name="com.google.android.gms.ads.AdActivity"
            android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"
            android:theme="@android:style/Theme.Translucent" />
    </application>

</manifest>

　　

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"
    >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="获取Configuration信息"
        android:textSize="25sp"
        android:layout_marginTop="80dip"
        android:layout_centerHorizontal="true"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="测试ConfigurationChange"
        android:textSize="25sp"
        android:layout_centerInParent="true"
        android:id="@+id/mytext" />

</RelativeLayout>

MainActivity.java

package com.example.yanlei.yl7;

import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends AppCompatActivity {

    private Button mButton;
    private TextView pTextView;
    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        pTextView=(TextView)this.findViewById(R.id.mytext);
        System.out.println("---> onCreate()");
        init();
    }

    private void init() {
        mButton = (Button) findViewById(R.id.button);
        mButton.setOnClickListener(new ClickListenerImpl());
    }

    private class ClickListenerImpl implements OnClickListener {
        @Override
        public void onClick(View v) {
            getConfigurationInfo();
        }

    }

    private void getConfigurationInfo() {
        Configuration configuration = getResources().getConfiguration();
        //获取屏幕方向
        int l = configuration.ORIENTATION_LANDSCAPE;
        int p = configuration.ORIENTATION_PORTRAIT;
        if (configuration.orientation == l) {
            pTextView.setText("现在是横屏====");
            System.out.println("现在是横屏");
        }
        if (configuration.orientation == p) {
            pTextView.setText("现在是竖屏===");
            System.out.println("现在是竖屏");
        }

    }


    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        //newConfig.orientation获得当前屏幕状态是横向或者竖向
        //Configuration.ORIENTATION_PORTRAIT 表示竖向
        //Configuration.ORIENTATION_LANDSCAPE 表示横屏
        if(newConfig.orientation==Configuration.ORIENTATION_PORTRAIT){
            pTextView.setText("现在是竖屏");
            Toast.makeText(MainActivity.this, "现在是竖屏", Toast.LENGTH_SHORT).show();
        }
        if(newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE){
            pTextView.setText("现在是横屏");
            Toast.makeText(MainActivity.this, "现在是横屏", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString("name", "zxx");
        outState.putInt("id", 9527);
        System.out.println("---> onSaveInstanceState()");
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        String name = savedInstanceState.getString("name");
        int id = savedInstanceState.getInt("id");
        System.out.println("---> onRestoreInstanceState()");
        System.out.println("名字=" + name + ",编号=" + id);

    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}