android viewflipper根据横竖屏加载不同图片

android studio版本：2021.2.1

例程名称：landscape2portait

完成日期：23.2.5

功能：viewflipper根据横竖屏加载不同图片

关键点：

1. 加载的图片以数组定义：private final int[] images = new int[]{R.drawable.a1, R.drawable.a2, R.drawable.a3,R.drawable.b1,R.drawable.b2,R.drawable.b3};

2. 第一次启动时根据当时屏幕方向加载图片（横屏加载横向图片，坚屏加载坚向图片）

3. 当蓝屏旋转的时候，根据方向加载不同图片。加载前要删除原图片。

4. 一个自定义函数，一个重载onConfigrationChanged.

5. 其他关于viewflipper的资料见：

app背景轮换，viewflipper详细实现方法（两种）（食人牙慧，备忘）

特别注意事项：图片不能太大，1080图3张就会oom(内存溢出）我这三张图加一起到不1M。

全部代码（为了效果使用的是全屏布局，原来代码较多，要注意分辨）：

FullScreenActivity.java（解释看注释）

/*
完成日期：2023.2.5
功能：viewflipper横坚屏加载不同图片。*/
package com.example.landscape2portait;import android.annotation.SuppressLint;import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;import android.content.res.Configuration;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowInsets;
import android.widget.ImageView;
import android.widget.ViewFlipper;import com.example.landscape2portait.databinding.ActivityFullscreenBinding;/*** An example full-screen activity that shows and hides the system UI (i.e.* status bar and navigation/system bar) with user interaction.*/
public class FullscreenActivity extends AppCompatActivity {private final int[] images = new int[]{R.drawable.a1, R.drawable.a2, R.drawable.a3,R.drawable.b1,R.drawable.b2,R.drawable.b3};/*** Whether or not the system UI should be auto-hidden after* {@link #AUTO_HIDE_DELAY_MILLIS} milliseconds.*/private static final boolean AUTO_HIDE = true;/*** If {@link #AUTO_HIDE} is set, the number of milliseconds to wait after* user interaction before hiding the system UI.*/private static final int AUTO_HIDE_DELAY_MILLIS = 3000;/*** Some older devices needs a small delay between UI widget updates* and a change of the status and navigation bar.*/private static final int UI_ANIMATION_DELAY = 300;private final Handler mHideHandler = new Handler(Looper.myLooper());private View mContentView;private final Runnable mHidePart2Runnable = new Runnable() {@SuppressLint("InlinedApi")@Overridepublic void run() {// Delayed removal of status and navigation barif (Build.VERSION.SDK_INT >= 30) {mContentView.getWindowInsetsController().hide(WindowInsets.Type.statusBars() | WindowInsets.Type.navigationBars());} else {// Note that some of these constants are new as of API 16 (Jelly Bean)// and API 19 (KitKat). It is safe to use them, as they are inlined// at compile-time and do nothing on earlier devices.mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LOW_PROFILE| View.SYSTEM_UI_FLAG_FULLSCREEN| View.SYSTEM_UI_FLAG_LAYOUT_STABLE| View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION| View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);}}};private View mControlsView;private final Runnable mShowPart2Runnable = new Runnable() {@Overridepublic void run() {// Delayed display of UI elementsActionBar actionBar = getSupportActionBar();if (actionBar != null) {actionBar.show();}mControlsView.setVisibility(View.VISIBLE);}};private boolean mVisible;private final Runnable mHideRunnable = new Runnable() {@Overridepublic void run() {hide();}};/*** Touch listener to use for in-layout UI controls to delay hiding the* system UI. This is to prevent the jarring behavior of controls going away* while interacting with activity UI.*/private final View.OnTouchListener mDelayHideTouchListener = new View.OnTouchListener() {@Overridepublic boolean onTouch(View view, MotionEvent motionEvent) {switch (motionEvent.getAction()) {case MotionEvent.ACTION_DOWN:if (AUTO_HIDE) {delayedHide(AUTO_HIDE_DELAY_MILLIS);}break;case MotionEvent.ACTION_UP:view.performClick();break;default:break;}return false;}};private ActivityFullscreenBinding binding;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding = ActivityFullscreenBinding.inflate(getLayoutInflater());setContentView(binding.getRoot());mVisible = true;mControlsView = binding.fullscreenContentControls;mContentView = binding.fullscreenContent;// Set up the user interaction to manually show or hide the system UI.mContentView.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {toggle();}});// Upon interacting with UI controls, delay any scheduled hide()// operations to prevent the jarring behavior of controls going away// while interacting with the UI.binding.dummyButton.setOnTouchListener(mDelayHideTouchListener);//根据屏幕横竖状态加载图片screenStatus();}@Overrideprotected void onPostCreate(Bundle savedInstanceState) {super.onPostCreate(savedInstanceState);// Trigger the initial hide() shortly after the activity has been// created, to briefly hint to the user that UI controls// are available.delayedHide(100);}//屏幕横竖屏切换时加载不同图片，onConfigurationChanged为屏幕切换监听@Overridepublic void onConfigurationChanged(Configuration newConfig) {super.onConfigurationChanged(newConfig);//这行很重要。ViewFlipper vflp_help = (ViewFlipper) findViewById(R.id.vflp_help);vflp_help.startFlipping();//切换屏幕if (newConfig.orientation == this.getResources().getConfiguration().ORIENTATION_PORTRAIT) {//如果是坚屏//删除三个图片，index只能为0，估计删除一个后，之前的就变为0//三个图片删除三次。（因系统启动时就加载了图片，所以无论横竖屏，都要删除操作。）vflp_help.removeViewAt(0);vflp_help.removeViewAt(0);vflp_help.removeViewAt(0);//动态加载3个图，因为images里有6张图，前三张是横屏图，后三张是坚屏，所以要从第3张加载。//切换横屏for (int i = 3; i < images.length; i++) {ImageView iv = new ImageView(this);iv.setBackgroundResource(images[i]);//动态加载vflp_help.addView(iv);}vflp_help.setAutoStart(true);vflp_help.setFlipInterval(1000*5);//轮换时间为5秒}//切换为横屏时else if (newConfig.orientation == this.getResources().getConfiguration().ORIENTATION_LANDSCAPE) {vflp_help.removeViewAt(0);vflp_help.removeViewAt(0);vflp_help.removeViewAt(0);for (int i = 0; i < images.length-3; i++) {ImageView iv = new ImageView(this);iv.setBackgroundResource(images[i]);vflp_help.addView(iv);}vflp_help.setAutoStart(true);vflp_help.setFlipInterval(1000*5);}}private void toggle() {if (mVisible) {hide();} else {show();}}private void hide() {// Hide UI firstActionBar actionBar = getSupportActionBar();if (actionBar != null) {actionBar.hide();}mControlsView.setVisibility(View.GONE);mVisible = false;// Schedule a runnable to remove the status and navigation bar after a delaymHideHandler.removeCallbacks(mShowPart2Runnable);mHideHandler.postDelayed(mHidePart2Runnable, UI_ANIMATION_DELAY);}private void show() {// Show the system barif (Build.VERSION.SDK_INT >= 30) {mContentView.getWindowInsetsController().show(WindowInsets.Type.statusBars() | WindowInsets.Type.navigationBars());} else {mContentView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN| View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION);}mVisible = true;// Schedule a runnable to display UI elements after a delaymHideHandler.removeCallbacks(mHidePart2Runnable);mHideHandler.postDelayed(mShowPart2Runnable, UI_ANIMATION_DELAY);}/*** Schedules a call to hide() in delay milliseconds, canceling any* previously scheduled calls.*/private void delayedHide(int delayMillis) {mHideHandler.removeCallbacks(mHideRunnable);mHideHandler.postDelayed(mHideRunnable, delayMillis);}public void screenStatus() {ViewFlipper vflp_help = (ViewFlipper) findViewById(R.id.vflp_help);vflp_help.startFlipping();Configuration mConfiguration = this.getResources().getConfiguration(); //获取配置信息int ori = mConfiguration.orientation; //获取屏幕方向if (ori == mConfiguration.ORIENTATION_LANDSCAPE) {for (int i = 0; i < images.length - 3; i++) {ImageView iv = new ImageView(this);iv.setBackgroundResource(images[i]);vflp_help.addView(iv);}vflp_help.setAutoStart(true);vflp_help.setFlipInterval(1000 * 5);} else  {for (int i = 3; i < images.length; i++) {ImageView iv = new ImageView(this);iv.setBackgroundResource(images[i]);vflp_help.addView(iv);}vflp_help.setAutoStart(true);vflp_help.setFlipInterval(1000 * 5);}}
}

activity_fullscreen.xml

其他代码见：app背景轮换，viewflipper详细实现方法（两种）（食人牙慧，备忘）（第二个方法）

文件位置：

动图展示：（横坚屏切换的时候还有点问题，现在还不知道怎么解决。）

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