前言：

android上獲取對(duì)軟鍵盤的處理一直都是個(gè)頭疼的問(wèn)題，基本都是通過(guò)對(duì)view設(shè)置addOnGlobalLayoutListener來(lái)進(jìn)行監(jiān)聽，但這個(gè)監(jiān)聽有很多問(wèn)題，比如調(diào)用任意view的layout此函數(shù)就會(huì)進(jìn)行回調(diào)，而且計(jì)算高度的時(shí)候經(jīng)常會(huì)因?yàn)橐恍顟B(tài)欄，導(dǎo)航欄的顯示造成軟鍵盤高度計(jì)算錯(cuò)誤的問(wèn)題。最終這個(gè)問(wèn)題在android 11上得到了解決，可以通過(guò)調(diào)用setWindowInsetsAnimationCallback設(shè)置對(duì)系統(tǒng)UI的顯示隱藏進(jìn)行監(jiān)聽。

實(shí)現(xiàn)效果：

導(dǎo)入依賴：

由于setWindowInsetsAnimationCallback方法在android 11上才出現(xiàn)，對(duì)于低版本手機(jī)我們?cè)撊绾翁幚?，google對(duì)此進(jìn)行了兼容，我們需要在項(xiàng)目中添加androidX core的最新版，就可以調(diào)用向下兼容的api

implementation "androidx.core:core:1.5.0-beta02"

創(chuàng)建callback：

首先我們創(chuàng)建類RootViewDeferringInsetsCallback繼承自WindowInsetAnimationCompat.Callback同時(shí)實(shí)現(xiàn)OnAppWindowInsetsListener。

onApplyWindowInsets（此方法屬于OnAppWindowInsetsListener）

在此方法中，我們獲取到實(shí)時(shí)變化的windowInsets，用來(lái)進(jìn)行可見性判斷和后續(xù)的分發(fā)

onPrepare（系統(tǒng)ui動(dòng)畫開始）

在此方法中，我們獲取到當(dāng)前正在進(jìn)行動(dòng)畫的類型，判斷是軟鍵盤的情況下設(shè)置deferredInsets為true并可以通過(guò)WindowInsets判斷軟鍵盤是否可見

onProgress（系統(tǒng)ui動(dòng)畫過(guò)程）

此處對(duì)軟鍵盤和系統(tǒng)bar進(jìn)行處理并獲取到實(shí)時(shí)高度

onEnd（系統(tǒng)ui動(dòng)畫結(jié)束）

在此方法中，我們對(duì)deferedInsets設(shè)置為false并對(duì)insets進(jìn)行分發(fā)

public class RootViewDeferringInsetsCallback extends WindowInsetsAnimationCompat.Callback implements OnApplyWindowInsetsListener {
private final KeyboardListener keyboardListener;

public RootViewDeferringInsetsCallback(int dispatchMode, KeyboardListener keyboardListener) {
    super(dispatchMode);
    this.keyboardListener = keyboardListener;
}

private View view;
private WindowInsetsCompat lastWindowInsets;

private boolean deferredInsets = false;


@Override
public WindowInsetsCompat onApplyWindowInsets(View v, WindowInsetsCompat insets) {
    view = v;
    lastWindowInsets = insets;
    return WindowInsetsCompat.CONSUMED;
}

@Override
public void onPrepare(@NonNull WindowInsetsAnimationCompat animation) {
    if ((animation.getTypeMask() & WindowInsetsCompat.Type.ime()) != 0) {
        deferredInsets = true;
        boolean visible = false;
        if(lastWindowInsets!=null) {
            visible =  lastWindowInsets.isVisible(WindowInsetsCompat.Type.ime());
        }
        keyboardListener.onKeyBoardAnimStart(visible);
    }
}

@NonNull
@Override
public WindowInsetsCompat onProgress(@NonNull WindowInsetsCompat insets, @NonNull List<WindowInsetsAnimationCompat> runningAnimations) {
    if (deferredInsets) {
        //處理其他系統(tǒng)bar和軟鍵盤同時(shí)顯示情況高度計(jì)算問(wèn)題
        Insets typesInset = insets.getInsets(WindowInsetsCompat.Type.ime());

        Insets otherInset = insets.getInsets(WindowInsetsCompat.Type.systemBars());


        Insets subtract = Insets.subtract(typesInset, otherInset);
        Insets diff = Insets.max(subtract, Insets.NONE);
        //獲取實(shí)時(shí)高度變化
        int height = diff.bottom;
    }
    return insets;
}

@Override
public void onEnd(@NonNull WindowInsetsAnimationCompat animation) {
    if (deferredInsets && (animation.getTypeMask() & WindowInsetsCompat.Type.ime()) != 0) {
        deferredInsets = false;
        boolean visible = false;
       
        //軟鍵盤是否顯示
        if(lastWindowInsets!=null) {
            visible =  lastWindowInsets.isVisible(WindowInsetsCompat.Type.ime());
        }
        //分發(fā)insets
       
        if (lastWindowInsets != null) {
            ViewCompat.dispatchApplyWindowInsets(view, lastWindowInsets);
        }
    }
}

}
設(shè)置監(jiān)聽

最后我們調(diào)用ViewCompat傳入任意view設(shè)置監(jiān)聽即可

RootViewDeferringInsetsCallback rootViewInsetsCallback = new RootViewDeferringInsetsCallback(WindowInsetsAnimationCompat.Callback.DISPATCH_MODE_CONTINUE_ON_SUBTREE, keyBoardListener);
ViewCompat.setOnApplyWindowInsetsListener(view, rootViewInsetsCallback);
ViewCompat.setWindowInsetsAnimationCallback(view, rootViewInsetsCallback);
其他

除了對(duì)軟鍵盤的監(jiān)聽以外，我們還可以對(duì)任意系統(tǒng)ui進(jìn)行顯示和隱藏，或者進(jìn)行動(dòng)畫操作?？梢酝ㄟ^(guò)WindowCompat.getInsetsController()方法拿到view的insets控制器。有很多非常方便的方法，感興趣的小伙伴可以進(jìn)行探究。

為了方便大家，我對(duì)軟鍵盤的監(jiān)聽進(jìn)行了封裝并上傳了git，此依賴可以在任意地方進(jìn)行軟鍵盤高度的監(jiān)聽，并且可以設(shè)置任意view進(jìn)行跟隨平移，大家可以直接添加依賴進(jìn)行使用~

https://github.com/rockscy/uicontroll