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小編給大家分享一下Android開發中怎么獲取系統輸入法高度,相信大部分人都還不怎么了解,因此分享這篇文章給大家參考一下,希望大家閱讀完這篇文章后大有收獲,下面讓我們一起去了解一下吧!
問題與解決
在Android應用的開發中,有一些需求需要我們獲取到輸入法的高度,但是官方的API并沒有提供類似的方法,所以我們需要自己來實現。
查閱了網上很多資料,試過以后都不理想。
比如有的方法通過監聽布局的變化來計算輸入法的高度,這種方式在Activity的配置中配置為"android:windowSoftInputMode="adjustResize""
時沒有問題,可以正確獲取輸入法的高度,因為布局此時確實會動態的調整。
但是當Activity配置為"android:windowSoftInputMode="adjustNothing""
時,布局不會在輸入法彈出時進行調整,上面的方式就會撲街。
不過經過一番探索和測試,終于發現了一種方式可以在即使設置為adjustNothing時也可以正確計算高度放方法。
同時也感謝這位外國朋友:
GitHub地址
方法如下
其實也就兩個類,我也做了一些修改,解決了一些問題,這里也貼出來:
KeyboardHeightObserver.java
/** * The observer that will be notified when the height of * the keyboard has changed */ public interface KeyboardHeightObserver { /** * Called when the keyboard height has changed, 0 means keyboard is closed, * >= 1 means keyboard is opened. * * @param height The height of the keyboard in pixels * @param orientation The orientation either: Configuration.ORIENTATION_PORTRAIT or * Configuration.ORIENTATION_LANDSCAPE */ void onKeyboardHeightChanged(int height, int orientation); }
KeyboardHeightProvider.java
/** * The keyboard height provider, this class uses a PopupWindow * to calculate the window height when the floating keyboard is opened and closed. */ public class KeyboardHeightProvider extends PopupWindow { /** The tag for logging purposes */ private final static String TAG = "sample_KeyboardHeightProvider"; /** The keyboard height observer */ private KeyboardHeightObserver observer; /** The cached landscape height of the keyboard */ private int keyboardLandscapeHeight; /** The cached portrait height of the keyboard */ private int keyboardPortraitHeight; /** The view that is used to calculate the keyboard height */ private View popupView; /** The parent view */ private View parentView; /** The root activity that uses this KeyboardHeightProvider */ private Activity activity; /** * Construct a new KeyboardHeightProvider * * @param activity The parent activity */ public KeyboardHeightProvider(Activity activity) { super(activity); this.activity = activity; LayoutInflater inflator = (LayoutInflater) activity.getSystemService(Activity.LAYOUT_INFLATER_SERVICE); this.popupView = inflator.inflate(R.layout.keyboard_popup_window, null, false); setContentView(popupView); setSoftInputMode(LayoutParams.SOFT_INPUT_ADJUST_RESIZE | LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE); setInputMethodMode(PopupWindow.INPUT_METHOD_NEEDED); parentView = activity.findViewById(android.R.id.content); setWidth(0); setHeight(LayoutParams.MATCH_PARENT); popupView.getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() { @Override public void onGlobalLayout() { if (popupView != null) { handleOnGlobalLayout(); } } }); } /** * Start the KeyboardHeightProvider, this must be called after the onResume of the Activity. * PopupWindows are not allowed to be registered before the onResume has finished * of the Activity. */ public void start() { if (!isShowing() && parentView.getWindowToken() != null) { setBackgroundDrawable(new ColorDrawable(0)); showAtLocation(parentView, Gravity.NO_GRAVITY, 0, 0); } } /** * Close the keyboard height provider, * this provider will not be used anymore. */ public void close() { this.observer = null; dismiss(); } /** * Set the keyboard height observer to this provider. The * observer will be notified when the keyboard height has changed. * For example when the keyboard is opened or closed. * * @param observer The observer to be added to this provider. */ public void setKeyboardHeightObserver(KeyboardHeightObserver observer) { this.observer = observer; } /** * Get the screen orientation * * @return the screen orientation */ private int getScreenOrientation() { return activity.getResources().getConfiguration().orientation; } /** * Popup window itself is as big as the window of the Activity. * The keyboard can then be calculated by extracting the popup view bottom * from the activity window height. */ private void handleOnGlobalLayout() { Point screenSize = new Point(); activity.getWindowManager().getDefaultDisplay().getSize(screenSize); Rect rect = new Rect(); popupView.getWindowVisibleDisplayFrame(rect); // REMIND, you may like to change this using the fullscreen size of the phone // and also using the status bar and navigation bar heights of the phone to calculate // the keyboard height. But this worked fine on a Nexus. int orientation = getScreenOrientation(); int keyboardHeight = screenSize.y - rect.bottom; if (keyboardHeight == 0) { notifyKeyboardHeightChanged(0, orientation); } else if (orientation == Configuration.ORIENTATION_PORTRAIT) { this.keyboardPortraitHeight = keyboardHeight; notifyKeyboardHeightChanged(keyboardPortraitHeight, orientation); } else { this.keyboardLandscapeHeight = keyboardHeight; notifyKeyboardHeightChanged(keyboardLandscapeHeight, orientation); } } private void notifyKeyboardHeightChanged(int height, int orientation) { if (observer != null) { observer.onKeyboardHeightChanged(height, orientation); } } }
使用方法
此處以在Activity中的使用進行舉例。
實現接口
引入這兩個類后,在當前Activity中實現接口KeyboardHeightObserver:
@Override public void onKeyboardHeightChanged(int height, int orientation) { String or = orientation == Configuration.ORIENTATION_PORTRAIT ? "portrait" : "landscape"; Logger.d(TAG, "onKeyboardHeightChanged in pixels: " + height + " " + or); }
定義并初始化
在當前Activity定義成員變量,并在onCreate()中進行初始化
private KeyboardHeightProvider mKeyboardHeightProvider; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { ... mKeyboardHeightProvider = new KeyboardHeightProvider(this); new Handler().post(() -> mKeyboardHeightProvider.start()); }
生命周期處理
初始化完成后,我們要在Activity中的生命周期中也要進行處理,以免內存泄露。
@Override protected void onResume() { super.onResume(); mKeyboardHeightProvider.setKeyboardHeightObserver(this); } @Override protected void onPause() { super.onPause(); mKeyboardHeightProvider.setKeyboardHeightObserver(null); } @Override protected void onDestroy() { super.onDestroy(); mKeyboardHeightProvider.close(); }
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