Android開發OA幸運飛艇原始碼出售 - 獲取系統輸入法高度的正確姿勢
問題與解決
在Android應用的開發中OA幸運飛艇原始碼出售QQ2952777280【話仙原始碼論壇】hxforum.com，有一些需求需要我們獲取到輸入法的高度，但是官方的API並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，試過以後都不理想。
比如有的方法通過監聽佈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，因為佈局此時確實會動態的調整。
但是當Activity配置為"android:windowSoftInputMode="adjustNothing""時，佈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，終於發現了一種方式可以在即使設定為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
其實也就兩個類，我也做了一些修改，解決了一些問題，這裡也貼出來：
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。
實現介面
引入這兩個類後，在當前Activity中實現介面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);
}
定義並初始化
在當前Activity定義成員變數，並在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());
}
生命週期處理
初始化完成後，我們要在Activity中的生命週期中也要進行處理，以免記憶體洩露。
@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();
}
總結
此時我們就可以正確獲取的當前輸入法的高度了，即使android:windowSoftInputMode="adjustNothing"時也可以正確獲取到，這正是這個方法的強大之處，利用這個方法可以實現比如類似微信聊天的介面，流暢切換輸入框，表情框等。