问题与解决
在Android应用的开发中OA幸运飞艇源码出售QQ2952777280【话仙源码论坛】hxforum.com,有一些需求需要我们获取到输入法的高度,但是官方的API并没有提供类似的方法,所以我们需要自己来实现。
查阅了网上很多资料,试过以后都不理想。
比如有的方法通过监听布局的变化来计算输入法的高度,这种方式在Activity的配置中配置为"android:windowSoftInputMode="adjustResize""时没有问题,可以正确获取输入法的高度,因为布局此时确实会动态的调整。
但是当Activity配置为"android:windowSoftInputMode="adjustNothing""时,布局不会在输入法弹出时进行调整,上面的方式就会扑街。
不过经过一番探索和测试,终于发现了一种方式可以在即使设置为adjustNothing时也可以正确计算高度放方法。
同时也感谢这位外国朋友:
GitHub地址
其实也就两个类,我也做了一些修改,解决了一些问题,这里也贴出来:
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 {扫描二维码关注公众号,回复: 3599724 查看本文章/* 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
此处以在Activity中的使用进行举例。
实现接口
引入这两个类后,在当前Activity中实现接口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);
}
定义并初始化
在当前Activity定义成员变量,并在onCreate()中进行初始化
private KeyboardHeightProvider mKeyboardHeightProvider;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
...
mKeyboardHeightProvider = new KeyboardHeightProvider(this);
new Handler().post(() -> mKeyboardHeightProvider.start());
}
生命周期处理
初始化完成后,我们要在Activity中的生命周期中也要进行处理,以免内存泄露。
@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();
}
总结
此时我们就可以正确获取的当前输入法的高度了,即使android:windowSoftInputMode="adjustNothing"时也可以正确获取到,这正是这个方法的强大之处,利用这个方法可以实现比如类似微信聊天的界面,流畅切换输入框,表情框等。