解决android 显示内容被底部导航栏遮挡的问题
作者：袖梨
2022-06-25
描述：
由于产品需求，要求含有EditText的界面全屏显示，最好的解决方式是使用AndroidBug5497Workaround.assistActivity(this)
的方式来解决，但是华为和魅族手机系统自带的有底部导航栏，会造成一些布局被遮挡。
解决方案：在values-21的style.xml中添加android:windowDrawsSystemBarBackgrounds”并将值设置为false，方式如下
在style引用的主题里面加入android:windowDrawsSystemBarBackgrounds”并将值设置为false，会自动提醒点击alt+Enter会新建values-21的文件夹并生成styles.xml的文件。
也可以自己忽略的，直接新建values-21的文件夹然后新建一个styles.xml的文件，将主题里面的内容复制到styles.xml里面然后加上加入android:windowDrawsSystemBarBackgrounds”并将值设置为false即可解决。
例外：附上（网上找到的）
public class AndroidBug5497Workaround {
// For more information, see https://code.google.com/p/android/issues/detail?id=5497
// To use this class, simply invoke assistActivity() on an Activity that already has its content
view set.
public static void assistActivity (Activity activity) {
new AndroidBug5497Workaround(activity);
}
private Activity activity;
private View mChildOfContent;
private int usableHeightPrevious;
private FrameLayout.LayoutParams frameLayoutParams;
private AndroidBug5497Workaround(Activity activity) {
this.activity = activity;
FrameLayout content = (FrameLayout) activity.findViewById(android.R.id.content);
mChildOfContent = content.getChildAt(0);
mChildOfContent.getViewTreeObserver().addOnGlobalLayoutListener(new
ViewTreeObserver.OnGlobalLayoutListener() {
public void onGlobalLayout() {
possiblyResizeChildOfContent();
}
});
frameLayoutParams = (FrameLayout.LayoutParams) mChildOfContent.getLayoutParams();
}
private void possiblyResizeChildOfContent() {
int usableHeightNow = computeUsableHeight();
LogUtils.e("possiblyResizeChildOfContent","usableHeightNow:"+usableHeightNow);
LogUtils.e("possiblyResizeChildOfContent","usableHeightPrevious:"+usableHeightPrevious);
if (usableHeightNow != usableHeightPrevious) {
int usableHeightSansKeyboard = mChildOfContent.getRootView().getHeight();
//这个判断是为了解决19之前的版本不支持沉浸式状态栏导致布局显示不完全的问题
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT){
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
usableHeightSansKeyboard -= statusBarHeight;
}
int heightDifference = usableHeightSansKeyboard - usableHeightNow;
if (heightDifference > (usableHeightSansKeyboard/4)) {
// keyboard probably just became visible
frameLayoutParams.height = usableHeightSansKeyboard - heightDifference;
} else {
// keyboard probably just became hidden
frameLayoutParams.height = usableHeightSansKeyboard;
}
mChildOfContent.requestLayout();
usableHeightPrevious = usableHeightNow;
}
}
private int computeUsableHeight() {
Rect frame = new Rect();
activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
int statusBarHeight = frame.top;
Rect r = new Rect();
mChildOfContent.getWindowVisibleDisplayFrame(r);
//这个判断是为了解决19之后的版本在弹出软键盘时，键盘和推上去的布局（adjustResize）之间有黑色区域
的问题
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
return (r.bottom - r.top)+statusBarHeight;
}
return (r.bottom - r.top);
}
}
