虚拟导航键显示隐藏监听及自动设定高度
问题描述
某些型号在某些布局下使用虚拟导航栏不能自动调整布局，导致遮挡。特别是华为手机。。。
问题解决步骤
- 获取根布局
- 设置
ViewTree 的全局界面监听
- 当捕获到界面更新时，去判断虚拟导航键是否弹出或隐藏然后做出相应的操作
实现
1. 获取根布局
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
| public class MainActivity implements ViewTreeObserver.OnGlobalLayoutListener{
FrameLayout content;
private boolean mLayoutComplete = false;
...
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
content = (FrameLayout) findViewById(android.R.id.content);
}
@Override
public void onGlobalLayout() {
...
}
...
}
|
2. 设置监听
1
2
3
4
5
6
7
8
9
10
11
12
13
| @Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
content = (FrameLayout) findViewById(android.R.id.content);
content.post(new Runnable() {
@Override
public void run() {
mLayoutComplete = true;
LogUtils.d("content 布局完成");
}
});
content.getViewTreeObserver().addOnGlobalLayoutListener(this);
}
|
3. 捕获监听事件并做出虚拟导航是否隐藏的相应操作
捕获监听
1
2
3
4
5
6
| @Override
public void onGlobalLayout() {
LogUtils.d("onGlobalLayout");
if (!mLayoutComplete) return;
onNavigationBarStatusChanged();
}
|
虚拟导航是否隐藏的相应操作
在这里我判断虚拟导航键是否弹出的依据是 当前屏幕真实高度 是否大于 屏幕高度 。
1
2
3
4
5
6
7
8
9
| protected void onNavigationBarStatusChanged() {
if (ScreenUtils.getRealHeight() > ScreenUtils.getHeight()) {
getWindow().getDecorView().findViewById(android.R.id.content).setPadding(0, 0, 0,ScreenUtils.getNavigationBarHeight(this));
getWindow().setNavigationBarColor(Color.parseColor("#000000"));
} else {
getWindow().getDecorView().findViewById(android.R.id.content).setPadding(0, 0, 0, 0);
}
}
|
4.其他方法
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
| public class ScreenUtils {
public static int getNavigationBarHeight(Context context){
int result = 0;
int resourceId = context.getResources().getIdentifier("navigation_bar_height","dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public static int getHeight() {
DisplayMetrics dm = new DisplayMetrics();
WindowManager windowManager = (WindowManager) BaseApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(dm);
return dm.heightPixels;
}
public static int getRealHeight() {
WindowManager windowManager = (WindowManager) BaseApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
display.getRealMetrics(dm);
} else {
display.getMetrics(dm);
}
int realHeight = dm.heightPixels;
return realHeight;
}
}
|
总结
以下为封装代码
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
public class ScreenUtils {
public static int getNavigationBarHeight(Context context) {
int result = 0;
int resourceId = context.getResources().getIdentifier("navigation_bar_height", "dimen", "android");
if (resourceId > 0) {
result = context.getResources().getDimensionPixelSize(resourceId);
}
return result;
}
public static int getHeight() {
DisplayMetrics dm = new DisplayMetrics();
WindowManager windowManager = (WindowManager) BaseApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
windowManager.getDefaultDisplay().getMetrics(dm);
return dm.heightPixels;
}
public static int getRealHeight() {
WindowManager windowManager = (WindowManager) BaseApplication.getInstance().getSystemService(Context.WINDOW_SERVICE);
Display display = windowManager.getDefaultDisplay();
DisplayMetrics dm = new DisplayMetrics();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
display.getRealMetrics(dm);
} else {
display.getMetrics(dm);
}
int realHeight = dm.heightPixels;
return realHeight;
}
public interface NavigationListener {
void show();
void hide();
}
public static void setNavigationListener(final View rootView, final NavigationListener navigationListener) {
if (rootView == null || navigationListener == null) {
return;
}
rootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
if (ScreenUtils.getRealHeight() > ScreenUtils.getHeight()) {
if (navigationListener != null) {
navigationListener.show();
}
} else {
if (navigationListener != null) {
navigationListener.hide();
}
}
}
});
}
}
|
注： 在使用 setNavigationListener 时，传入的 rootView 为对应的 android.R.id.content 布局（FrameLayout 类型），传入别的可能没有效果。在这里我判断虚拟导航键是否弹出的依据是 当前屏幕真实高度 是否大于 屏幕高度 。
之后在使用时只需要对出现虚拟导航栏出现覆盖问题的 Activity 添加对 rootView 的监听，即可方便的实现虚拟导航栏隐藏与显示的监听。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
| @Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
content = (FrameLayout) findViewById(android.R.id.content);
ScreenUtils.setNavigationListener(content, new ScreenUtils.NavigationListener() {
@Override
public void show() {
}
@Override
public void hide() {
}
});
}
|
