下面的代码用于在用户每次点击屏幕时切换导航栏的可见性。除了一个场景外，它工作正常--非常快地点击屏幕。在某些情况下，当用户点击非常快时，导航栏会停留在屏幕上，尽管触发了onClick事件。
下面是主活动的代码：
package com.example.ui_test;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.RelativeLayout;
public class MainActivity extends Activity {
private final String DEBUG_TAG = "UI TEST";
int uiOptions = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RelativeLayout r = (RelativeLayout) findViewById(R.id.main_layout);
r.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
toggleUiVisibility();
}
});
View decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
Log.d(DEBUG_TAG, "Visibility changed. New flags: " + Integer.toString(visibility, 2));
uiOptions = visibility;
}
});
}
protected void toggleUiVisibility() {
uiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
getWindow().getDecorView().setSystemUiVisibility(uiOptions);
Log.d(DEBUG_TAG, "Set visibility to: " + Integer.toString(uiOptions, 2));
};}
我尝试了不同的布局（无视图、TextView、全屏ImageView），行为无差异。这是LogCat输出，请查看第6行。setSystemUiVisibility()调用后未记录onSystemUiVisibilityChange事件：
09-21 18:24:19.871: D/UI TEST(3901): Visibility changed. New flags: 0
09-21 18:24:21.139: D/UI TEST(3901): Set visibility to: 10
09-21 18:24:21.171: D/UI TEST(3901): Visibility changed. New flags: 10
09-21 18:24:23.478: D/UI TEST(3901): Visibility changed. New flags: 0
09-21 18:24:24.321: D/UI TEST(3901): Set visibility to: 10
09-21 18:24:25.245: D/UI TEST(3901): Set visibility to: 0
09-21 18:24:25.927: D/UI TEST(3901): Set visibility to: 10
09-21 18:24:25.959: D/UI TEST(3901): Visibility changed. New flags: 10
09-21 18:24:33.625: D/UI TEST(3901): Visibility changed. New flags: 0
09-21 18:24:35.458: D/UI TEST(3901): Set visibility to: 10
09-21 18:24:35.490: D/UI TEST(3901): Visibility changed. New flags: 10
09-21 18:24:36.607: D/UI TEST(3901): Visibility changed. New flags: 0
09-21 18:24:38.294: D/UI TEST(3901): Set visibility to: 10
09-21 18:24:38.326: D/UI TEST(3901): Visibility changed. New flags: 10我使用的Android 5.1.1设备和22目标/最低API级别.
2条答案
按热度按时间tv6aics11#
好吧，事实证明这是一个功能，而不是一个bug。问题是
setSystemUiVisibility连续呼叫之间的间隔，而不是屏幕上的快速点击。我不得不挖掘Android源代码，我发现了这个：这是
PhoneWindowManager.java中的HideNavInputEventReceiver。我也在Xperia Z2上的相册应用程序中重现了这个“bug”。3mpgtkmj2#
在我的情况下，活动可能开始晚了，那么导航栏可能没有隐藏。作为解决方案：
创建时：
关于恢复：
隐藏系统用户界面：
注意：此方法还会隐藏ActionBar。如果要显示它，请将ActionBar内容添加到Activity布局中。