android隐藏系统底部虚拟栏

华为手机的返回，home和菜单键，都是采用的底部虚拟键的方式，有时候，碰到一些特殊的需求，需要隐藏和显示这些虚拟栏

效果图：

2.主界面调用

package com.example.admin.ztest; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_save, btn_get, btn_clear, btn_all,btn_show,btn_hide; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_first); btn_show = findViewById(R.id.btn_show); btn_hide = findViewById(R.id.btn_hide); btn_show.setOnClickListener(this); btn_hide.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.btn_show: DisplayUtil.showNavBar(MainActivity.this); break; case R.id.btn_hide: DisplayUtil.hideNavBar(MainActivity.this); break; } } }

3.隐藏和显示虚拟栏的类：

package com.example.admin.ztest; /** * Created by wrs on 2019/5/23,17:41 * projectName: Ztest5 * packageName: com.example.admin.ztest */ /** * Created by sisilai on 15/11/7. */ import android.app.Activity; import android.content.Context; import android.content.res.Resources; import android.graphics.Rect; import android.os.Build; import android.util.DisplayMetrics; import android.util.TypedValue; import android.view.View; import android.view.Window; import android.view.WindowManager; import android.widget.Toast; import java.lang.reflect.Method; public class DisplayUtil { public static int getScreenSizeWidth(Activity con) { DisplayMetrics metric = new DisplayMetrics(); con.getWindowManager().getDefaultDisplay().getMetrics(metric); int width = metric.widthPixels; // 屏幕宽度（像素） return width; } public static int getScreenSizeHeight(Activity con) { DisplayMetrics metric = new DisplayMetrics(); con.getWindowManager().getDefaultDisplay().getMetrics(metric); int heightPixels = metric.heightPixels; // 屏幕宽度（像素） return heightPixels; } public static int dip2px(Context context, float dipValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (dipValue * scale + 0.5f); } public static int px2dip(Context context, float pxValue) { final float scale = context.getResources().getDisplayMetrics().density; return (int) (pxValue / scale + 0.5f); } public static int dp2px(Context context, int dp) { return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, context.getResources().getDisplayMetrics()); } public static int getStatusBarHeight(Context context) { int result = 0; int resourceId = context.getResources().getIdentifier("status_bar_height", "dimen", "android"); if (resourceId > 0) { result = context.getResources().getDimensionPixelSize(resourceId); } return result; } /** * 获取状态栏高度 * * @param v * @return */ public static int getStatusBarHeight(View v) { if (v == null) { return 0; } Rect frame = new Rect(); v.getWindowVisibleDisplayFrame(frame); return frame.top; } /** * 隐藏底部虚拟栏 * * @param activity */ public static void hideNavBar(Activity activity) { if (!hasNavigationBar(activity)) { return; } if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { View v = activity.getWindow().getDecorView(); v.setSystemUiVisibility(View.GONE); } else if (Build.VERSION.SDK_INT >= 19) { View decorView = activity.getWindow().getDecorView(); int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY | View.SYSTEM_UI_FLAG_FULLSCREEN; decorView.setSystemUiVisibility(uiOptions); } } /** * 显示底部虚拟栏 * * @param activity */ public static void showNavBar(Activity activity) { if (!hasNavigationBar(activity)) { return; } if (Build.VERSION.SDK_INT > 11 && Build.VERSION.SDK_INT < 19) { //低版本sdk View v = activity.getWindow().getDecorView(); v.setSystemUiVisibility(View.VISIBLE); } else if (Build.VERSION.SDK_INT >= 19) { View decorView = activity.getWindow().getDecorView(); int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN; decorView.setSystemUiVisibility(uiOptions); } } /** * 隐藏迈冲android系统底部虚拟栏 * * @param context * @return */ public static boolean hideMCNavBar(Context context) { if (!hasNavigationBar(context)) { return true; } boolean ishide; try { String command; command = "LD_LIBRARY_PATH=/vendor/lib:/system/lib service call activity 42 s16 com.android.systemui"; Process proc = Runtime.getRuntime().exec(new String[]{"su", "-c", command}); proc.waitFor(); ishide = true; } catch (Exception ex) { Toast.makeText(context.getApplicationContext(), ex.getMessage(), Toast.LENGTH_LONG).show(); ishide = false; } return ishide; } /** * 显示迈冲android系统底部虚拟栏 * * @return */ public static boolean showMCNavBar(Context context) { if (!hasNavigationBar(context)) { return true; } boolean isshow; try { String command; command = "LD_LIBRARY_PATH=/vendor/lib:/system/lib am startservice -n com.android.systemui/.SystemUIService"; Process proc = Runtime.getRuntime().exec(new String[]{"su", "-c", command}); proc.waitFor(); isshow = true; } catch (Exception e) { isshow = false; e.printStackTrace(); } return isshow; } /** * 判断是否存在虚拟按键 * * @return */ public static boolean hasNavigationBar(Context context) { boolean hasNavigationBar = false; Resources rs = context.getResources(); int id = rs.getIdentifier("config_showNavigationBar", "bool", "android"); if (id > 0) { hasNavigationBar = rs.getBoolean(id); } try { Class<?> systemPropertiesClass = Class.forName("android.os.SystemProperties"); Method m = systemPropertiesClass.getMethod("get", String.class); String navBarOverride = (String) m.invoke(systemPropertiesClass, "qemu.hw.mainkeys"); if ("1".equals(navBarOverride)) { hasNavigationBar = false; } else if ("0".equals(navBarOverride)) { hasNavigationBar = true; } } catch (Exception e) { } return hasNavigationBar; } }