隐藏华为底部操作条

Activity.java

package com.tianbin.youdaowordbookspider;

import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;

public class MainActivity extends AppCompatActivity {

    private int mCurrentApiVersion;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mCurrentApiVersion = Build.VERSION.SDK_INT;

        final int flags = View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_FULLSCREEN
                | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;

        // This work only for android 4.4+
        if (mCurrentApiVersion >= Build.VERSION_CODES.KITKAT) {
            getWindow().getDecorView().setSystemUiVisibility(flags);

            // Code below is to handle presses of Volume up or Volume down.
            // Without this, after pressing volume buttons, the navigation bar will
            // show up and won't hide
            final View decorView = getWindow().getDecorView();
            decorView
                    .setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {

                        @Override
                        public void onSystemUiVisibilityChange(int visibility) {
                            if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
                                decorView.setSystemUiVisibility(flags);
                            }
                        }
                    });
        }

        setContentView(R.layout.activity_main);
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (mCurrentApiVersion >= Build.VERSION_CODES.KITKAT && hasFocus) {
            getWindow().getDecorView().setSystemUiVisibility(
                    View.SYSTEM_UI_FLAG_LAYOUT_STABLE
                            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
                            | View.SYSTEM_UI_FLAG_FULLSCREEN
                            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
        }
    }
}