Android应用开发（38）全屏显示隐藏标题栏、状态栏和导航栏

Android应用开发学习笔记——目录索引

一、隐藏标题栏

1. setContentView()之前，加入

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        /* 隐藏标题栏 */
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

2.  在onCreate()方法中使用

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /* 隐藏标题栏 */
        getSupportActionBar().hide();
    }

二、隐藏状态栏和导航栏

直接在onCreate中调用

getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);

能隐藏 状态栏，但是依旧有状态栏黑边

使用如下方法可以彻底全屏显示

1. super.onCreate和setContentView()之前，加入如下代码：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        /* 在super.onCreate()之前添加代码块 start */
        /* 隐藏标题栏 */
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        /* 隐藏状态栏 */
       supportRequestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

        WindowManager.LayoutParams lp = getWindow().getAttributes();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            lp.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
        }
        getWindow().setAttributes(lp);
        /* 在super.onCreate()之前添加代码块 end */

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

  2. 添加实现函数onWindowFocusChanged函数

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    /* 添加函数onWindowFocusChanged */
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            View decorView = getWindow().getDecorView();
            decorView.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);
        }
    }

完整代码如下：

package com.example.fullscreentest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        /* 在super.onCreate()之前添加代码块 start */
        /* 隐藏标题栏 */
        supportRequestWindowFeature(Window.FEATURE_NO_TITLE);
        /* 隐藏状态栏 */
        supportRequestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

        WindowManager.LayoutParams lp = getWindow().getAttributes();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            lp.layoutInDisplayCutoutMode = WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES;
        }
        getWindow().setAttributes(lp);
        /* 在super.onCreate()之前添加代码块 end */

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    /* 添加函数onWindowFocusChanged */
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus) {
            View decorView = getWindow().getDecorView();
            decorView.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);
        }
    }
}

点此查看Android应用开发学习笔记的完整目录