在Android上为了实现全屏显示，透明状态栏，沉浸模式等效果，往往需要我们掌握和系统UI显示隐藏相关的各种Flag。Android上API版本混乱，各种Flag林立。今天我们就来聊聊这些Flags。

在Android Kitkat中引入Immersive Mode

imm-states.png

透明状态栏

style_color_colorscheme_palette1_example.png

if (Build.VERSION.SDK_INT >= 21) {    View decorView = getWindow().getDecorView();    int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN            | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;    decorView.setSystemUiVisibility(option);    getWindow().setStatusBarColor(Color.TRANSPARENT); //也可以设置成灰色透明的，比较符合Material Design的风格}

全屏显示

View decorView = getWindow().getDecorView();int option = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION        | View.SYSTEM_UI_FLAG_FULLSCREEN;decorView.setSystemUiVisibility(option);

沉浸模式(普通Immersive Mode)

imm-states.png

 @Override    public void onWindowFocusChanged(boolean hasFocus) {        super.onWindowFocusChanged(hasFocus);        if (hasFocus && Build.VERSION.SDK_INT >= 19) {            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);        }    }

沉浸模式（通过点击内容区域控制System UI的显示和隐藏）

import android.os.Handler;import android.os.Message;import android.support.v7.app.ActionBar;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.GestureDetector;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;public class MainActivity extends AppCompatActivity {    private static final int INITIAL_DELAY = 1500;    private View mDecorView;    private ActionBar mActionBar;    private View mContentView;    private Handler handler = new Handler(){        @Override        public void handleMessage(Message msg) {            hideSystemUI();        }    };    private GestureDetector gestureDetector = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener(){        @Override        public boolean onSingleTapUp(MotionEvent e) {            if ((mDecorView.getSystemUiVisibility() & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0){                hideSystemUI();            }else {                showSystemUI();            }            return true;        }    });    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        mDecorView = getWindow().getDecorView();        mContentView = LayoutInflater.from(this).inflate(R.layout.activity_immersive, null);        setContentView(mContentView);        mDecorView.setOnSystemUiVisibilityChangeListener(new View.OnSystemUiVisibilityChangeListener() {            @Override            public void onSystemUiVisibilityChange(int visibility) {                if ((visibility & View.SYSTEM_UI_FLAG_HIDE_NAVIGATION) == 0){                    //systemUI is visible                    mActionBar.show();                }else {                    //systemUI is invisible                    mActionBar.hide();                }            }        });        mContentView.setOnTouchListener(new View.OnTouchListener() {            @Override            public boolean onTouch(View v, MotionEvent event) {                gestureDetector.onTouchEvent(event);                return true;            }        });        mActionBar = getSupportActionBar();        mActionBar.setShowHideAnimationEnabled(true);        showSystemUI();    }    @Override    public void onWindowFocusChanged(boolean hasFocus) {        super.onWindowFocusChanged(hasFocus);        if (hasFocus){            delayedHide(INITIAL_DELAY);        }else {            handler.removeMessages(0);            showSystemUI();        }    }    private void delayedHide(int delay){        handler.removeMessages(0);        handler.sendEmptyMessageDelayed(0, delay);    }    private void hideSystemUI(){        mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE                                        |View.SYSTEM_UI_FLAG_HIDE_NAVIGATION                                        |View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION                                        |View.SYSTEM_UI_FLAG_FULLSCREEN                                        |View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN                                        |View.SYSTEM_UI_FLAG_IMMERSIVE);    }    private void showSystemUI(){        mDecorView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE        |View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION        |View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);    }}

玩转Android上透明状态栏，全屏显示以及沉浸模式（Immersive Mode）

相关API

相关Flag

参考Reference

使用场景

透明状态栏

全屏显示

沉浸模式(普通Immersive Mode)

沉浸模式（通过点击内容区域控制System UI的显示和隐藏）

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