Android 部分机型没有物理按键，只有虚拟按键，Activity全屏方法如下：

  1. 在

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    setContentView(R.layout.activity_main);

    之前添加

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

  2. 当用户划出虚拟按键后，自动再隐藏方法如下：

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    getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
    int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
            //布局位于状态栏下方
            View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
            //全屏
            View.SYSTEM_UI_FLAG_FULLSCREEN |
            //隐藏导航栏
            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    if (Build.VERSION.SDK_INT >= 19) {
        uiOptions |= 0x00001000;
    } else {
        uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
    }
    getWindow().getDecorView().setSystemUiVisibility(uiOptions);
}
});

  3. dialog 隐藏方法

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    mDialog.getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
mDialog.getWindow().getDecorView().setOnSystemUiVisibilityChangeListener(new OnSystemUiVisibilityChangeListener() {
@Override
public void onSystemUiVisibilityChange(int visibility) {
    int uiOptions = View.SYSTEM_UI_FLAG_LAYOUT_STABLE |
            //布局位于状态栏下方
            View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
            //全屏
            View.SYSTEM_UI_FLAG_FULLSCREEN |
            //隐藏导航栏
            View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
            View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN;
    if (Build.VERSION.SDK_INT >= 19) {
        uiOptions |= 0x00001000;
    } else {
        uiOptions |= View.SYSTEM_UI_FLAG_LOW_PROFILE;
    }
    mDialog.getWindow().getDecorView().setSystemUiVisibility(uiOptions);
}
});

    要在mDialog.show();之前。

  4. dialog 隐藏方法,放在自定义dialog中即可

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    @Override
public void onStart() {
super.onStart();
Window window = this.getWindow();
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    //如果是在activity中则用这段代码
    //Window window = getDialog().getWindow();
    window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
    	    WindowManager.LayoutParams.FLAG_FULLSCREEN);
    // 用在activity中，去标题
    //window.requestWindowFeature(Window.FEATURE_NO_TITLE);
    int uiOptions =View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
    	|View.SYSTEM_UI_FLAG_LAYOUT_STABLE
    	|View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
    	|View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
    	|View.SYSTEM_UI_FLAG_IMMERSIVE
    	|View.SYSTEM_UI_FLAG_FULLSCREEN

    window.getDecorView().setSystemUiVisibility(uiOptions);
    }