沉浸式开发

//沉浸式状态栏 (状态栏需要显示,但是不占位)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        Window window = getWindow();
        View decorView = window.getDecorView();
        int option = View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE;
        decorView.setSystemUiVisibility(option);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
            window.setStatusBarColor(Color.TRANSPARENT);
        }
        setContentView(R.layout.activity_main);
    }

/**
 * Created by malei on 2020-06-30
 * Describe：
 */
public class StatusBarView extends View {
    private static int mStatusBarHeight;

    public StatusBarView(Context context) {
        this(context, null);
    }

    public StatusBarView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            mStatusBarHeight = getStatusBarHeight(context);
        }
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec), mStatusBarHeight);
    }

    //此处代码可以放到StatusBarUtils
    public static int getStatusBarHeight(Context context) {
        if (mStatusBarHeight == 0) {
            Resources res = context.getResources();
            int resourceId = res.getIdentifier("status_bar_height", "dimen", "android");
            if (resourceId > 0) {
                mStatusBarHeight = res.getDimensionPixelSize(resourceId);
            }
        }
        return mStatusBarHeight;
    }
}