1.全局变量

//屏幕适配
    private DisplayMetrics displayMetrics;
    private int window_width;
    private int window_height;

2.

    @Override
    public void setRootView() {
        setContentView(R.layout.activity_tender);

        //屏幕适配
        displayMetrics = new DisplayMetrics();
    getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
    window_height = displayMetrics.heightPixels;
    window_width = displayMetrics.widthPixels;
        
    }