Android开发第七天（续）

Damon——弹出菜单

coverEyelogin

基本布局（activity_main.xml）

控件样式

主要实现（MainActivity.java）

public class MainActivity extends AppCompatActivity {
    private int[] resid = {R.id.b, R.id.c, R.id.d, R.id.e, R.id.f, R.id.g};
    private boolean isopen = false;

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

    private void initView() {
        //给菜单按钮添加点击事件
        ImageButton menu = findViewById(R.id.a);
        menu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //遍历数组 取出每一个按钮
                for (int i = 0; i < resid.length; i++) {
                    //判断是打开 还是关闭
                    if (isopen == true) {
                        //之前是打开 现在需要关闭
                        close(i);
                    } else {
                        //之前是关闭的 现在需要打开
                        open(i);
                    }
                }
                isopen = !isopen;
            }
        });
    }

    public void open(int i) {
        animate(i, true);
    }

    public void close(int i) {
        animate(i, false);
    }

    public void animate(int i, boolean state) {
        //计算平分之后的两个之间的角度
        double angle = (Math.PI / (resid.length + 1));

        //获取id对应控件
        ImageButton ib = findViewById(resid[i]);

        //计算当前控件对应的角度
        double mAngle = (i + 1) * angle;

        //计算x距离
        float x = (float) (Math.cos(mAngle) * 400);
        //计算y距离
        float y = (float) (Math.sin(mAngle) * 400);

        float startx;
        float tox;
        float starty;
        float toy;
        Interpolator interpolator;
        if (state == true) {
            startx = 0;
            starty = 0;
            tox = x;
            toy = -y;
            interpolator = new BounceInterpolator();
        } else {
            startx = x;
            starty = -y;
            tox = 0;
            toy = 0;
            interpolator = new AnticipateInterpolator();
        }

        //移动的动画
        TranslateAnimation tAnim = new TranslateAnimation(
                startx, tox, starty, toy);
        tAnim.setDuration(500);
        tAnim.setInterpolator(interpolator);

        //旋转动画
        RotateAnimation rAnim = new RotateAnimation(0, 360 * 3,
                Animation.RELATIVE_TO_SELF, 0.5f,
                Animation.RELATIVE_TO_SELF, 0.5f);
        rAnim.setDuration(500);

        //创建一个AnimationSet集合 包裹多个动画
        AnimationSet set = new AnimationSet(false);
        set.setFillAfter(true);
        set.addAnimation(rAnim);
        set.addAnimation(tAnim);

        //开始动画
        ib.startAnimation(set);
    }
}