Android 动态菜单实现实例代码

 /**   * Item开启动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private void btnItemStartAnimator(View btnItem, int index, int total, int radius) {    if (btnItem.getVisibility() != View.VISIBLE) {      btnItem.setVisibility(View.VISIBLE);    }    double degree = Math.toRadians(90) / (total - 1) * index;//Math中根据度数得到弧度值的函数    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //实现平移缩放和透明动画    set.playTogether(        ObjectAnimator.ofFloat(btnItem, "translationX", 0, translationX),        ObjectAnimator.ofFloat(btnItem, "translationY", 0, translationY),        ObjectAnimator.ofFloat(btnItem, "scaleX", 0, 1),        ObjectAnimator.ofFloat(btnItem, "scaleY", 0, 1),        ObjectAnimator.ofFloat(btnItem, "alpha", 0, 1)    );    set.setInterpolator(new BounceInterpolator());    set.setDuration(500).start();  }  /**   * Item关闭动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private void btnItemCloseAnimator(View btnItem, int index, int total, int radius) {    double degree = Math.PI * index / ((total - 1) * 2);    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //包含平移、缩放和透明度动画    set.playTogether(        ObjectAnimator.ofFloat(btnItem, "translationX", translationX, 0),        ObjectAnimator.ofFloat(btnItem, "translationY", translationY, 0),        ObjectAnimator.ofFloat(btnItem, "scaleX", 1f, 0f),        ObjectAnimator.ofFloat(btnItem, "scaleY", 1f, 0f),        ObjectAnimator.ofFloat(btnItem, "alpha", 1f, 0f));    set.setDuration(500).start();    if (btnItem.getVisibility() == View.VISIBLE) {      btnItem.setVisibility(View.INVISIBLE);    }  }

ObjectAnimator.ofFloat(btnItem, "translationX", 0, translationX),    ObjectAnimator.ofFloat(btnItem, "translationY", 0, translationY),

 double degree = Math.toRadians(90) / (total - 1) * index;//Math中根据度数得到弧度值的函数    int translationX = -(int) (radius * Math.sin(degree));

 double degree = Math.PI * index / ((total - 1) * 2);     int translationX = -(int) (radius * Math.sin(degree));

package xsf.customView;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.view.View;import android.view.animation.BounceInterpolator;import android.widget.Button;import android.widget.Toast;import xsf.customView.base.BaseActvity;public class StatelliteActivity extends BaseActvity {  private Button btnMenu, btnItem1, btnItem2, btnItem3, btnItem4, btnItem5;  private boolean isMenuOpen = false;  @Override  protected int setLayoutResourceId() {    return R.layout.activity_statellite;  }  @Override  protected void initView() {    btnMenu = (Button) findViewById(R.id.btnMenu);    btnMenu.setOnClickListener(this);    btnItem1 = (Button) findViewById(R.id.btnItem1);    btnItem1.setOnClickListener(this);    btnItem2 = (Button) findViewById(R.id.btnItem2);    btnItem2.setOnClickListener(this);    btnItem3 = (Button) findViewById(R.id.btnItem3);    btnItem3.setOnClickListener(this);    btnItem4 = (Button) findViewById(R.id.btnItem4);    btnItem4.setOnClickListener(this);    btnItem5 = (Button) findViewById(R.id.btnItem5);    btnItem5.setOnClickListener(this);  }    @Override  public void onClick(View v) {    btnMenu.requestFocus();    switch (v.getId()) {      case R.id.btnMenu:        showItemAnimator();        break;      case R.id.btnItem1:        Toast.makeText(StatelliteActivity.this, "点击了Item1", Toast.LENGTH_SHORT).show();        break;      case R.id.btnItem2:        Toast.makeText(StatelliteActivity.this, "点击了Item2", Toast.LENGTH_SHORT).show();        break;      case R.id.btnItem3:        Toast.makeText(StatelliteActivity.this, "点击了Item3", Toast.LENGTH_SHORT).show();        break;      case R.id.btnItem4:        Toast.makeText(StatelliteActivity.this, "点击了Item4", Toast.LENGTH_SHORT).show();        break;      case R.id.btnItem5:        Toast.makeText(StatelliteActivity.this, "点击了Item5", Toast.LENGTH_SHORT).show();        break;    }  }  private void showItemAnimator() {    if (!isMenuOpen) {      //此时menu是关闭的      isMenuOpen = true;      btnItemStartAnimator(btnItem1, 0, 5, 300);      btnItemStartAnimator(btnItem2, 1, 5, 300);      btnItemStartAnimator(btnItem3, 2, 5, 300);      btnItemStartAnimator(btnItem4, 3, 5, 300);      btnItemStartAnimator(btnItem5, 4, 5, 300);    } else {      //此时menu是打开的      isMenuOpen = false;      btnItemCloseAnimator(btnItem1, 0, 5, 300);      btnItemCloseAnimator(btnItem2, 1, 5, 300);      btnItemCloseAnimator(btnItem3, 2, 5, 300);      btnItemCloseAnimator(btnItem4, 3, 5, 300);      btnItemCloseAnimator(btnItem5, 4, 5, 300);    }  }  /**   * 关闭动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private void btnItemCloseAnimator(View btnItem, int index, int total, int radius) {    double degree = Math.PI * index / ((total - 1) * 2);    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //包含平移、缩放和透明度动画    set.playTogether(        ObjectAnimator.ofFloat(btnItem, "translationX", translationX, 0),        ObjectAnimator.ofFloat(btnItem, "translationY", translationY, 0),        ObjectAnimator.ofFloat(btnItem, "scaleX", 1f, 0f),        ObjectAnimator.ofFloat(btnItem, "scaleY", 1f, 0f),        ObjectAnimator.ofFloat(btnItem, "alpha", 1f, 0f));    set.setDuration(500).start();    if (btnItem.getVisibility() == View.VISIBLE) {      btnItem.setVisibility(View.INVISIBLE);    }  }  /**   * 开启动画   *   * @param btnItem   * @param index   * @param total   * @param radius   */  private void btnItemStartAnimator(View btnItem, int index, int total, int radius) {    if (btnItem.getVisibility() != View.VISIBLE) {      btnItem.setVisibility(View.VISIBLE);    }    double degree = Math.toRadians(90) / (total - 1) * index;//Math中根据度数得到弧度值的函数    int translationX = -(int) (radius * Math.sin(degree));    int translationY = -(int) (radius * Math.cos(degree));    AnimatorSet set = new AnimatorSet();    //实现平移缩放和透明动画    set.playTogether(        ObjectAnimator.ofFloat(btnItem, "translationX", 0, translationX),        ObjectAnimator.ofFloat(btnItem, "translationY", 0, translationY),        ObjectAnimator.ofFloat(btnItem, "scaleX", 0, 1),        ObjectAnimator.ofFloat(btnItem, "scaleY", 0, 1),        ObjectAnimator.ofFloat(btnItem, "alpha", 0, 1)    );    set.setInterpolator(new BounceInterpolator());    set.setDuration(500).start();  }}