使用 DialogFragment 实现底部菜单

device-2016-09-25-174226.gif

实现

DialogFragment是3.0之后提供的一个弹出框实现类。使用DialogFragment的好处是能够更好的控制其生命周期。

创建一个DialogFragment

public class BottomDialog extends DialogFragment {

    public static BottomDialog newInstance() {

        Bundle args = new Bundle();

        BottomDialog fragment = new BottomDialog();
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onStart() {
        super.onStart();
        Window window = getDialog().getWindow();
        WindowManager.LayoutParams params = window.getAttributes();
        params.gravity = Gravity.BOTTOM;
        params.width = WindowManager.LayoutParams.MATCH_PARENT;
        window.setAttributes(params);
        window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
        View view = inflater.inflate(R.layout.dialog_bottom,container,false);
        AnimationUtils.slideToUp(view);
        return view;
    }


}

对应的layout：

加载自定义布局

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
        View view = inflater.inflate(R.layout.dialog_bottom,container,false);
        AnimationUtils.slideToUp(view);
        return view;
    }

跟使用Fragment一样，重写onCreateView方法。

getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
```的作用是除掉弹出框的标题。

###设置DialogFragment的位置

一把我们的弹出框默认都是居中显示的，现在我们需要的是底部显示，只要把LayoutParams的gravity属性设置为Bottom。

@Override
public void onStart() {
    super.onStart();
    Window window = getDialog().getWindow();
    WindowManager.LayoutParams params = window.getAttributes();
    params.gravity = Gravity.BOTTOM;
    params.width = WindowManager.LayoutParams.MATCH_PARENT;
    window.setAttributes(params);
    window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
}

###加载动画AnimationUtils.slideToUp(view);

public static void slideToUp(View view){
Animation slide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
1.0f, Animation.RELATIVE_TO_SELF, 0.0f);

    slide.setDuration(400);
    slide.setFillAfter(true);
    slide.setFillEnabled(true);
    view.startAnimation(slide);

    slide.setAnimationListener(new Animation.AnimationListener() {
        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationEnd(Animation animation) {

        }

        @Override
        public void onAnimationRepeat(Animation animation) {

        }
    });

}

```

源码地址：BottomMenuTutorial