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This is an example of using DropDownMenu in actual operation,you can learn how to use custom view or fragment in DropDownMenu,and also can learn how to reuse the view or fragment.

Java 100.00%

dropdownmenu's Introduction

DropDownMenu

This is an example of using DropDownMenu in actual operation,you can learn how to use custom view or fragment in DropDownMenu,and also can learn how to reuse the view or fragment.

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DropDownMenu介绍与使用


这个项目是对开源项目DropDownMenu的在实际项目中的应用。在这个项目中,实现了用自定义view和fragment两种方式完成了对DropDownMenu的使用,一个view独立成一个类,通过接口的方式供Activity调用,同时解决了复用自定义view的问题。通过这个项目,可以能够很清楚地搭建一个下拉筛选框,不仅能供多个Activity使用同一个view,而且还大大减少了Activity中的代码量。
DropDownMenu在github上的地址:

https://github.com/fg2q1q3q/DropDownMenu


项目使用

Gradle


在project 中build.gradle下增加:

  allprojects {
        repositories {
            ...
            maven { url "https://jitpack.io" }
        }
    }

在app module中增加:

  dependencies {
            compile 'com.github.fg2q1q3q:DropDownMenu:1.1.1'
    }

layout


<com.zxl.library.DropDownMenu
    android:id="@+id/dropDownMenu"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:ddmenuTextSize="13sp" //tab字体大小
    app:ddtextUnselectedColor="@color/drop_down_unselected" //tab未选中颜色
    app:ddtextSelectedColor="@color/drop_down_selected" //tab选中颜色
    app:ddmenuSelectedIcon="@mipmap/drop_down_selected_icon" //tab选中状态图标
    app:ddmenuUnselectedIcon="@mipmap/drop_down_unselected_icon"//tab未选中状态图标
    app:ddmaskColor="@color/mask_color"     //遮罩颜色,一般是半透明
    app:ddmenuBackgroundColor="@color/white" //tab 背景颜色
    app:ddmenuMaxHeight="280dp"//筛选菜单最大高度,默认为wrap
    app:ddneedSetSlectedColor="true"//设置选中option后tab是否改变颜色
    ...
 />

注意:DropDownMenu高度必须是match_parent,否则动画效果会出现问题

Activity中,除了下拉筛选框之外,还有它的主体内容,一般情况下是个列表;这里需要说明的是,主体内容的控件不是写在DropDownMenu的下方,而是通过view的形式,设置给DropDownMenu。
所以,新建一个xml,名字为activity_main_view,里面就放了个TextView,用来显示筛选框选中的文字,代码如下:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical"
    android:layout_gravity="center"
    >

    <TextView
        android:id="@+id/tv_text"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="哈哈哈哈哈哈哈哈哈哈"
        android:gravity="center"
        />


</LinearLayout>


从预览图可以看出,筛选框里面有四个界面,前两个界面是用实例化xml的方式来实现界面内容的自定义,后两个界面用Fragment的方式实现的;前两个界面的实现方式是一样的,后两个界面实现了给Fragment传参从而显示不同的内容。
**第一个界面的xml,layout_first,界面只有两个按钮,实现点击改变Activity中文本框的文本;代码如下:**
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="horizontal"
    android:layout_gravity="center"
    >

    <TextView
        android:id="@+id/btn_one"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@color/colorPrimary"
        android:gravity="center"
        android:padding="8dp"
        android:text="第一个"
        android:textColor="@color/white"
        android:textSize="16sp" />
    <TextView
        android:id="@+id/btn_two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:background="@drawable/ok_bg"
        android:gravity="center"
        android:padding="8dp"
        android:text="第二个"
        android:textColor="@color/white"
        android:textSize="16sp" />

</LinearLayout>


**新建一个类,名字叫做`FirstView.class`,实例化xml,并对相应的控件做相应的操作,代码如下:**
class FirstView {

    private Context context;
    private MyItemClickListener listener;

    FirstView(Context context) {
        this.context = context;
    }

    /**
    *  供Activity调用的方法 ,将选择的值传给Activity
    * */
    void setListener(MyItemClickListener listener) {
        this.listener = listener;
    }

    View firstView() {
        View view = LayoutInflater.from(context).inflate(R.layout.layout_first, null);
        TextView tvBtnOne = (TextView) view.findViewById(R.id.btn_one);
        TextView tvBtnTwo = (TextView) view.findViewById(R.id.btn_two);
        tvBtnOne.setOnClickListener(new mClick("第一个"));
        tvBtnTwo.setOnClickListener(new mClick("第二个"));
        return view;
    }

    private class mClick implements View.OnClickListener {

        String string;

        private mClick(String string) {
            this.string = string;
        }

        @Override
        public void onClick(View v) {
            listener.onItemClick(v, 1, string);
        }
    }

}

**然后,新建一个Fragment,`ThirdView.class`,xml中是三个文本框,Fragment的代码如下:**
public class ThirdView extends Fragment {

    @InjectView(R.id.tv_01)
    TextView tv01;
    @InjectView(R.id.tv_02)
    TextView tv02;
    @InjectView(R.id.tv_03)
    TextView tv03;

    MyItemClickListener listener;

    public void setListener(MyItemClickListener listener) {
        this.listener = listener;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_third_view, container, false);
        ButterKnife.inject(this, view);
        return view;
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        ButterKnife.reset(this);
    }
   /**
    * 通过这个方法,可以实现Fragment的复用
    * */
    public void setDifferentUse(String tag){
        switch (tag){
            case "four":
                tv01.setText("复用界面的第一个文本");
                tv02.setText("复用界面的第二个文本");
                tv03.setText("复用界面的第三个文本");
                break;
            default:
                break;
        }
    }

    @OnClick({R.id.tv_01, R.id.tv_02, R.id.tv_03})
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.tv_01:
                listener.onItemClick(view,3,"tvOne");
                break;
            case R.id.tv_02:
                listener.onItemClick(view,3,"tvTwo");
                break;
            case R.id.tv_03:
                listener.onItemClick(view,3,"tvThree");
                break;
        }
    }
}

**然后在xml中引用Fragment,新建xml,名字为`layout_third.xml`,代码如下:**
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fg_third"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="com.hebin.dropdownmenu.ThirdView"
    tools:layout="@layout/fragment_third_view" />

最后在Activity中,new 各个界面,然后设置给DropDownMenu,即可实现效果,代码如下:

public class MainActivity extends AppCompatActivity implements MyItemClickListener {

    @InjectView(R.id.dropDownMenu)
    DropDownMenu mDropDownMenu;


    private String headers[] = {"界面一", "界面二","界面三","界面四"};
    private List<View> popupViews = new ArrayList<>();
    private TextView tvText;

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

    private void initView() {

        /**
         * 第一个界面
        * */
        FirstView firstView = new FirstView(MainActivity.this);
        firstView.setListener(this);
        popupViews.add(firstView.firstView());
        /**
        * 第二个界面
        * */
        SecView secView = new SecView(MainActivity.this);
        secView.setListener(this);
        popupViews.add(secView.secView());
        /**
        * 第三个界面
        * */
        View thirdView = LayoutInflater.from(MainActivity.this).inflate(R.layout.layout_third, null);
        ThirdView fragment = (ThirdView) getSupportFragmentManager().findFragmentById(R.id.fg_third);
        fragment.setListener(this);
        fragment.setDifferentUse("third");
        popupViews.add(thirdView);
        /**
        * 第四个界面
        * */
        View fourView = LayoutInflater.from(MainActivity.this).inflate(R.layout.layout_four, null);
        ThirdView fragment_01 = (ThirdView) getSupportFragmentManager().findFragmentById(R.id.fg_four);
        fragment_01.setListener(this);
        fragment_01.setDifferentUse("four");
        popupViews.add(fourView);

        /**
        * Dropdownmenu下面的主体部分
        * */
        View fifthView = LayoutInflater.from(MainActivity.this).inflate(R.layout.activity_main_view, null);
        tvText = (TextView) fifthView.findViewById(R.id.tv_text);
        mDropDownMenu.setDropDownMenu(Arrays.asList(headers), popupViews, fifthView);
    }

    @Override
    public void onBackPressed() {
        //退出activity前关闭菜单
        if (mDropDownMenu.isShowing()) {
            mDropDownMenu.closeMenu();
        } else {
            super.onBackPressed();
        }
    }


    /**
    * 每个界面中的控件的点击事件,点击将界面中的参数传给activity中调用
    * */
    @Override
    public void onItemClick(View view, int postion, String string) {
        switch (postion){
            case 1:
                mDropDownMenu.setTabText(string);
                mDropDownMenu.closeMenu();
                tvText.setText(string);
                break;
            case 2:
                mDropDownMenu.setTabText(string);
                mDropDownMenu.closeMenu();
                tvText.setText(string);
                break;
            case 3:
                mDropDownMenu.setTabText(string);
                mDropDownMenu.closeMenu();
                tvText.setText(string);
                break;
            default:
                break;
        }
    }
}

注意:第四个界面用的也是第三个界面的Fragment,但是不能用layout_third.xml这个布局,也不能用同一个id,所以新建一个layout_four.xml,里面内容跟layout_third.xml的一样,只不过换了个ID

License

Copyright 2015-2019 dinus

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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