Android仿微信下拉列表實現

         本文要實現微信6.1中點擊頂部菜單欄的“+”號按鈕時，會彈出一個列表框。這裏用的了Activity實現，其實最好的方法可以用ActionBar,不過這貨好像只支持3.0以後的版本。本文的接上文Android仿微信底部菜單欄+頂部菜單欄（附源碼）

效果：

一、仿微信下拉列表佈局pop_dialog.xml

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >
 
    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_marginTop="45dp"
        android:layout_marginRight="20dp">

        <LinearLayout
            android:id="@+id/id_pop_dialog_layout"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:background="@drawable/pop_item_normal"
            android:orientation="vertical" >

            <LinearLayout
                android:id="@+id/id_groupchat"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:layout_marginTop="5dp"
                android:background="@drawable/pop_list_selector" >

                <ImageView
                    android:id="@+id/id_imageView1"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="8dp"
                    android:src="@drawable/pop_group" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="發起聊天"
                     android:layout_gravity="center_vertical"
                    android:textColor="#fff"
                    android:textSize="16sp" />
            </LinearLayout>

            <ImageView
                android:id="@+id/id_imageView5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/pop_line" />

            <LinearLayout
                android:id="@+id/id_addfrd"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:background="@drawable/pop_list_selector" >

                <ImageView
                    android:id="@+id/id_imageView2"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="8dp"
                    android:src="@drawable/pop_add" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="添加朋友"
                      android:layout_gravity="center_vertical"
                    android:textColor="#fff"
                    android:textSize="16sp" />
            </LinearLayout>

            <ImageView
                android:id="@+id/id_imageView5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/pop_line" />

            <LinearLayout
                android:id="@+id/id_find"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:background="@drawable/pop_list_selector" >

                <ImageView
                    android:id="@+id/id_imageView3"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="8dp"
                    android:src="@drawable/pop_qrcode" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="掃一掃"
                  android:layout_gravity="center_vertical"
                    android:textColor="#fff"
                    android:textSize="16sp" />
            </LinearLayout>

            <ImageView
                android:id="@+id/id_imageView5"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/pop_line" />

            <LinearLayout
                android:id="@+id/id_feedback"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginBottom="3dp"
                android:layout_marginLeft="5dp"
                android:layout_marginRight="5dp"
                android:background="@drawable/pop_list_selector" >

                <ImageView
                    android:id="@+id/id_imageView4"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center_vertical"
                    android:layout_marginLeft="8dp"
                    android:src="@drawable/pop_feedback" />

                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:padding="8dp"
                    android:text="幫助與反饋"
                   android:layout_gravity="center_vertical"
                    android:textColor="#fff"
                    android:textSize="16sp" />
            </LinearLayout>
        </LinearLayout>
    </RelativeLayout>

</RelativeLayout>

其中，按下圖片後變換顏色：

pop_list_selector.xml如下

pop_list_selector.xml如下

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/pop_item_pressed" android:state_focused="true"/>
    <item android:drawable="@drawable/pop_item_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/pop_item_pressed" android:state_selected="true"/>
    <item android:drawable="@drawable/pop_item_normal"/>

</selector>

看看效果，這是去掉標題欄後的（也可以用代碼去掉）

去掉標題欄的方法：

二、對應代碼

pop_dialog.xml對應的代碼爲PopDialogActivity.java

如下：

/**
 * @作者 林炳文（郵箱：[email protected]）
 * @博客 http://blog.csdn.net/evankaka/
 * @功能描述：彈出微信下拉列表框
 */
package com.example.tabexample;
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;

public class PopDialogActivity extends Activity implements OnClickListener{
	//定義四個按鈕區域
	private LinearLayout mGroupChat;
	private LinearLayout mAddFrd;
	private LinearLayout mFind;
	private LinearLayout mFeedBack;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.pop_dialog);

		initView();
	}

	/**
	 * 初始化組件
	 */
	private void initView(){
		//得到佈局組件對象並設置監聽事件
		mGroupChat = (LinearLayout)findViewById(R.id.id_groupchat);
		mAddFrd = (LinearLayout)findViewById(R.id.id_addfrd);
		mFind = (LinearLayout)findViewById(R.id.id_find);
		mFeedBack = (LinearLayout)findViewById(R.id.id_feedback);

		mGroupChat.setOnClickListener(this);
		mAddFrd.setOnClickListener(this);
		mFind.setOnClickListener(this);
		mFeedBack.setOnClickListener(this);
	}
	
	@Override
	public boolean onTouchEvent(MotionEvent event){
		finish();
		return true;
	}
	
	@Override
	public void onClick(View v) {
		
	}
}

三、設置背景透明

     如果單這樣，當這個Activity出來後，就會把之前的Activity覆蓋，但是如果把它背景設置成透明的不就可以了麼？方法如下：

在AndroidManifest.xml中添加：

          <!-- 這裏一定要註冊上這個activity，否則跳轉將會失敗，因爲系統找不到這個activity -->
        <activity
            android:name="com.example.tabexample.PopDialogActivity"
            android:label="@string/app_name" 
            android:theme="@style/MyDialogStyleTop">
        </activity>

其中

"@style/MyDialogStyleTop"

是我自己定義的格式，在value/style下添加：

    <style name="MyDialogStyleTop" parent="android:Theme.Dialog">
        <item name="android:windowFrame">@null</item><!-- 邊框 -->
        <item name="android:windowIsFloating">true</item> <!-- 是否浮現在activity之上 -->
        <item name="android:windowIsTranslucent">false</item><!-- 半透明 -->
        <item name="android:windowNoTitle">true</item> <!-- 無標題 -->
        <item name="android:windowBackground">@android:color/transparent</item><!-- 背景透明 -->
        <item name="android:backgroundDimEnabled">false</item><!-- 模糊 -->
    </style>

四、使用

其實使用就是Activity的跳轉了，方法很簡單，一句：

startActivity(new Intent(MainActivity.this,PopDialogActivity.class));

把這句放在“+”按鈕的點擊事件當中去，這裏添加點擊事件就不用說了，很簡單，然後最終的效果如下：

若你覺得此文對你有用，那就幫我贊一下～～謝謝啦