覆盖以前的申请

Question

我的应用程序出现问题，当我向某人发送APK时，安装该应用程序的唯一方法是卸载前一个应用程序。在类似的应用程序上安装其他应用程序工作正常，只需使用此应用程序。这很关键，因为我们假设应用程序有更新，我不希望用户在安装新版本之前必须卸载以前的版本，并且应该自动覆盖。

以下是清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.dooba.beta"
    android:versionCode="1"
    android:versionName="1.0" >

       <!-- for card.io card scanning -->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.VIBRATE" />

    <uses-feature android:name="android.hardware.camera" android:required="false" />
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false" />

    <!-- for most things, including card.io & paypal -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
    <uses-permission android:name="android.permission.INTERNET"/>
         <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>




    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

    <application
        android:name="com.dooba.beta.IntegratingFacebookTutorialApplication"
        android:allowBackup="true"
        android:largeHeap = "true"
        android:icon="@drawable/logo3"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.dooba.beta.LoginActivity"
            android:label="@string/app_name"
            android:launchMode="singleTop"
            android:screenOrientation="portrait"
            android:theme="@android:style/Theme.Holo.Light.NoActionBar" > 
                <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter> 

        </activity>
        <activity
            android:name="com.dooba.beta.UserDetailsActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">

            </activity>
        <activity
            android:name="com.dooba.beta.EventsActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">


        </activity>



        <activity 
            android:name="com.dooba.beta.CasualEventsActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
           android:theme="@style/CustomActionBarTheme"
             >
              <meta-data android:name="android.support.UI_OPTIONS"
                   android:value="splitActionBarWhenNarrow" />

        </activity>


        <activity
            android:name="com.dooba.beta.CultureEventsActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">


        </activity>

        <activity
            android:name="com.dooba.beta.EntertainmentEventsActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">


        </activity>

             <activity
            android:name="com.dooba.beta.introActivity"
            android:label="@string/app_name"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">


        </activity>
        <activity
            android:name="com.facebook.LoginActivity"
            android:label="@string/app_name"
            android:theme="@android:style/Theme.Translucent.NoTitleBar" />

        <meta-data
            android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/app_id" />

        <activity
            android:name="com.dooba.beta.MoodActivity"
            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">
         </activity>

        <activity
            android:name="com.dooba.beta.ProfileChange"

            android:screenOrientation="portrait"
            android:theme="@style/CustomActionBarTheme">


        </activity>



    </application>

</manifest>

非常感谢任何帮助。提前谢谢。