signed apk not working on my device

Question

I have signed my .apk with the export signed apk wizard in the manifest, I am trying to deploy it on my device but it doesn't work even there's no problem happened in the signing process, when I install it on my device it started to install and it stop showing me (application not installed).

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.nazzelha.elfagr"
android:installLocation="auto"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="16" />
<supports-screens
    android:anyDensity="true"
    android:largeScreens="true"
    android:normalScreens="true"
    android:resizeable="true"
    android:smallScreens="true" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<!-- Mobclix Required Permissions " -->
<uses-permission android:name="android.permission.READ_PHONE_STATE" >
</uses-permission>
<!-- Mobclix Optional Permissions -->
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
</uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" >
</uses-permission>
<application
    android:allowTaskReparenting="true"
    android:debuggable="false"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:permission="android.permission.ACCESS_COARSE_LOCATION"
    android:theme="@android:style/Theme.Light.NoTitleBar" >
    <activity
        android:name=".FeedsActivity"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Activity1"
        android:screenOrientation="portrait" />
    <activity
        android:name=".Activity2"
        android:screenOrientation="portrait" />
    <activity
        android:name=".Activity3"
        android:screenOrientation="portrait" />
    <activity
        android:name=".InfoActivity"
        android:screenOrientation="portrait" />
    <!-- Twitter -->
    <activity
        android:name="com.ecs.android.sample.twitter.PrepareRequestTokenActivity"
        android:launchMode="singleTask"
        android:screenOrientation="portrait" >
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />

            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />

            <data
                android:host="callback"
                android:scheme="x-oauthflow-twitter" />
        </intent-filter>
    </activity>
    <!-- Mobclix and AdMob Required Parameter -->
    <meta-data
        android:name="com.mobclix.APPLICATION_ID"
        android:value="ID" />
    <meta-data
        android:name="ADMOB_PUBLISHER_ID"
        android:value="ID" />
    <activity
        android:name="com.google.ads.AdActivity"
        android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode"
        android:screenOrientation="portrait" />
    <activity
        android:name="com.mobclix.android.sdk.MobclixBrowserActivity"
        android:screenOrientation="portrait" />
</application>

Answer 1

You need to uninstall the app that's on your phone first, then you'll be able to install from your .apk

Now that I know the error you're getting, the problem is a little more strange.. I've found a similar problem here . According to the last comment, his problem was a bad line on androidmanifest.xml. Maybe you should check your manifest to see if everything's ok.