安装的应用程序中缺少图标？

Question

So I have been working on a basic android application but when ever I load it on the emulator it used to work but now the icon is simply not there its not installed the application. I have tried all version of the Android this did not fix the issue. I tried using my own Android device it worked for 3 days and then it simply stopped working as well. So each time I compile the code it works but the application is not installed on any device what so ever. So far I tried factor reset phone, Reinstall Android Studio and Different Emulator version nothing worked.

Any ideas or solutions?

Manifest :

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".Splash"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.example.edgaraxelsson.myapplication.STARTINGPOINT" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Menu"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="com.example.edgaraxelsson.myapplication.MENU" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Text"
        android:label="@string/app_name" >

    </activity>
</application>

Compiler output :

Testing started at 10:19 ...
Waiting for device.
Target device: samsung-sm_g900f-cd9e70da
Uploading file
    local path: C:\Users\Edgar Axelsson\AndroidStudioProjects\MyApplication2\app\build\outputs\apk\app-debug.apk
    remote path: /data/local/tmp/com.example.edgaraxelsson.myapplication
No apk changes detected. Skipping file upload.
Uploading file
    local path: C:\Users\Edgar Axelsson\AndroidStudioProjects\MyApplication2\app\build\outputs\apk\app-debug-test-unaligned.apk
    remote path: /data/local/tmp/com.example.edgaraxelsson.myapplication.test
No apk changes detected. Skipping file upload.
Running tests
Test running startedFinish

Answer 1

I think your issue is you changed something in the manifest between the app working and its current state. As a disclaimer, I'm not an Android specialist but something jumps out at me right away in terms of my experience - you don't have a launcher category defined for any of your activities.

From the Android Intent documentation (emphasis mine):

Intents are matched against intent filters not only to discover a target component to activate, but also to discover something about the set of components on the device. For example, the Home app populates the app launcher by finding all the activities with intent filters that specify the ACTION_MAIN action and CATEGORY_LAUNCHER category .

This is what you're missing in your manifest; a LAUNCHER .

In every app I've made there was one; I just altered the manifest of the current app I'm working on to reflect a DEFAULT for my launcher activity, and it broke.

So, in your manifest you have...

<intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.DEFAULT" />
    ...

I think you should "match" your intents and do...

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

instead.