Error Handling: Repeat No Launcher activity found!

Error Handling: Repeat No Launcher activity found!

Repeat No Launcher activity found! Error message and Solution

No Launcher activity found in Android Application Development! Is a common error, and the solution is also very simple.

I have been developing Android for a long time. I believe that I will not easily make this mistake, but today I have encountered it again. I have already added it to the AndroidManifest. xml file.

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

Where is the problem?

Let's look at the specific code first.

The AndroidManifest. xml file contains the following content:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.app.test"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="9"        android:targetSdkVersion="15" />    <uses-permission android:name="android.permission.NFC" />    <uses-feature        android:name="android.hardware.nfc"        android:required="true" />    <application        android:allowBackup="true"        android:debuggable="true"        android:icon="@drawable/icon"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.app.test.MainActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />                <action android:name="android.nfc.action.TAG_DISCOVERED" />            </intent-filter>        </activity>    </application></manifest>

The information in the console during running is as follows:

This is the case when I run it multiple times, and no problem is found.

After multiple experiments, You can adjust AndroidManifest. xml as follows.

The adjusted AndroidManifest. xml file is as follows:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="mexxen.app.test"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="9"        android:targetSdkVersion="15" />    <uses-permission android:name="android.permission.NFC" />    <uses-feature        android:name="android.hardware.nfc"        android:required="true" />    <application        android:allowBackup="true"        android:debuggable="true"        android:icon="@drawable/icon"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="mexxen.app.test.MainActivity"            android:label="@string/title_activity_main" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>            <intent-filter>                <category android:name="android.intent.category.TAG_DISCOVERED" />            </intent-filter>        </activity>    </application></manifest>

The running effect is as follows:

Conclusion:

When specifying the Activity to start the main interface, try not to put irrelevant actions, category and LAUNCHER in a <intent-filter>.

----------------------------------

Welcome to browse, technical exchange, respect for labor achievements, repost, please indicate the source, thank you! Http://blog.csdn.net/netwalk/article/details/35289751