Develop Reference

Name of my app not showing on top of activity. Showing "com.example.(appname).(file name)

When first starting a simple app, usually the title of the app is on the top of the activity. However, for me, it says com.example.inventory.MainActivity and then when I switch activities to another one, it'll say com.example.inventory.AddProduct
This is my AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.inventory">
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".ProductList"></activity>
<activity android:name=".AddProduct" />
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
I'm a beginner so sorry if I forgot to include any other important file.

You need to add a label for your activity like this:
<activity android:name=".ProductList"
android:label = "Product Screen"></activity>
Replace Product Screen with the Title of your choice.
Do the same for all the other activities in the Manifest.xml

Android: declaring particular activity as the launcher activity

I am just starting with android and trying to alter my android manifext .xml file such that a particular activity is launched first. My code is as follows:
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".CrimeListActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".CrimeActivity">
</activity>
</application>
I have a CrimeListActivity java class which simply should display an empty activity. However, it continues to default to displaying the activity that was specified in the manifest originally. ( In this case, .CrimeActivity.
It's hard to be more specific without posting too much code so I'm hoping someone could give me a couple pointers on where to start poking around when issues like this arise.
Thanks!

Android internet permissions for second activity

I have been trying to download some stuff from the internet in my app, but in the second activity. I have added the permission request, and it works in my first activity, but not in the second one? is there anything i'm forgetting? otherwise, why would i possibly be getting a permission error?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ruslan.seriesstuff">
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".Main2Activity">
</activity>
</application>

The problem occurred because of the newer version of android, in my case 6.0. I solved this problem by doing the following. Long press on the app icon in your phone, drag it to the appeared icon of app info. There go to the permissions of the app and make sure you have actually provided the permission to the internet. That's it!

can't open android app from menu/ problems with permisions

I have a problem with launching this app through menu. There is no problem when I start it using a different application that has permission. This is the manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.michael.dangerouslab" >
<uses-permission android:name="course.labs.permissions.DANGEROUS_ACTIVITY_PERM"/>
<permission android:name="course.labs.permissions.DANGEROUS_ACTIVITY_PERM"
android:protectionLevel="dangerous"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme"
android:permission="course.labs.permissions.DANGEROUS_ACTIVITY_PERM">
<activity android:name=".DangerDanger" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="course.labs.permissions.DANGEROUS_ACTIVITY"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</activity>
</application>
</manifest>

Delete both occurrences of android:permission="course.labs.permissions.DANGEROUS_ACTIVITY_PERM" (one in <application>, one in <activity>).
Those say "no third-party app, including the home screen, can do anything with my app, unless they have <uses-permission android:name="course.labs.permissions.DANGEROUS_ACTIVITY_PERM"/> in their manifest". There are roughly zero apps that have such an element, including roughly zero home screen implementations. Hence, you will not be able to launch your app.

Application starting with different activity, Android Studio

first timer here (both in development and posting in SO). I've used idunnololz to create an animated listview for a simple reference app I'm trying to make. It's turned out really well, but after I've created it, when I run the app to test it, it now runs as AnimatedExpandableListView both in the ActionBar title and in the app drawer. I've searched here and found that you can get the app to launch with a different activity by editing the AndroidManifest.xml, so I verified that I'm pointing to my MainActivity class:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
I presume this may be an issue with the MainActivity class, but maybe there's something here that I'm missing?

I found my answer here:
Android: App name shows the first page name, not the app name
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter **NEED #string/app_name HERE**>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>