Here's the problem guys, first i tried to run my application with Launch default activity as launch action (Run Configurations --> Android --> Launch action), the logcat kept telling me that it can't find the launcher activity and the application wouldn't even start, problem is i defined my launcher activity in the manifest file, but it's like it's not reading it at all.
So i tried to launch the splash activity by specifically telling it to run it through run configurations, it did launch but during the transition to the next activity it crashed again, the logcat says no activity found to handle intent, which again, I defined the way I did in other applications and worked alright there. Plase help it's a nightmare.
Here's the code for the MainActivity:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Thread timer = new Thread()
{
public void run(){
try{
sleep(6000);
} catch (InterruptedException e){
e.printStackTrace();
} finally {
Intent openStarting = new Intent("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);
}
}
};
timer.start();
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
finish();
}
}
And Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="totaltrainer.com"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<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="totaltrainer.com.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutPlace"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutPlace" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutHome"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutHome" />
</intent-filter>
</activity>
<activity
android:name=".WorkoutGym"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.WorkoutGym" />
</intent-filter>
</activity>
</application>
</manifest>
use "totaltrainer.com.WORKOUTGYM" and so on
and below use this
<category android:name="android.intent.category.DEFAULT" />
Problem 1
logcat kept telling me that it can't find the launcher activity and
the application wouldn't even start
In your Manifest file, change below
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="totaltrainer.com.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
as
<activity android:name="MainActivity">
<!-- This activity is the main entry, should appear in app launcher -->
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
What happens when you define this Action and Category ?
The ACTION_MAIN action indicates this is the main entry point and does not expect any intent data.
The CATEGORY_LAUNCHER category indicates that this activity's icon should be placed in the system's app launcher. If the element does not specify an icon with icon, then the system uses the icon from the element.
These two must be paired together in order for the activity to appear in the app launcher.
Problem 2
the logcat says no activity found to handle intent
Your Manifest declaration seems fine.
In your activity class, change
Intent openStarting = new Intent("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);
as
Intent openStarting = new Intent();
openStarting.setAction("totaltrainer.com.WorkoutPlace");
startActivity(openStarting);
I am recently facing a problem while creating new android application in both eclipse as well as android studio.
I am using same SDK in both eclipse and android studio.
When I create a new application and i simply run it. The launcher activity was getting loaded twice.
Means, I am getting MainActivity loading twice one on top of another.
OnCreate() method of my MainActivity also got invoked twice.
The code goes like follows
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sample"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="21"
android:targetSdkVersion="22" />
<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>
MainActivity.java
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
System.out.println("OnCreate Invoked");
}
}
Output
OnCreate Invoked
OnCreate Invoked
Can you please help me in resolving this issue.
Thanks in advance.
It seems you are getting multiple instance of your first activity.
Use this in manifest of 1st activity:
android:launchMode="singleTop"
If I set orientation programatically in onCreate - I can reproduce this issue.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}
If needed, set activity orientation in the manifest file like this.
<activity
android:name=".MainActivity"
android:screenOrientation="landscape">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
As i am new to android programming, I don't know how to call a certain class and/or certain activity first.
For example i have two classes viz. 1) Login.java 2) Create.java and two xml files associated with them are activity_main.xml and create_new.xml respectively.
So how can i make Login.java run first with activity_main.xml as screen?
in login java use this
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);}
in create java us this
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.create_new);
in androidmanifest
<activity
android:name=".Login"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
and another activities
<activity android:name=".MainActivity" ></activity>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.your.package"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.your.package.activity.Login"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.your.package.activity.Create"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
In this case, the intent-filter of LOGIN activity specifies that the intent with action of MAIN and category of LAUNCHER will be caught by it, aka it is where the application starts.
Afterwards,
public class Login extends Activity
{
//honestly I'd name this class LoginActivity and same in the XML
#Override
public void onCreate(Bundle saveInstanceState)
{
super.onCreate(saveInstanceState);
setContentView(R.layout.activity_main);
}
....
}
Also look at this example to learn how to use Fragments:
NullPointerException accessing views in onCreate()
from the intent filters you decalre in the android manifest file of your project;see the image
You declare an intent filter in the activity tag something like shown in the image for making it the first activity of your application.and if there are other activities in your app having intent filters than you have to just change the capital letter MAIN to DEFAULT in the intent filter tag
You will find AndroidManifest file like in the following image in your project
Just started working with android and ran into a small problem. I am have a TabActivity that is loading 3 other Activity classes. This works great. I then have a button on the other Activity classes that I would like to launch a MapActivity. When I do that I keep getting a Force Close.
I googled but I cannot figure out if it is the manifest file or something else. The idea is the tabs are showing location information and you click a button to plot it on the map and get directions.
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.location_tab);
...
Button btnMap = (Button) findViewById(R.id.btnLaunchMap);
btnMap.setOnClickListener(mMapListener);
}
private OnClickListener mMapListener = new OnClickListener() {
public void onClick(View v) {
Intent mapIntent = new Intent(getApplicationContext(),LocationMap.class);
startActivity(mapIntent);
}
};
If I launch any other activity it works but not launching the mapactivity. If I take the mapactivity class and put it in a new project it works.
My manifest
<uses-permission android:name="android.permission.INTERNET" />
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Splash"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Locations"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar"></activity>
<activity android:name=".LocationNewYork"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar">
</activity>
<activity android:name=".LocationChicago"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar"></activity>
<activity android:name=".LocationSeattle"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar"></activity>
<activity android:name=".LocationMap"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar">
</activity>
<uses-library android:name="com.google.android.maps"/>
</application>
thougths?
<action android:name="android.intent.action.MAIN" />
inside of the mapactivity's instance ACTIVITY field in the Manifest file does it.
So if you have a MapActivity named QMap, the following code in the Manifest actually works:
<activity android:name=".QMap"><action android:name="android.intent.action.MAIN" /></activity>
Hope it helped
I had the same problem, wanted to launch map activity from an other activity over onClick-event, the problem was: errors in the MapActivity
If you are using eclipse try to run "debug as" without setting any breakpoints
I have one of my activities which I would like to prevent from rotating because I'm starting an AsyncTask, and screen rotation makes it restart.
Is there a way to tell this activity "DO NOT ROTATE the screen even if the user is shaking his phone like mad"?
Add
android:screenOrientation="portrait"
or
android:screenOrientation="landscape"
to the <activity> element/s in
the manifest and you're done.
You can follow the logic below to prevent auto rotate screen while your AsyncTask is running:
Store your current screen orientation inside your activity using getRequestedOrientation().
Disable auto screen orientation using setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR).
Run/execute your AsyncTask.
At the end of your AsyncTask restore your previous orientation status using setRequestedOrientation(oldOrientation).
Please note that there are several ways to access Activity (which runs on UI thread) properties inside an AsyncTask. You can implement your AsyncTask as an inner class or you can use message Handler that poke your Activiy class.
The easiest way I found to do this was to put
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
within onCreate, just after
setContentView(R.layout.activity_main);
so...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
In your Manifest file, for each Activity that you want to lock the screen rotation add: if you want to lock it in horizontal mode:
<activity
...
...
android:screenOrientation="landscape">
or if you want to lock it in vertical mode:
<activity
...
...
android:screenOrientation="portrait">
Rather than going into the AndroidManifest, you could just do this:
screenOrientation = getResources().getConfiguration().orientation;
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
... AsyncTask
screenOrientation = getResources().getConfiguration().orientation;
#Override
protected void onPostExecute(String things) {
context.setRequestedOrientation(PlayListFragment.screenOrientation);
or
context.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);
}
The only drawback here is that it requires API level 18 or higher. So basically this is the tip of the spear.
Activity.java
#Override
public void onConfigurationChanged(Configuration newConfig) {
try {
super.onConfigurationChanged(newConfig);
if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
// land
} else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {
// port
}
} catch (Exception ex) {
}
AndroidManifest.xml
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name="QRCodeActivity" android:label="#string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
User "portrait" in your AndroidManifest.xml file might seem like a good solution. But it forces certain devices (that work best in landscape) to go into portrait, not getting the proper orientation. On the latest Android version, you will get wearing an error. So my suggestion it's better to use "nosensor".
<activity
...
...
android:screenOrientation="nosensor">
Add the following to your AndroidManifest.xml
[ app > src > main > AndroidManifest.xml ]
<activity android:name=".MainActivity"
android:configChanges="orientation"
android:screenOrientation="portrait"/>
Example:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xxx.zzzzzz.yyyyy">
<uses-permission android:name="A-PERMISSION" />
<application>
<activity android:name=".MainActivity"
android:screenOrientation="portrait"
android:configChanges="orientation">
</activity>
</application>
</manifest>
The following attribute on the ACTIVITY in AndroidManifest.xml is all you need:
android:configChanges="orientation"
So, the full activity node would be:
<activity android:name="Activity1"
android:icon="#drawable/icon"
android:label="App Name"
android:excludeFromRecents="true"
android:configChanges="orientation">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
Add:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);
...
...
...
}
Prevent Screen Rotation just add this following line in your Manifests.
<activity
android:name=".YourActivity"
android:screenOrientation="portrait" />
This works for me.
android:screenOrientation="portrait"
on application tag <application
and
<activity
...
...
android:screenOrientation="locked">
If you are using Android Developer Tools (ADT) and Eclipse
you can go to your AndroidManifest.xml --> Application tab --> go down and select your activity. Finally, select your preferred orientation.
You can select one of the many options.
You have to add the following code in the manifest.xml file.
The activity for which it should not rotate, in that activity add this element
android:screenOrientation="portrait"
Then it will not rotate.
You can try This way
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.itclanbd.spaceusers">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".Login_Activity"
android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Use AsyncTaskLoader to keep your data safe even if the activity changes, instead of using AsyncTask that is a better way to build apps than preventing screen rotation.