Develop Reference

Opening other application from my own app

I know that this question was asked and answered many times, but i cant find those answers useful to my program so i decided to ask another as my own. So i have two applications AppA and AppB, i want to open a certain activity of AppA from AppB here's my code for AppB :
public class AppB extends Activity {
static Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
context = this;
}
public void openNoti(View v) throws NameNotFoundException {
Intent i;
PackageManager manager = getPackageManager();
try {
i = manager.getLaunchIntentForPackage("com.example.stealth.AppA");
if (i == null)
throw new PackageManager.NameNotFoundException();
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);
} catch (PackageManager.NameNotFoundException e) {
Toast.makeText(getApplicationContext(), "error", 1000).show();
}
}
}
Im sure that i am invoking the right package name or address of AppA, but it just cant find it, saying that i might have not declared it on my Manifest.xml.
Here's Manifest for AppB :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.stealth"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.stealth.AppB"
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>
</manifest>
and here is the manifest of AppA :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.stealth"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.stealth.AppA"
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>
</manifest>
Please help me thank you. :)

ok the problem is with the package you are calling for
you have same name in two apps package com.example.stealth
and you are calling
"com.example.stealth.AppA" which is not there
Now rename AppA package to "com.example.stealth.AppA" it will work

Android runtime error (real device only): SecurityException

The app works on my Genymotion emulator but fails when running on the real device with this exception on startup:
Launching application: <package>/<package>.MainActivity.
DEVICE SHELL COMMAND: am start -D -n "<package>/<package>.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER
Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=<package>/.MainActivity }
java.lang.SecurityException: Permission Denial: starting Intent { act=<package>.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=<package>/.MainActivity } from null (pid=21943, uid=2000) not exported from uid 10204
at android.os.Parcel.readException(Parcel.java:1425)
at android.os.Parcel.readException(Parcel.java:1379)
at android.app.ActivityManagerProxy.startActivityAsUser(ActivityManagerNative.java:2204)
at com.android.commands.am.Am.runStart(Am.java:494)
at com.android.commands.am.Am.run(Am.java:109)
at com.android.commands.am.Am.main(Am.java:82)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:243)
at dalvik.system.NativeStart.main(Native Method)
Waiting for process: <package>
Here's my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="<package>"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="17"
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="<package>.MainActivity"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
And MainActivity.java:
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
What's going on? Why would it be trying to run as a particular user when I'm just using a normal configuration?

Change below in you menifest.xml file
<activity
android:name="<package>.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>

You should define your activity something like this in manifest
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#android:style/AppTheme" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>

unknown intent intent

This is the error that shows on my logcat when i run my TagViewer.java for NFC on Eclipse. I am running a NFC program and basically it runs however at a certain period of time the program shuts down on its own.
08-29 14:06:33.677: E/ViewTag(22056): Unknown intent Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.android.nfc/.TagViewer }
This is from my Android Manifest. I am guessing that the error is from here because of the line on the error android.intent.action.MAIN and such.
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.nfc"
android:versionCode="1"
android:versionName="1.0" >
<uses-permission android:name="android.permission.NFC" />
<uses-permission android:name="android.permission.CALL_PHONE"/>
<uses-feature android:name="android.hardware.nfc" android:required="true"/>
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="16" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".TagViewer"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<intent-filter>
<action android:name="android.nfc.action.TAG_DISCOVERED"/>
<category android:name="android.intent.category.DEFAULT"/>
</intent-filter>
</intent-filter>
</activity>
</application>
</manifest>
this is from my java and basically the last line, when i put // the program will not shut down but it will show like a white page.However the title NFC is still showing so i know that it is slightly working
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTagContent = (LinearLayout) findViewById(R.id.tag_viewer);
mTitle = (TextView) findViewById(R.id.title);
resolveIntent(getIntent());
}

Change your Declaration activity "TagViewer" instead of ".TagViewer"

SecurityException at starting intent of a new empty Activity

I have developed a little project using just one Activity, and now, I'm trying to add a new one, but, I recieve this error when I'm trying to launch the project on my device:
Running com.android.gl2jni/.TestActivity... 1> Starting: Intent {
cmp=com.android.gl2jni/.TestActivity } 1> 1>
java.lang.SecurityException: Permission Denial: starting Intent {
flg=0x10000000 cmp=com.android.gl2jni/.TestActivity } from null
(pid=2935, uid=2000) requires null
I'm not trying to call the new Activity, and I have developed an empty Activity to check why I can't launch the app.
This is my Manisfest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.android.gl2jni">
<uses-feature android:glEsVersion="0x00020000"/>
<uses-sdk android:minSdkVersion="9"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<application
android:label="#string/gl2jni_activity">
<!--main activity-->
<activity android:name=".GL2JNIActivity"
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
android:launchMode="singleTask"
android:configChanges="keyboardHidden"
android:screenOrientation="landscape"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--BT device list activity-->
<activity android:name=".TestActivity"
>
<intent-filter>
</intent-filter>
</activity>
<!--
<activity android:name=".BluetoothDeviceListActivity"
android:label="#string/select_device"
android:theme="#android:style/Theme.Dialog"
android:configChanges="keyboardHidden"
android:screenOrientation="landscape"
/>
-->
</application>
</manifest>
And this is the empty activity class:
package com.android.gl2jni;
import android.app.Activity;
import android.util.Log;
import android.os.Bundle;
public class TestActivity extends Activity {
#Override protected void onCreate(Bundle icicle) {
LogConsole.print( "HI, I AM TestActivity" );
}
}
I suppose that I have to modify something else more, but I don't know what...
Thanks in advance for the help.

You've specified an empty intent filter for TestActivity. An empty intent filter matches NO intents. Remove these lines from the block for TestActivity:
<intent-filter>
</intent-filter>
Also, in onCreate() of TestActivity you must call super.onCreate(), otherwise Android will crash it.

Unable to instantiate activity ComponentInfo java.lang.ClassNotFoundException: util.kalyan.HelloGoogleMapsActivity

I have included all the necessary fields correctly.
But still, I am not able to launch the Google map on my emulator.
Checked the internet permissions also.
Getting error like:
E/AndroidRuntime(2064): java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{util.kalyan/util.kalyan.HelloGoogleMapsActivity}:
java.lang.ClassNotFoundException: util.kalyan.HelloGoogleMapsActivity
Please find below my code.
HelloGoogleMapsActivity.java
package util.kalyan;
import android.os.Bundle;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapView;
import util.kalyan.R;
public class HelloGoogleMapsActivity extends MapActivity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
}
#Override
protected boolean isRouteDisplayed()
{
return false;
}
}
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="util.kalyan"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<uses-library android:name="com.google.android.maps"></uses-library>
<application android:icon="#drawable/ic_launcher" android:label="#string/app_name" >
<activity android:name=".HelloGoogleMapsActivity" 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>
</application>
<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.INTERNET" />
</manifest>
Any one please help me in this at the earliest.
Thanks in advance.

Change the android:name in activity definition
from
<activity android:name=".HelloGoogleMapsActivity" ../>
to
<activity android:name="util.kalyan.HelloGoogleMapsActivity" ../>

You emulator target should be one that includes Google APIs (Google Inc.).

Right click on your HelloGoogleMapsActivity class > BuildPath > Exclude Then Right click on your HelloGoogleMapsActivity class > BuildPath > Include your class again