I am new to Android SDK,but I know JAVA a little.I am on SDK v4.The problem is that,I tried to make 'HelloWidget' Home Screen Widget (with just a text box),and when I try to run the project,the console gives me
No Launcher Activity Found!
The application will only sync the package to the device!
And my app is nowhere to be found in the AVD.I had tried putting the .MAIN and Launcher in Intent filter,but no good.Here are my files:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="ax.startup"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<!-- Broadcast Receiver that will process AppWidget updates -->
<receiver android:name=".AxStartup" android:label="AxStartup">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="android.appwidget.provider"
android:resource="#layout/startup_info" />
</receiver>
</application>
</manifest>
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/txt1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="HELLO WORLD" />
</LinearLayout>
startup_info.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<EditText
android:id="#+id/txt1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:text="ITS WORKING DUDE!"
android:minWidth="146dip"
android:minHeight="72dip"
android:updatePeriodMillis="10000"
android:initialLayout="#layout/startup_info">
<requestFocus />
</EditText>
</LinearLayout>
Java file
package ax.startup;
import android.appwidget.AppWidgetProvider;
public class AxStartup extends AppWidgetProvider {
}
I followed the tutorial from here:
http://www.helloandroid.com/files/xmaswidget/android_howto-hellowidget.pdf
And another strange problem is that when I long press on desktop,only options to change wallpaper is coming.There is no 'Add to Home Screen' or 'Widgets' or any other menu!!!
Please tell me what is the problem.
An application widget can not be launched with a MAIN action, only activities. Also, if your app only has an application widget you will not see an app icon. The log messages are saying that the app was deployed to the emulator but you must start the app widget manually.
Go to the home screen on the device and do a long-press on the screen. You will get a menu to add an element to the home screen. One of the options will be "Widgets". Select that and navigate to your app widget. Your app widget will now be on the home screen.
Related
I have an android program with 2 layouts. The first layout is Login. When the login is started first, I have no problem. When I try to change in AndroidManifest from login to splash layout, I got an error. The error is like the title of this posts.
In this android manifest, I change my code from :
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
>
<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>
</application>
to :
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/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.LAUNCHER" />
</intent-filter>
</activity>
</application>
Here is the layout for login:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:orientation="vertical"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin" tools:context=".Login">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Your total is 0"
android:textSize="45dp"
android:gravity="center"
android:id="#+id/tvDisplay"
/>
<Button
android:layout_width="250dp"
android:layout_height="100dp"
android:text="Add One"
android:gravity="center"
android:layout_gravity="center"
android:id="#+id/bAdd"
android:textSize="20dp"/>
<Button
android:layout_width="250dp"
android:layout_height="100dp"
android:text="Substract One"
android:gravity="center"
android:layout_gravity="center"
android:id="#+id/bSub"
android:textSize="20dp"/>
And here the layout of splash:
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
android:background="#drawable/sertifikat"
tools:context=".Splash"></LinearLayout>
And structure of my code :
Log in logcat:
Here splash.java
How can I fix my code?
Hey You missed some small things
Here is a small example from your code
on Github that i wrote
This is running example of your code
Other than the ending tags
The <intent-filter>
should only be one
most probably the problem lies in your #drawable
as well as look at these tutorials they are great
http://www.androidhive.info/2013/07/how-to-implement-android-splash-screen-2/
Obviously，you have lost a character '/' in the splash layout at the end.
You are missing the closing tag of your LinearLayout in splash.xml. Add </LinearLayout> to the end of the file. You also might want to consider using an ImageView with android:scaleType="centerCrop" instead of using a LinearLayout with a background. Using android:background will stretch to fit the size of the screen, which can give a different aspect ratio on different devices, whereas an ImageView will scale it to maintain the aspect ratio (depending on the scaleType).
Also, a LinearLayout is not appropriate for a single image, since it is meant to be a container for other views.
For better performance I recommend you to follow this :
http://www.cutehacks.com/blog/2014/01/13/splash-screens
If you use an high end device you won't see a big difference, but for common devices you will see an huge improvement
My bare-bones test app sets the orientation to landscape on start up. It has a layout and layout-port directory. There is a simple layout file in each directory. They contain a textview with text set to either "Landscape" or "Portrait".
In my test I start the app on a tablet tipped into portrait. With this code, I would expect the layout from /layout/my_layout.xml to be used, but /layout-port/my_layout.xml is used instead. I've also tried making a /layout-land directory but still no luck.
From my main activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Start app with tablet in portrait orientation
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
int o = this.getRequestedOrientation();
// o is 0, indicating landscape. Display shifted to landscape
setContentView(R.layout.my_layout);
// layout-port/my_layout.xml is loaded. INCORRECT I think
}
/layout/my_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff000000">
<TextView
android:id="#+id/tvLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Landscape"
android:textSize="50sp"
android:textColor="#ffffffff"/>
</LinearLayout>
/layout-port/my_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ff000000">
<TextView
android:id="#+id/tvLabel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Portrait"
android:textSize="50sp"
android:textColor="#ffffffff"/>
</LinearLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mytest"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.mytest.ActivityMain"
android:configChanges="keyboardHidden|orientation|screenSize"
android:label="#string/app_name"
android:windowSoftInputMode="stateHidden|adjustPan" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Change /res/layout/my_layout.xml to /res/layout-land/my_layout.xml
Note: I added the suffix -land
Your have to remove option "orientation" in manifest:
android:configChanges="screenSize|orientation|keyboardHidden"
Because this option says you handle it by yourself...
Good explanation here:
I have been reading Google's android tutorial and I got a problem... In the tutorial they explain the XML elements (EditText and Button) and in the end they say how to tun the program to see the button + the text field.
The problem is, that the emulator doesn't show them.. just a black screen.
I even tried adding this line to the onCreate function -
System.out.println("Hello World!");
but still the emulator is showing only black screen..
Here's the .java main file - http://pastebin.com/G5J9YjNe
And the XML files (I mentioned what code is what file) - http://pastebin.com/VnRwAfMW
What should I do?
Thanks a lot for everyone who will help!
System.out.println("Hello World!");
does not print any thing on screen. it can seen on Consol. i tried below code and working fine for me.
// Main Activity
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.kuchbhi);
System.out.println("Hello World!");
}
Layout /.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<EditText android:id="#+id/text_message"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="enter text" />
<Button android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:text="Send" />
</LinearLayout>
Manifest file ..
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<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>
</manifest>
try this code and let me know what u see.
I tried your source code and it is working fine for me. see screen
Update
After adding the following style and setting it for my application, I have gotten it draw the whole screen:
<resources>
<style name="app_theme" parent="android:Theme.NoTitleBar">
<item name="android:windowBackground">#color/green</item>
</style>
</resources>
While developing my first Android app I've realized that my apps' views never span the entire screen whereas other sample projects I have downloaded do. To test this I have created a basic activity class and set the background of a TextView to green to see how much it is spanning. Forgive me if this is a stupid question but I am new to this.
Here is the screenshot:
Here is the complete HomeActivity Source:
public class HomeActivity extends Activity
{
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
Here is the layout file (/res/layout/main.xml):
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Hello World, StackOverflow"
android:background="#00FF00"
/>
</LinearLayout>
and here is a screenshot of another app in the emulator working fine, spanning the whole window:
Edit
I edited my XML file to now be:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#00FF00"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Hello World, StackOverflow"
/>
</LinearLayout>
Then cleaned and built, ran and got the same exact view.
Edit 2
I removed the "vertical" orientation line as requested, no change.
Here is my AndroidManifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.blah.blah.myCrap"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application android:label="#string/app_name" >
<activity android:name="HomeActivity"
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>
Added the following to my manifest under <application>
<supports-screens android:resizeable="true"
android:smallScreens="true"
android:normalScreens="true"
android:largeScreens="true"
android:anyDensity="true" />
Still the wrong size.
It's coming fine on Android 2.2 emulator
Check your manifest to see if it supports different screen sizes. You can find more information in this QA ( fill_parent is not filling entire screen in LinearLayout )
Apparently, if you don't specify that it supports small, normal, large, anydensity screen sizes, you can have issues with layouts not filling the entire screen.
Trying to get an Android 2.2 application to start up with a SurfaceView as the base view with a button placed atop it located near the bottom of the screen. So far, no luck. It crashes every time it attempts to launch. I've checked to make sure that the activity is registered in the manifest.
Here's my java code:
public class Dragable extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
and here's my main.xml:
<?xml version="1.0" encoding="utf-8"?>
<SurfaceView xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/surface_home"
>
<Button
android:id="#+id/add_new"
android:text="#string/add_new"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
/>
</SurfaceView>
and my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="#drawable/icon" android:label="#string/app_name">
<activity android:name=".Dragable"
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>
<uses-sdk android:minSdkVersion="8" />
</manifest>
and here's my error:
11-29 11:58:52.620: ERROR/AndroidRuntime(512): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example/com.example.Dragable}: java.lang.ClassCastException: android.view.SurfaceView
Can't seem to find anything related doing searches on SO. My appologies if this has been asked before.
Now I see the problem. SurfaceView is not a container, I mean it does not extends ViewGroup, so you can't put a Button inside a SurfaceView. What you can do is wrapping the SurfaceView and the Button within a RelativeLayout.
You are not using any container to place components. Use this and make changes
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<SurfaceView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/surface_home"
>
<Button
android:id="#+id/add_new"
android:text="#string/add_new"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
/>
</SurfaceView>
</FrameLayout>