We Keep Coding

Splash screen alpha animation not working

So I have an app that currently has two Activities. A SplashScreenActivity and a MainActivity. The transition between the two activities works just fine but the problem lies in the SplashScreenActivity itself. In it, there is a single ImageView that is supposed to be initially invisible and then fade in. But instead the image remains invisible the entire time. Please help. Here's the code:
The SplashScreenActivity:
package com.degioncloud;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ImageView;
public class SplashScreenActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splashscreen);
ImageView logo = (ImageView) findViewById(R.id.iv_logo);
logo.setImageAlpha(0);
logo.animate().alpha(1f).setDuration(1200).withEndAction(new Runnable() {
#Override
public void run() {
Intent i = new Intent(SplashScreenActivity.this, MainActivity.class);
startActivity(i);
overridePendingTransition(android.R.anim.fade_in,android.R.anim.fade_out);
finish();
}
});
}
}
The XML of the SplashScreenActivity:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SplashScreenActivity">
<ImageView
android:id="#+id/iv_logo"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#mipmap/ic_launcher"
android:layout_centerInParent="true" />
</RelativeLayout>
My Manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.degioncloud">
<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/Theme.DegionCloud">
<activity android:name=".MainActivity" />
<activity android:name=".SplashScreenActivity"
android:theme="#style/SplashScreenTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
The MainActivty is empty so I don't see a need to share that but if you need any other file then let me know and I will send a copy.

You need to call start() for the animation to begin:
logo.animate().alpha(1f).setDuration(1200).withEndAction(new Runnable() {
#Override
public void run() {
Intent i = new Intent(SplashScreenActivity.this, MainActivity.class);
startActivity(i);
overridePendingTransition(android.R.anim.fade_in,android.R.anim.fade_out);
finish();
}
}).start();

Battery Widget did not work, won't refresh the status of the battery

I don't know, what I'm doing wrong.
After launching my widget, I can see the battery status, but it doesn't refresh itself at all when I manually give telnet the "power capacity xx" command.
MainActivity.java
public class MainActivity extends AppWidgetProvider
{
#Override
public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds)
{
RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.activity_main);
Intent received = context.getApplicationContext()
.registerReceiver(null, new IntentFilter(Intent.ACTION_BATTERY_CHANGED));
String receivedAction = received.getAction();
if (receivedAction.equals(Intent.ACTION_BATTERY_CHANGED))
{
int level = received.getIntExtra("level", 0);
views.setTextViewText(R.id.TextView1, level + "%!");
ComponentName appComponent = new ComponentName(context, MainActivity.class);
appWidgetManager.getInstance(context).updateAppWidget(appComponent, views);
}
}
}
widgetxml.xml
<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider
xmlns:android="http://schemas.android.com/apk/res/android"
android:minWidth="72dp"
android:minHeight="72dp"
android:updatePeriodMillis="1800000"
android:initialLayout="#layout/activity_main"
>
</appwidget-provider>
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/TextView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello_world" />
</RelativeLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.widgetownia"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:label="#string/app_name"
android:icon="#drawable/ic_launcher" >
<receiver android:name=".MainActivity" android:label="#string/app_name">
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE"> </action>
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="#xml/widgetxml" > </meta-data>
</receiver>
</application>
</manifest>

As you are using AppWidgetProvider you can update your widget either from any activity or in your case you can update it from service. Check below links to know how to refresh widget.
Programmatically update widget from activity/service/receiver
Force Android widget to update
Also check wonderful tutorial provided by vogella explaining everything about widget. It also shows how to update widget via click on it or from any service.
http://www.vogella.com/tutorials/AndroidWidgets/article.html

QuickContactBadge crashes app:

I have searched around but none of the solutions worked for my specific case. If I add
QuickContactBadge contactBadge = (QuickContactBadge) findViewById(R.id.quickContactBadge);
I it crashes. Then I changed it to:
QuickContactBadge contactBadge;
protected void onCreate(Bundle savedInstanceState) {
...
contactBadge = (QuickContactBadge) findViewById(R.id.quickContactBadge);
}
And it doesn't crash. But if I add contactBadge.Anything(); it crashes. No matter what
method it crashes. I.E. contactBadge.assignContactFromEmail("foo#foo.com", true);
Android Activity:
public class MainActivity extends Activity {
QuickContactBadge contactBadge;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction().add(R.id.container, new MainFragment()).commit();
}
contactBadge = (QuickContactBadge) findViewById(R.id.quickContactBadge);
contactBadge.assignContactFromEmail("pointlightproductions.net#gmail.com", true);
}
public static class MainFragment extends Fragment {
public MainFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.pointlight.android.kingdomcraft"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/android:Theme.Holo.NoActionBar" >
<activity
android:name="com.pointlight.android.kingdomcraft.MainActivity"
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>
</manifest>
Layout:
<RelativeLayout 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"
tools:context="com.pointlight.android.kingdomcraft.MainActivity$MainFragment" >
<QuickContactBadge
android:id="#+id/quickContactBadge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>

First method: You're calling findViewById() when the activity is instantiated and its member variables are initialized. The activity won't have a Window yet and it will NPE. Call findViewById() only in onCreate() or later, after setContentView().
Second method: You don't have setContentView() with a view hierarchy that has a view with the given id. null is returned and invoking method on it will NPE.
From the code you later added, it seems the view is in your fragment layout and not the activity layout. It won't be a part of the activity view hierarchy in onCreate(). You should move the code to the fragment's onCreateView() instead:
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
contactBadge = (QuickContactBadge) rootView.findViewById(R.id.quickContactBadge);
contactBadge.assignContactFromEmail("pointlightproductions.net#gmail.com", true);

Debug Error while running

I have tried with both solutions given for my previous problem which was giving me error in Google Map, the reason was I was mixing API1 and API2 code structure in my example, but after I got this reason of my problem I have again create 2 examples one for API1 and second for API2 but in any of example I had not got solution it can not run my application into tablet and gives me problem like:
"Application stopped unexpectedly.please try again".
So anybody can help me exacltly where I'm wrong, I'm going to put my whole code of API1 example and API2 example with this forum.
Google Map API1 example
AndroidManifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.googlemapapi1_21march"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<application android:icon="#drawable/ic_launcher" android:label="#string/app_name">
<uses-library android:name="com.google.android.maps" />
<activity android:label="#string/app_name" android:name=".MapMarkerActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainLayout.XML
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.google.android.maps.MapView
android:id="#+id/mapView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:enabled="true"
android:clickable="true"
android:apiKey="0l4sCTTyRmXTNo7k8DREHvEaLar2UmHGwnhZVHQ"
/>
<LinearLayout android:id="#+id/zoom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
/>
</RelativeLayout>
MainActivity.java
public class GM1_21_MarchMainActivity extends MapActivity {
MapView mapView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gm1_21__march_main);
mapView = (MapView) findViewById(R.id.mapView);
LinearLayout zoomLayout = (LinearLayout)findViewById(R.id.zoom);
View zoomView = mapView.getZoomControls();
zoomLayout.addView(zoomView,
new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
mapView.displayZoomControls(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_gm1_21__march_main, menu);
return true;
}
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}
Google Map API2 example
AndroidManifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.googlemapapi2_21march"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<permission android:name="com.example.googlemapapi2_21march.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<uses-permission android:name="com.example.googlemapapi2_21march.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.googlemapapi2_21march.GMAPI2_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>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="AIzaSyAy_I76CpPtTMq3X6P8y78OamvLf_yaHJI" />
</manifest>
MainLayout.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" >
<fragment
android:name="com.google.android.gms.maps.SupportMapFragment"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:id="#+id/map"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
MainActivity.java
public class GMAPI2_MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_gmapi2__main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_gmapi2__main, menu);
return true;
}
}

For the Google Maps API V2, for what I see now you are using the wrong Activity for your map layout. You are using the SupportMapFragment fragment, and there for you have to use the FragmentActivity object and not a simple Activity. try to change it to FragmentActivity.
And tell us what changed.

How do I display a Simple Google Map in my emulator in android?

I tried to write a simple google map application to display simple map but doesn't give me any output.
I pasted my code below:
AnroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.HelloGoogleMaps"
android:versionCode="1"
android:versionName="1.0">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<application android:icon="#drawable/icon" android:label="#string/app_name">
<uses-library android:name="com.google.android.maps" />
<activity android:name=".HelloGoogleMaps"
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>
My layout file is:
map.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<com.google.android.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey="0Z1oyeAgSpj4FSEtenPqiL7RsCXA_pVPQhvtpdA"
/>
</LinearLayout>
And my java class file is:
HelloGoogleMaps.java
package org.HelloGoogleMaps;
import com.google.android.maps.MapView;
import android.app.Activity;
import android.os.Bundle;
public class HelloGoogleMaps extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.map);
MapView mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
}
protected boolean isRouteDisplayed() {
return false;
}
}

I can't see your layout file, but have you set a proper API key?
http://code.google.com/android/maps-api-signup.html

Your HelloGoogleMaps should inherit the MapsActivity
Just change your code to
public class HelloGoogleMaps extends MapActivity {
#Override
protected boolean isRouteDisplayed() {
// TODO Auto-generated method stub
return false;
}
}