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Newbie project - start an activity from BroadcastReceive

I'm trying to build a simple daily reminder app as my first Android
project and I'm just stucked now. Too much information from hours
watching tutorials. :)
So I would like some help to understand the code behind
my idea so hopefully someone explains this with ease :)
Three times a day I want an alarm/reminder/splash to set off for ten seconds
with different pictures and sounds depending on the alarmtime.
An ability to tap/swipe to stop it before 10 seconds.
alarm1
---alarm1time08:10
---alarm1pic1.jpg
---alarm1Sound1.mp3
alarm2
---alarm2time12:30
---alarm2pic1.jpg
---alarm2Sound1.mp3
alarm3
---alarm3time18:45
---alarm3pic1.jpg
---alarm3Sound1.mp3
So how do I do this?
I'm using Android Studio 2.3 (to slow computer for 3.x...),
Java and my phones are Lollipop 5.1 API level 22 and
Marshmallow 6.0 API level 23
This is my code that actually works without error..
But now i don't know how open an activity with my image and sounds.
I got a RED startActivity when I tried it in hRec.
MainActivity.java
package com.hlm.myreminder;
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
int hHour1 = 08;
int hMin1 = 10;
Calendar hCal1 = Calendar.getInstance();
hCal1.set(Calendar.HOUR_OF_DAY, hHour1);
hCal1.set(Calendar.MINUTE, hMin1);
hCal1.set(Calendar.SECOND, 0);
Log.v("hLogging","cal set");
Intent hIntent = new Intent(getApplication(),hRec.class);
PendingIntent hPi = PendingIntent.getBroadcast(getApplicationContext(),0,hIntent,PendingIntent.FLAG_UPDATE_CURRENT);
Log.v("hLogging","intent set");
AlarmManager hAlMgr = (AlarmManager)getSystemService(ALARM_SERVICE);
hAlMgr.setRepeating(AlarmManager.RTC_WAKEUP,hCal1.getTimeInMillis(),hAlMgr.INTERVAL_DAY,hPi);
Log.v("hLogging","am set");
// startActivity(new Intent(this, hshowreminderpic1.class)); //works
// Log.v("hLogging","goto hshowreminderpic1 done"); //works
}
}
hRec.java
package com.hlm.myreminder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class hRec extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent hIntent) {
Log.d("hLogging", "hRec:BroadcastReceiverAlarm");
// show hshowreminderpic1
/* startActivity gets RED */
// startActivity(new Intent(this, hshowreminderpic1.class));
// Log.v("hLogging","goto hshowreminderpic1 request");
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.hlm.myreminder">
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="com.android.alarm.permission.SET_ALARM"/>
<application
android:allowBackup="true"
android:icon="#drawable/h_icon72"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".hshowreminderpic1"/>
<receiver android:name=".hRec"></receiver>
</application>
</manifest>

You need to pass context to start your activity from hRec.java as hRec is not an activity.
So simply write
Intent i = new Intent(context, hshowreminderpic1.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);

Try using this:
context.startActivity(new Intent(this, hshowreminderpic1.class));

Runtime errors occurred when creating map activity in android

I have created a map activity. The application is running without crash but when I open the activity it shows only google logo but google map is not loaded. Therefore I checked runtime errors it shows following errors.
Error
V/PhoneWindow: DecorView setVisiblity: visibility = 4, Parent = ViewRoot{615057f com.example.kularathna.gpstracker/com.example.kularathna.gpstracker.ticketBooking,ident = 4}, this = DecorView#dce7bbe[ticketBooking]
E/Google Maps Android API: Authorization failure. Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: AIzaSyBWfu7WllVlnzgXuNAWhU_Ca0U3EC2BDvc
Android Application (;): 6B:C7:FB:B3:C6:FE:D3:22:DA:14:AE:27:B6:88:FA:13:ED:82:63:BA;com.example.kularathna.gpstracker
W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found.
I/DynamiteModule: Considering local module com.google.android.gms.googlecertificates:0 and remote module com.google.android.gms.googlecertificates:4
Selected remote version of com.google.android.gms.googlecertificates, version >= 4
W/zygote64: Skipping duplicate class check due to unrecognized classloader
D/Surface: Surface::disconnect(this=0x7efc6d4000,api=1)
D/WindowClient: Remove from mViews: android.widget.LinearLayout{e39f9c9 V.E...... ......ID 0,0-162,75}, this = android.view.WindowManagerGlobal#7707265
Application terminated.
Following errors are showing blue color
W/DynamiteModule: Local module descriptor class for com.google.android.gms.googlecertificates not found.
W/zygote64: Skipping duplicate class check due to unrecognized classloader
Following errors are showing Brown color
E/Google Maps Android API: Authorization failure. Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
E/Google Maps Android API: In the Google Developer Console (https://console.developers.google.com)
Ensure that the "Google Maps Android API v2" is enabled.
Ensure that the following Android Key exists:
API Key: AIzaSyBWfu7WllVlnzgXuNAWhU_Ca0U3EC2BDvc
Android Application (;): 6B:C7:FB:B3:C6:FE:D3:22:DA:14:AE:27:B6:88:FA:13:ED:82:63:BA;com.example.kularathna.gpstracker
Xml file
<?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=".map">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<fragment
android:layout_width="match_parent"
android:layout_height="match_parent"
android:name="com.google.android.gms.maps.MapFragment"
android:id="#+id/fragmentMap"/>
</LinearLayout>
</RelativeLayout>
map.java file
package com.example.kularathna.gpstracker;
import android.app.Dialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
public class map extends AppCompatActivity implements OnMapReadyCallback {
GoogleMap mGoogleMap;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
if (googleServicesAvailable()){
Toast.makeText(this,"Perfect",Toast.LENGTH_LONG).show();
initMap();
}else {
// No Google Map Layout
}
}
private void initMap() {
MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.fragmentMap);
mapFragment.getMapAsync(this);
}
public boolean googleServicesAvailable(){
GoogleApiAvailability api = GoogleApiAvailability.getInstance();
int isAvailable = api.isGooglePlayServicesAvailable(this);
if (isAvailable == ConnectionResult.SUCCESS){
return true;
}else if (api.isUserResolvableError(isAvailable)){
Dialog dialog = api.getErrorDialog(this,isAvailable,0);
dialog.show();
}else {
Toast.makeText(this,"Can't connect to play services",Toast.LENGTH_LONG).show();
}
return false;
}
#Override
public void onMapReady(GoogleMap googleMap) {
mGoogleMap = googleMap;
goToLocationZoom(39.008224,-76.8984527,15);
}
private void goToLocation(double longitude, double latitude) {
LatLng latLng = new LatLng (longitude,latitude);
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLng (latLng);
mGoogleMap.moveCamera (cameraUpdate);
}
private void goToLocationZoom(double longitude, double latitude, float zoom) {
LatLng latLng = new LatLng (longitude,latitude);
CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(latLng, zoom);
mGoogleMap.moveCamera (cameraUpdate);
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.kularathna.gpstracker">
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<permission android:name="com.example.kularathna.gpstracker.permission.MAPS_RECEIVE" android:protectionLevel="signature"/>
<uses-permission android:name="com.example.kularathna.gpstracker.permission.MAPS_RECEIVE"/>
<uses-permission android:name="com.google.android.providers.gsf.permissions.READ_GSERVICES"/>
<uses-feature android:glEsVersion="0x00020000" android:required="true"/>
<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">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ticketBooking" />
<activity android:name=".registration" />
<activity android:name=".arrive" />
<activity android:name=".home" />
<activity android:name=".reserveSeats" />
<activity android:name=".seatSelection" />
<activity android:name=".map"></activity>
<meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="AIzaSyBWfu7WllVlnzgXuNAWhU_Ca0U3EC2BDvc"/>
<meta-data android:name="com.google.android.gms.version" android:value="#integer/google_play_services_version"/>
</application>
</manifest>
API Key screen shot
API key screen shot

Is the SHA key registered with the api key in the google console is same as your machine's SHA key from where you generating the APK. Try to remove the restriction of SHA key from console and run the app

Same issue happened for me, i resolved by enabling
Maps SDK for Android
Enabled API like below image,
Also make sure generate API key for your application with package name like below image,

Android Studio can't get button to call

The button works when its alone without the WebView but once I add that only the WebView works and clicking the button does nothing.
Here's my MainActivty.java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myWebView = (WebView) findViewById(R.id.myWebView);
WebSettings webSettings = myWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
myWebView.loadUrl("http://");
}
Intent intentCall;
public void onClick(View v){
intentCall.setAction("android.intent.action.CALL");
intentCall.setData(Uri.parse("tel:"));
startActivity(intentCall);
finish();
}}
Here's my Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="org.yellowribbon.evindrake.yellowribbonv3" >
<uses-permission android:name="android.permission.CALL_PHONE"></uses-permission>
<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" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Activity_Main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
android:paddingBottom="#dimen/activity_vertical_margin"
tools:context="org.yellowribbon.evindrake.yellowribbonv3.MainActivity">
<WebView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:id="#+id/myWebView"
android:layout_alignParentBottom="true" />
<Button
android:text="#string/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>

Push-buttons can be pressed, or clicked, by the user to perform an action!
A typical use of a push-button in an activity would be the following:
.
public class MyActivity extends Activity {
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.content_layout_id);
final Button button = (Button) findViewById(R.id.button_id);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
}
});
}
}
However, instead of applying an OnClickListener to the button in your activity, you can assign a method to your button in the XML layout, using the android:onClick. You are trying to achieve that without this attribute!
Now, when a user clicks the button, the Android system calls the activity's myClickMethod(View)(that i created) method. In order for this to work, the method must be public and accept a View as its only parameter. For example:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="myClickMethod"
android:text="button" />
and in code
public void myClickMethod(View view) {
// Perform action on click after identify the view
}
Also you are getting a null pointer because of Intent intentCall
use your onClick(View v) like below,
public void onClick(View v) {
String number = "18002738255";
Uri call = Uri.parse("tel:" + number);
Intent surf = new Intent(Intent.ACTION_CALL, call);
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
return;
}
startActivity(surf);
}

Add code to inside button component in activity_main.xml file
android:onClick="onClick"

communication between two device using sms

I want my program to be able to receive sms from a special number("+9856874236").
I want application to be recive SMS ,if the SMS is contain "enable wifi" ,then change wifi to enable
i 'm using this code but it working crash??
MainActivity
package com.example.sms;
import android.app.Activity;
import android.content.Context;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;
public class MainActivity extends Activity {
static TextView messageBox;
static String x="";
static Context context;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
messageBox=(TextView)findViewById(R.id.messageBox);
check();
}
//How to used other or many activity
#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_main, menu);
return true;
}
public static void updateMessageBox(String msg,String from)
{
messageBox.append(msg);
//Get parent phone number from database
//check parent number with ...
if(msg.equals("enable wifi"))
{
x="yes";
MainActivity objSampleClass = new MainActivity();
objSampleClass.check();
}
//context.startActivity(new Intent(context, MainActivity.class));
//Intent i=new Intent(context, p1.class);
//context.startActivity(i);
}
public void check()
{
if(x.equals("yes"))
{
WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
wifi.setWifiEnabled(true);
}
else
{
}
}
}
manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.sms"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.sms.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>
<receiver android:name="com.example.sms.TextMessageReceiver" >
<intent-filter>
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>
<activity
android:name="com.example.sms.Test"
android:label="#string/title_activity_test" >
</activity>
</application>
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" >
</uses-permission>
<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" >
</uses-permission>
</manifest>

To intercept the SMS as early as possible I use the following code:
public class Communicator extends Service {
private final String TAG = this.getClass().getSimpleName();
private SMSReceiver mSMSreceiver;
private IntentFilter mIntentFilter;
#Override
public void onCreate()
{
super.onCreate();
Log.i(TAG, "Communicator started");
//SMS event receiver
mSMSreceiver = new SMSReceiver();
mIntentFilter = new IntentFilter();
mIntentFilter.addAction("android.provider.Telephony.SMS_RECEIVED");
mIntentFilter.setPriority(2147483647);
registerReceiver(mSMSreceiver, mIntentFilter);
Intent intent = new Intent("android.provider.Telephony.SMS_RECEIVED");
List<ResolveInfo> infos = getPackageManager().queryBroadcastReceivers(intent, 0);
for (ResolveInfo info : infos) {
Log.i(TAG, "Receiver name:" + info.activityInfo.name + "; priority=" + info.priority);
}
}
#Override
public void onDestroy()
{
super.onDestroy();
// Unregister the SMS receiver
unregisterReceiver(mSMSreceiver);
}
#Override
public IBinder onBind(Intent arg0) {
return null;
}
private class SMSReceiver extends BroadcastReceiver
{
private final String TAG = this.getClass().getSimpleName();
#Override
public void onReceive(Context context, Intent intent)
{
Bundle extras = intent.getExtras();
String strMessage = "";
if ( extras != null )
{
Object[] smsextras = (Object[]) extras.get( "pdus" );
for ( int i = 0; i < smsextras.length; i++ )
{
SmsMessage smsmsg = SmsMessage.createFromPdu((byte[])smsextras[i]);
String strMsgBody = smsmsg.getMessageBody().toString();
String strMsgSrc = smsmsg.getOriginatingAddress();
strMessage += "SMS from " + strMsgSrc + " : " + strMsgBody;
Log.i(TAG, strMessage);
if (strMsgBody.contains("SomeText")) {
// perform code
this.abortBroadcast();
}
}
}
}
}
}
Remember to register the service in manifest:
<service android:name="yourpackage.Communicator" />
Now in onCreate and onDestroy start and stop the service:
startService(new Intent(this, Communicator.class));
stopService(new Intent(this, Communicator.class));

In your BroadcastReceiver use following code,
Uri uri = Uri.parse("content://sms/");
ContentResolver contentResolver = getContentResolver();
String phoneNumber = "+9856874236";
String sms = "address='"+ phoneNumber + "'";
Cursor cursor = contentResolver.query(uri, new String[] { "_id", "body" }, "read = 0 and address='" + sms, null, null);
if ( cursor.getCount() > 0 )
{
// perform action to start Wifi Connection
}
Also in AndroidManifest.xml file you need to set Priority for reading SMS by your application as follows,
<receiver android:name="com.example.sms.TextMessageReceiver" >
<intent-filter android:priority="1000">
<action android:name="android.provider.Telephony.SMS_RECEIVED" />
</intent-filter>
</receiver>

Google tv emulator doesnt show my website propertly

I did a web to show different videos in HTML5,and the web works.
Now I would like to do a google tv app and show this web and work with it.
I try with a webView component but the part with javascript doesnt work and show like a plain text($function...) and the rest appear without any format.
This is my Activity:
public class Test extends Activity {
WebView mWebView;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.vid);
mWebView = (WebView) findViewById(R.id.web);
mWebView.getSettings().setJavaScriptEnabled(true);
if (savedInstanceState != null) {
mWebView.restoreState(savedInstanceState);
} else {
mWebView.loadUrl("http://192.168.2.103:8080/VirtualSTBJSF/vid.xhtml");
mWebView.setWebViewClient(new verMiWeb());
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mWebView.saveState(outState);
}
#Override
public void onStop() {
super.onStop();
mWebView.stopLoading();
}
#Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK && mWebView.canGoBack()) {
mWebView.goBack();
}
return super.onKeyDown(keyCode, event);
}
}
class verMiWeb extends WebViewClient {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
}
and the layout:
<?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" >
<WebView
android:id="#+id/web"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
Any idea?
Thanks for the answers.