Develop Reference

Not able to Launch an App on Boot in Android TV

I want to automatically launch my app on TV startup. i.e. when the user power on the TV, TV will powerup and my app will start.
I have followed multiple links on internet and tried to implement it but no activity is shown on startup.
Followed
How to start/ launch application at boot time Android
As I was not getting any response on start, followed Android-Boot Completed is not working in Broadcastreceiver
I have extensively searched web and stackoverflow, it is strange that I cannot find a solution to make it work till now. Don't know what am I doing wrong...
here is my code...
MainActivity.java
public class MainActivity extends FragmentActivity {
public WebView mWebview;
private android.content.Context Context;
private ProgressDialog mProgressDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
String url = "http://www.test.com";
if (!DetectConnection.checkInternetConnection(this)) {
Toast.makeText(getApplicationContext(), "No Internet Connection!", Toast.LENGTH_LONG).show();
finish(); //Calling this method to close this activity when internet is not available.
} else {
WebView webView = (WebView) findViewById(R.id.main_fragment);
webView.getSettings().setJavaScriptEnabled(true);
CookieManager.getInstance().setAcceptCookie(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
WebSettings webSettings = webView.getSettings();
webSettings.setDomStorageEnabled(true);
webSettings.setLayoutAlgorithm(WebSettings.LayoutAlgorithm.NARROW_COLUMNS);
webSettings.setUseWideViewPort(true);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl(url);
}
}
StartAppOnBoot.java
public class StartAppOnBoot extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction() == null) {
return;
}
//if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
boolean startupAfterBoot = prefs.getBoolean("serenity_boot_startup", false);
if (startupAfterBoot) {
Intent i = new Intent(context, MainActivity.class);
//i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
}
}
Manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.test.tv2"
tools:ignore="MissingLeanbackLauncher">
<uses-feature
android:name="android.software.leanback"
android:required="false" />
<uses-feature
android:name="android.hardware.touchscreen"
android:required="false" />
<application
android:usesCleartextTraffic="true"
android:allowBackup="true"
android:icon="#drawable/ic_banner"
android:label="TV2"
android:supportsRtl="true"
tools:ignore="GoogleAppIndexingWarning"
android:banner="#mipmap/tv_banner_foreground">
<activity android:name="com.test.tv2.MainActivity"
android:screenOrientation="landscape"
android:theme="#style/Theme.Leanback"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LEANBACK_LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name="com.test.tv2.StartAppOnBoot"
android:enabled="true"
android:exported="true">
<intent-filter android:priority="1000">
<action android:name="android.intent.action.BOOT_COMPLETED" />
<category android:name="android.intent.category.DEFAULT" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
</manifest>

How to dispatch intent to MainActivity from another activity? (react native)

I've created a custom deep link dispatcher in Java within a react native project.
The issue I'm having is that I can't get MainActivity to start from my dispatcher, and I can't quite figure out why.
I have AndroidManifest set up so that the deep link is captured in LinkDispatcherActivity effectively, but the startActivity(dispatchedIntent) never reaches MainActivity, which is where I assume it needs to go. Ordinarily in AndroidManifest.xml, deep links would be sent to MainActivity).
It does open the app, but I assume it's because LinkDispatcherActivity is part of the app? Not sure, if I say something dumb it's because this is only my 3rd day in a row writing Java 😰
Below is my code.
package com.example.app;
//Inspired by https://github.com/justeat/Android.Samples.Deeplinks, Licensed under Apache 2.0
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import net.openid.appauth.RedirectUriReceiverActivity;
public class LinkDispatcherActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
dispatchIntent(getIntent());
} catch (IllegalArgumentException iae) {
// Malformed URL
if (BuildConfig.DEBUG) {
Log.e("Deep links", "Invalid URI", iae);
}
} finally {
// Always finish the activity so that it doesn't stay in our history
finish();
}
}
public void dispatchIntent(Intent intent) {
final Uri uri = intent.getData();
final String host = uri.getHost().toLowerCase();
if (uri == null) throw new IllegalArgumentException("Uri cannot be null");
// Default intent
Intent dispatchedIntent = new Intent(LinkDispatcherActivity.this, MainActivity.class);
dispatchedIntent.setData(uri);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
Log.d(dispatchedIntent.getDataString(), "dispatchIntent: intent string");
// Auth intent only, this is why I need the dispatcher
if ("login".equals(host)) {
dispatchedIntent = new Intent(this, RedirectUriReceiverActivity.class);
dispatchedIntent.putExtra("requestCode", 0);
Log.d("Login", "mapAppLink: ");
startActivityForResult(dispatchedIntent, 0);
return;
}
Log.d("Default", "mapAppLink: ");
startActivity(dispatchedIntent);
}
}
This is what my AndroidManifest.xml looks like:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
package="com.example.app">
<!-- < Only if you're using GCM or localNotificationSchedule() > -->
<uses-permission android:name="android.permission.WAKE_LOCK" />
<permission
android:name="${applicationId}.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="${applicationId}.permission.C2D_MESSAGE" />
<!-- < Only if you're using GCM or localNotificationSchedule() > -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<application
android:name=".MainApplication"
android:allowBackup="false"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:theme="#style/AppTheme"
android:requestLegacyExternalStorage="true">
<meta-data
android:name="com.google.android.geo.API_KEY"
android:value="<redacted>" />
<!-- < Notification Services > -->
<meta-data
android:name="com.google.firebase.messaging.default_notification_icon"
android:resource="#mipmap/ic_notification" />
<meta-data
android:name="com.google.firebase.messaging.default_notification_color"
tools:replace="android:resource"
android:resource="#color/colorAccent" />
<!-- Change the value to true to enable pop-up for in foreground on receiving remote notifications (for prevent duplicating while showing local notifications set this to false) -->
<meta-data android:name="com.dieam.reactnativepushnotification.notification_foreground"
android:value="true"/>
<meta-data
android:name="com.google.firebase.messaging.default_notification_channel_id"
tools:replace="android:value"
android:value="rn-push-notification-channel-id" />
<meta-data android:name="com.dieam.reactnativepushnotification.notification_channel_name" android:value="Default Channel"/>
<meta-data android:name="com.dieam.reactnativepushnotification.notification_channel_description" android:value="Default channel for push notifications"/>
<meta-data
android:name="com.dieam.reactnativepushnotification.notification_color"
android:resource="#color/colorAccent" />
<receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationActions" />
<receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationPublisher" />
<receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationBootEventReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
<action android:name="com.htc.intent.action.QUICKBOOT_POWERON"/>
</intent-filter>
</receiver>
<!-- START: Add this-->
<service
android:name=".MainNotificationService">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT"/>
</intent-filter>
</service>
<receiver
android:name="com.intercom.reactnative.RNIntercomPushBroadcastReceiver"
tools:replace="android:exported"
android:exported="true"/>
<activity
android:name=".MainActivity"
android:configChanges="keyboard|keyboardHidden|screenSize|uiMode"
android:launchMode="singleTask"
android:label="#string/app_name"
android:screenOrientation="portrait"
android:windowSoftInputMode="adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<action android:name="android.intent.action.DOWNLOAD_COMPLETE" />
</intent-filter>
</activity>
<activity android:name=".LinkDispatcherActivity"
tools:node="replace">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data
android:scheme="example"
android:host="login" />
</intent-filter>
</activity>
<activity android:name="com.facebook.react.devsupport.DevSettingsActivity" />
</application>
</manifest>
Edit: for the intent, I've tried:
new Intent(getApplicationContext(), MainActivity.class)
new Intent(reactContext, MainActivity.class) (extending ReactActivity instead of Activity)
new Intent(this, MainActivity.class)
new Intent("MainActivity")

Try adding RedirectUriReceiverActivity to the manifest - I couldn't see it in there.
<activity android:name="com.facebook.react.devsupport.RedirectUriReceiverActivity" />

This is what I ended up with for the LinkDispatcherActivity. To summarize, what I did was dispatch the intents that the deep activities were eventually supposed to invoke directly, instead of trying to forward the intent. In other words, if you're trying to pass an intent from one activity to another, maybe don't and consider dispatching the activity/function/intent that you want to run afterwards. I still think forwarding the intent should have worked, but this is what ended up working.
In order to accomplish the above, I:
Called a function within the AppAuth package that generates an intent, and dispatch it
Used ReactContext to emit the url listener event that React Native uses to respond to deep links.
Below is the code:
//Inspired by https://github.com/justeat/Android.Samples.Deeplinks, Licensed under Apache 2.0
package com.example.app;
import android.content.Intent;
import android.net.Uri;
import android.util.Log;
import net.openid.appauth.AuthorizationManagementActivity;
import com.facebook.react.ReactActivity;
import com.facebook.react.ReactInstanceManager;
import com.facebook.react.bridge.Arguments;
import com.facebook.react.bridge.ReactContext;
import com.facebook.react.bridge.WritableMap;
import com.facebook.react.modules.core.DeviceEventManagerModule;
public class LinkDispatcherActivity extends ReactActivity {
#Override
protected void onResume() {
super.onResume();
try {
dispatchIntent(getIntent());
} catch (IllegalArgumentException iae) {
// Malformed URL
if (BuildConfig.DEBUG) {
Log.e("Deep links", "Invalid URI", iae);
}
} finally {
// Always finish the activity so that it doesn't stay in our history
finish();
}
}
public void dispatchIntent(Intent intent) {
final Uri uri = intent.getData();
final String host = uri.getHost().toLowerCase();
if (uri == null) throw new IllegalArgumentException("Uri cannot be null");
// Default intent, e.g. settings, fitbit
// wait for react context
ReactInstanceManager reactInstanceManager = getReactInstanceManager();
ReactContext reactContext = reactInstanceManager.getCurrentReactContext();
Intent dispatchedIntent = new Intent(getApplicationContext(), MainActivity.class);
dispatchedIntent.setData(uri);
dispatchedIntent.putExtra("url", uri.toString());
dispatchedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_SINGLE_TOP);
// Auth intent only
if ("login".equals(host)) {
Intent authIntent = AuthorizationManagementActivity.createResponseHandlingIntent(getApplicationContext(), uri);
startActivity(authIntent);
return;
}
// Below from https://stackoverflow.com/questions/48445010/send-data-from-android-activity-to-react-native?rq=1
WritableMap uriMap = Arguments.createMap();
uriMap.putString("url", uri.toString());
if(reactContext != null) {
reactContext.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
.emit("url", uriMap);
// If there's no context, create a listener to wait for it
} else {
reactInstanceManager.addReactInstanceEventListener(new ReactInstanceManager.ReactInstanceEventListener() {
#Override
public void onReactContextInitialized(ReactContext context) {
context.getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
.emit("url", uriMap);
reactInstanceManager.removeReactInstanceEventListener(this);
}
});
}
}
}

Can not go to the next page

I want go to next page(mainActivity). I was able to sign up and send that information to the database. But only the success message and the ok button come out. Errors not come out. plz check my code.
LogingActivity.java
package com.life.registeration;
import android.content.Intent;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.toolbox.Volley;
import org.json.JSONObject;
public class LoginActivity extends AppCompatActivity {
private AlertDialog dialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
TextView registerButton = (TextView) findViewById(R.id.registerButton);
registerButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
Intent registerIntent = new Intent(LoginActivity.this, RegisterActivity.class);
LoginActivity.this.startActivity(registerIntent);
}
});
final EditText idText = (EditText) findViewById(R.id.idText);
final EditText passwordText = (EditText) findViewById(R.id.passwordText);
final Button loginButton = (Button) findViewById(R.id.loginButton);
loginButton.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View view) {
String userID = idText.getText().toString();
String userPassword = passwordText.getText().toString();
Response.Listener<String> responseListener = new Response.Listener<String>(){
#Override
public void onResponse(String response) {
try {
JSONObject jsonResponse = new JSONObject(response);
boolean success = jsonResponse.getBoolean("success");
if(success){
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
dialog = builder.setMessage("Login success.")
.setPositiveButton("ok", null)
.create();
dialog.show();
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
LoginActivity.this.startActivity(intent);
finish();
}
else{
AlertDialog.Builder builder = new AlertDialog.Builder(LoginActivity.this);
dialog = builder.setMessage("please, check your id.")
.setNegativeButton("re try", null)
.create();
dialog.show();
}
}
catch (Exception e) {
e.printStackTrace();
}
}
};
LoginRequest loginRequest = new LoginRequest(userID, userPassword, responseListener);
RequestQueue queue = Volley.newRequestQueue(LoginActivity.this);
queue.add(loginRequest);
}
});
}
#Override
protected void onStop(){
super.onStop();
if(dialog != null){
dialog.dismiss();
dialog = null;
}
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.life.registeration">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme.NoActionBar">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity" /><!-- ATTENTION: This was auto-generated to add Google Play services to your project for
App Indexing. See https://g.co/AppIndexing/AndroidStudio for more information. -->
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
</application>

With answer of Prerak Sola add your Activity on Manifest.xml:
<activity android:name=".MainActivity" />
Use your .setPositiveButton properly , your OK click event is null - .setPositiveButton("ok", null):
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Intent intent = new Intent(LoginActivity.this, MainActivity.class);
startActivity(intent);
}
}).create();
dialog.show();

You have not registered your MainActivity in AndroidManifest.xml file. Add the line <activity android:name=".MainActivity" /> in the manifest file. So it should look like:
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.life.registeration">
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme.NoActionBar">
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".RegisterActivity" />
<activity android:name=".MainActivity" />
<meta-data
android:name="com.google.android.gms.version"
android:value="#integer/google_play_services_version" />
</application>

Program runs with no errors but button wont open

I have been following the mybringback tutorials on youtube and I tried implementing what I learned. Trying to get a button on my main page to open another page. Finally got the program to run without errors but now when I press the button nothing opens.
Main .xml file where my button is
<Button
android:id="#+id/btnChpt3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:text="Appearance and Grooming Policies"
android:textSize="18sp"
android:textStyle="bold|italic"
android:gravity="center"
/>
Name of .xml file im trying to get to is chapter3.xml
Menu.java
package com.th3ramr0d.learnar670_1;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Menu extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button chapterThree = (Button) findViewById(R.id.btnChpt3);
chapterThree.setOnClickListener(new View.OnClickListener() {
// #Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent("com.th3ramr0d.learnar670_1.CHAPTER3"));
}
});
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
}
And my manifest.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.th3ramr0d.learnar670_1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
<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>
<activity
android:name=".Menu"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.th3ramr0d.learnar670_1.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Chapter3"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.th3ramr0d.learnar670_1.CHAPTER3" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
So button ided as btnChpt3 wont open up my .xml file named chapter3.xml. Thanks for the help.
Here is my Chapter3.java
package com.th3ramr0d.learnar670_1;
import android.app.Activity;
import android.os.Bundle;
public class Chapter3 extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.chapter3);
}
}
Here is my MainActivity.java
package com.th3ramr0d.learnar670_1;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_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.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}

Copy this and paste in your AndroidManifest and try,
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.th3ramr0d.learnar670_1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".Menu"
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=".Chapter3"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.th3ramr0d.learnar670_1.CHAPTER3" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
To help you understand the problem,
<category android:name="android.intent.category.LAUNCHER" />
The code above in the AndroidManifest defines the activity to be launced when the App Icon is pressed. As per your earlier manifest, it launches the activity MainActivity which also sets it setContentView(R.layout.activity_main); by default as the IDE creates a Hello World program.
So when you launch you app, its MainActivity (that looks the same layout you have designed) which is loading and not Menu activity which you want to load. Hence making few changes in the manifest where we declare the Menu activity as the launcher now launches Menu activity which has the piece of code to process your button click.
I hope this helped!

Actually you can try a more convenient way of starting activities inside your application:
startActivity(new Intent(Menu.this, Chapter3.class))
Also you can read more how it works here:
http://developer.android.com/training/basics/firstapp/starting-activity.html

Good day.
Try replacing the line :
startActivity(new Intent("com.th3ramr0d.learnar670_1.CHAPTER3"));
with the code below :
Intent intent = new Intent(Menu.this, Chapter3.class);
startActivity(intent);
Try reverting your code to the original code, copy your layout activity_main.xml and rename it menu.xml.
now in the layout menu.xml change this line:
android:text="Appearance and Grooming Policies"
to:
android:text="Go to menu"
and the line:
android:id="#+id/btnChpt3"
with:
android:id="#+id/btnMenu"
and replace the line:
setContentView(R.layout.activity_main);
in Menu.java with:
setContentView(R.layout.menu.xml);
finally in MainActivity.java add the following to your oncreate method:
Button btnGoToMenu = (Button) findViewById(R.id.btnMenu);
btnGoToMenu.setOnClickListener(new View.OnClickListener() {
// #Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, Menu.class);
startActivity(intent);
}
});
and re-run the application.

Why do I get a syntax error on line 1?

I'm trying to get this to open an url when the icon is selected/clicked, but I get Syntax error on tokens, delete these tokens on the line String url =
String url = "http://www.google.co.uk/";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
Manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.openurl"
android:versionCode="1"
android:versionName="1.0" >
<application>
<activity android:name="OpenURL" 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>
I've now got a bit further on this one but when I load the apk file the icon opens the browser with 2 windows - blank and the url. I;m also unable to use the back button to close the browser - it keeps opening the url. How can I correct these issues?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="14" />
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name">
<activity
android:name="com.example.myapp.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>
package com.example.myapp;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String url = "http://www.google.co.uk";
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse(url));
startActivity(i);
}
}
Many thanks again!

This
String url = "http://www.google.co.uk/";
can never be the first line of a java file.
You file need a structure like:
package a.b.c; // optional
import java.util.List; // optional
public class ClassName { // mandatory
// your code
} // mandatory
If this fixes your error, you should consider reading a Java tutorial.

First of all add the permission for internet in your manifest:
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
then your main should be like this:
public class Main extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.yourmainlayout);
Button button = (Button) findViewById(R.id.yourbuttonid);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v) {
String url = "http://www.google.co.uk/";
Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(i);
}});
}
}