My app crashes when I try to navigate to another activity. Why does that happen?
I'm able to start the other activity when I launch it at first so there's no problem in the CheckUsernameActivity.
public class CheckNumberActivity extends AppCompatActivity {
EditText phoneNumberEditText;
Button countryCodeButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_check_number);
Button button = (Button) findViewById(R.id.okButton);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
countryCodeButton = (Button) findViewById(R.id.countryCodeButton);
phoneNumberEditText = (EditText) findViewById(R.id.phoneNumberEditText);
Log.v("areaCode", countryCodeButton.getText().toString());
Log.v("phoneNumber", phoneNumberEditText.getText().toString());
Intent k = new Intent(CheckNumberActivity.this, CheckUsernameActivity.class);
startActivity(k);
}
});
}
}
Try This way. I think it will help you.
public class CheckNumberActivity extends AppCompatActivity {
EditText phoneNumberEditText;
Button countryCodeButton;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_check_number);
Button button = (Button) findViewById(R.id.okButton);
countryCodeButton = (Button) findViewById(R.id.countryCodeButton);
phoneNumberEditText = (EditText) findViewById(R.id.phoneNumberEditText);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.v("areaCode", countryCodeButton.getText().toString());
Log.v("phoneNumber", phoneNumberEditText.getText().toString());
Intent k = new Intent(CheckNumberActivity.this, CheckUsernameActivity.class);
startActivity(k);
}
});
}
}
I didn't have my new activity defined in my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.dimsumdev.runk" >
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity android:name=".activity.CheckNumberActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".activity.CheckUsernameActivity" >
<!--Default Intent Filter-->
<intent-filter>
<action android:name="android.intent.action.DEFAULT" />
</intent-filter>
</activity>
<activity android:name=".activity.HomeActivity" >
</activity>
</application>
</manifest>
Related
i'm a student and i'm working on a mobile app.
The probleme is that my app was working, but now when i click on the button to open another window it closes.
Here is my code:
`
public class MainActivity extends AppCompatActivity {
Button b_inscrire_etudiant;
Button b_inscrire_enseignant;
Button b_inscrire_admin;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b_inscrire_etudiant = findViewById(R.id.b_inscrire_etudiant);
b_inscrire_enseignant = findViewById(R.id.b_inscrire_enseignat);
b_inscrire_admin = findViewById(R.id.b_inscrire_admin);
b_inscrire_etudiant.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this , InscriptionEtudiant.class);
startActivity(i);
}
});
b_inscrire_enseignant.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this , InscriptionEnseignant.class);
startActivity(i);
}
});
b_inscrire_admin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(MainActivity.this , InscriptionAdmin.class);
startActivity(i);
}
});
}
}
`
I worked as usual "using Intent" besides it worked well until now.
Here is my Manifest file:
<?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.example.myusto">
<application
android:allowBackup="true"
android:dataExtractionRules="#xml/data_extraction_rules"
android:fullBackupContent="#xml/backup_rules"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/Theme.MyUsto"
tools:targetApi="31">
<activity
android:name=".InscriptionEnseignant"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".InscriptionEtudiant"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".InscriptionAdmin"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".Connexion"
android:exported="false">
<meta-data
android:name="android.app.lib_name"
android:value="" />
</activity>
<activity
android:name=".MainActivity"
android:exported="true">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
ps: I solved the problem, by the way two were missing
Thank you for the answers.
It's true, it was missing a part of the code which was not written in the manifest file
this is my manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.openboot">
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<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=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<receiver android:name=".StartAppOnBoot" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.QUICKBOOT_POWERON" />
</intent-filter>
</receiver>
</application>
</manifest>
My BroadcastReceiver that "receives" the boot completed intent:
public class StartAppOnBoot extends BroadcastReceiver {
#Override
public void onReceive(Context context, Intent intent) {
if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
Intent i = new Intent(context, MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);
}
}
My MainActivity that I need to open:
public class MainActivity extends AppCompatActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
I need MainActivity to open when the phone turns on, but I don't see the way to do it.
public class MainActivity extends AppCompatActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new
Intent(getApplicationContext,StartAppOnBoot.class);
sendBroadcast(intent);
}
reference
https://developer.android.com/guide/components/broadcasts#java
I have imported a package which was downloaded from the link "https://github.com/moritz-wundke/android-page-curl", then I created a new project and imported the downloaded package by clicking on "import module". I have added a button inside my new package to open the downloaded package. But its not working. Can someone help. Here is the code
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i;
PackageManager manager = getPackageManager();
try {
i = manager.getLaunchIntentForPackage
("fi.harism.curl");
if (i == null)
throw new PackageManager.NameNotFoundException();
i.addCategory(Intent.CATEGORY_LAUNCHER);
startActivity(i);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
}
});
}
Manifest:
<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"
tools:replace="android:icon">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
Layout:
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/button"
android:text="press"/>
I have a button on main activity which onclick is supposed to start a activity
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButtonClick(View v){
if(v.getId()==R.id.lbutton)
{
Intent i = new Intent(MainActivity.this,Display.class);
startActivity(i);
}
}
}
lbutton is the id of button
Display.java
public class Display extends Activity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondsc);
}
}
secondsc.xml is a layout file which contains content for the new activity
Manifest.xml
<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>
<activity android:name=".Display">
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
remove intent-filter to DisplayActivity in your manifest file:
<intent-filter>
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
And register your clickListener button
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.lbutton).setOnClickLIstener(new OnClickLIstener (){
void onClick (View v) {
onButtonClick(v);
}
});
}
You need to add an event listener to the button. You can either implement the View.OnClickListener interface and implement the onClick method (good if you have multiple buttons that need listeners), or use an anonymous class:
btn.setOnClickListener(new View.OnClickListener() {
onClick (View v) {
}
}
Are you sure that the OnButtonClick is being executed? I recommend doing it this way:
Button lButton = (Button) findViewById(R.id.lButton);
lButton.setOnClickListener(new OnClickListener() {
onClick(View view) {
Intent i = new Intent(MainActivity.this,Display.class);
startActivity(i);
}
}
-Daniel
then when i press f8 a i get : ZygoteInit$methodandargscaller.run() source not found
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.copyup"
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.copyup.MainActivity"
android:label="copy up" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Game"
android:label="Copy Up">
</activity>
<activity
android:name=".Rules"
android:label="Copy Up!">
</activity>
<activity
android:name=".Scores"
android:label="Copy Up!">
</activity>
<activity
android:name=".LearnCircle"
android:label="Copy Up!">
</activity>
<activity
android:name=".LearnHoriz"
android:label="Copy Up!">
</activity>
<activity
android:name=".LearnVert"
android:label="Copy Up!">
</activity>
<activity
android:name=".LearnMenu"
android:label="Copy Up!">
</activity>
</application>
</manifest>
and my code:
package com.example.copyup;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button start, rules, hs, learn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
linktoxml();
start.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, Game.class);
MainActivity.this.startActivity(myIntent);
}
});
/*
rules.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, Rules.class);
MainActivity.this.startActivity(myIntent);
}
});
hs.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, Scores.class);
MainActivity.this.startActivity(myIntent);
}
});
learn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent myIntent = new Intent(MainActivity.this, LearnMenu.class);
MainActivity.this.startActivity(myIntent);
}
});*/
//show shape, take reading after 4 seconds, compare with other, if true next, if false, end game
//dont make it complex with time reduce yet!!
}
private void linktoxml() {
start = (Button) findViewById(R.id.bcstart);
rules = (Button) findViewById(R.id.brules);
hs = (Button) findViewById(R.id.bhs);
learn = (Button) findViewById(R.id.blearn);
}
}
I have tried cleaning the project, re-writing the manifest and everything i can possible think of. It works if i comment out the links to the buttons in the code and leave them in the manifest but the moment i uncommnet them i get these errors, please help!!!
The problem is that the activity throw exception.
eclipse looks for the source code in android SDK and can't find it.
Just debug your code and find out where the code throw exception.
solved it, feeling pretty stupid now, needed bstart not bcstart when the button is defined.