The question:
In my Android application, I have two activity classes. I have a button on the first one and I want to show the second when it is clicked, but I get an error. Here are the classes:
public class FirstActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button orderButton = (Button)findViewById(R.id.order);
orderButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(FirstActivity.this, OrderScreen.class);
startActivity(intent);
}
});
}
}
The second class that should show when the button is clicked, but never does:
public class OrderScreen extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.order);
Button orderButton = (Button) findViewById(R.id.end);
orderButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
finish();
}
});
}
}
How do I create a button that will show the second activity?
The Solutions:
Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.
Method 1
The issue was the OrderScreen Activity wasn’t added to the AndroidManifest.xml. Once I added that as an application node, it worked properly.
<activity android:name=".OrderScreen" />
Method 2
Add this line to your AndroidManifest.xml:
<activity android:name=".OrderScreen" />
Method 3
—-FirstActivity.java—–
package com.mindscripts.eid;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class FirstActivity extends Activity {
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button orderButton = (Button) findViewById(R.id.order);
orderButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(FirstActivity.this,OrderScreen.class);
startActivity(intent);
}
});
}
}
—OrderScreen.java—
package com.mindscripts.eid;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class OrderScreen extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second_class);
Button orderButton = (Button) findViewById(R.id.end);
orderButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
finish();
}
});
}
}
—AndroidManifest.xml—-
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mindscripts.eid"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".FirstActivity"
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=".OrderScreen"></activity>
</application>
Method 4
Use this code:
Intent intent=new Intent(context,SecondActivty.class);
startActivity(intent);
finish();
context: refer to current activity context,
please make sure that you have added activity in android manifest file.
Following code for adding activity in android manifest file
<Activity name=".SecondActivity">
</Activity>
Method 5
<activity android:name="[packagename optional].ActivityClassName"></activity>
Simply adding the activity which we want to switch to should be placed in the manifest file
Method 6
When you create any activity in android file you have to specify it in AndroidManifest.xml like
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".MyCreativityActivity"
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=".OrderScreen"></activity>
</application>
Method 7
b1 = (Button) findViewById(R.id.click_me);
b1.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent i = new Intent(MainActivity.this, SecondActivity.class);
startActivity(i);
}
});
Method 8
add the activity in your manifest file
<activity android:name=".OrderScreen" />
Method 9
In the Manifest
<activity android:name=".OrderScreen" />
In the Java Code where you have to place intent code
startActivity(new Intent(CurrentActivity.this, OrderScreen.class);
Method 10
you can use the context of the view that did the calling.
Example:
Button orderButton = (Button)findViewById(R.id.order);
orderButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(/*FirstActivity.this*/ view.getContext(), OrderScreen.class);
startActivity(intent);
}
});
Method 11
Intent i = new Intent("com.Android.SubActivity");
startActivity(i);
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0