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Asked: 2026-06-16T03:59:29+00:00

I have created extension of the SeekBar class: package com.simplemathgame; import android.content.Context; import android.widget.SeekBar;

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I have created extension of the SeekBar class:

package com.simplemathgame;

import android.content.Context;
import android.widget.SeekBar;
import android.widget.TextView;

public class SeekBarPlus extends SeekBar {
    private TextView numberOfDrills;

    public SeekBarPlus(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public void onStartTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }

    public void onStopTrackingTouch(SeekBar seekBar) {
        // TODO Auto-generated method stub

    }

    public void onProgressChanged(SeekBar seekBar, int progress,
            boolean fromUser) {
        // TODO Auto-generated method stub
        numberOfDrills.setText(progress); 
    }

    public void setTextView(TextView textView){
        numberOfDrills = textView;
    }

}

and here is the xml layout file:

<?xml version="1.0" encoding="utf-8"?>
<TableLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent" 
    android:layout_width="fill_parent"
    android:background="#000044">
    <TableRow 
        android:layout_marginTop="10dp"
        android:gravity="center_vertical" >
        <TextView 
            android:textColor="#FFFFFFFF"
            android:textSize="16sp"
            android:textStyle="bold"
            android:text="Addition Drills:"/>
    </TableRow>
    <TableRow
        android:layout_marginTop="5dp"
         android:gravity="center_vertical" >

        <com.simplemathgame.SeekBarPlus
            android:id="@+id/add_seek_bar"
            android:layout_width="20dp"
            android:max="10" 
            android:layout_weight="0.8"/>
        <TextView 
            android:id="@+id/add_drills_number" 
            android:textColor="#FFFFFFFF"
            android:textSize="16sp"
            android:textStyle="bold"
            android:layout_weight="0.2"
            android:gravity="center_horizontal"
            android:text="0"/>
    </TableRow>
</TableLayout>

Here is the logCat:

12-19 19:52:48.457: D/dalvikvm(335): GC_EXTERNAL_ALLOC freed 46K, 53% free 2546K/5379K, external 1917K/2137K, paused 72ms
12-19 19:52:51.617: D/AndroidRuntime(335): Shutting down VM
12-19 19:52:51.617: W/dalvikvm(335): threadid=1: thread exiting with uncaught exception (group=0x40015560)
12-19 19:52:51.647: E/AndroidRuntime(335): FATAL EXCEPTION: main
12-19 19:52:51.647: E/AndroidRuntime(335): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.simplemathgame/com.simplemathgame.MainActivity}: android.view.InflateException: Binary XML file line #20: Error inflating class com.simplemathgame.SeekBarPlus
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread.access$1500(ActivityThread.java:117)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.os.Looper.loop(Looper.java:123)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread.main(ActivityThread.java:3683)
12-19 19:52:51.647: E/AndroidRuntime(335):  at java.lang.reflect.Method.invokeNative(Native Method)
12-19 19:52:51.647: E/AndroidRuntime(335):  at java.lang.reflect.Method.invoke(Method.java:507)
12-19 19:52:51.647: E/AndroidRuntime(335):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
12-19 19:52:51.647: E/AndroidRuntime(335):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
12-19 19:52:51.647: E/AndroidRuntime(335):  at dalvik.system.NativeStart.main(Native Method)
12-19 19:52:51.647: E/AndroidRuntime(335): Caused by: android.view.InflateException: Binary XML file line #20: Error inflating class com.simplemathgame.SeekBarPlus
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.createView(LayoutInflater.java:508)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:626)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
12-19 19:52:51.647: E/AndroidRuntime(335):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.Activity.setContentView(Activity.java:1657)
12-19 19:52:51.647: E/AndroidRuntime(335):  at com.simplemathgame.MainActivity.onCreate(MainActivity.java:16)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
12-19 19:52:51.647: E/AndroidRuntime(335):  ... 11 more
12-19 19:52:51.647: E/AndroidRuntime(335): Caused by: java.lang.NoSuchMethodException: SeekBarPlus(Context,AttributeSet)
12-19 19:52:51.647: E/AndroidRuntime(335):  at java.lang.Class.getMatchingConstructor(Class.java:643)
12-19 19:52:51.647: E/AndroidRuntime(335):  at java.lang.Class.getConstructor(Class.java:472)
12-19 19:52:51.647: E/AndroidRuntime(335):  at android.view.LayoutInflater.createView(LayoutInflater.java:480)
12-19 19:52:51.647: E/AndroidRuntime(335):  ... 22 more

I see there is a problem with the extended SeekBarPlus class, But don’t really know why. Thanks!

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1 Answer

  1. Editorial Team

    You haven’t specified full set of constructors in your custom view class. In your particular case, SeekBarPlus(Context,AttributeSet) constructor is missing.

    Custom view class needs to have these 3 constructors:

    public SeekBarPlus(Context context) {
    super(context);
}

public SeekBarPlus(Context context, AttributeSet attrs) {
    super(context, attrs);
}

public SeekBarPlus(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
}

    If you don’t need them, just call super() as shown above.

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