Question on radio button beginner level app

Question

Please help me. Whats wrong with the code. The app crashes and I get msg as "app has unfortunately stopped"
package com.example.saurabhb.gettingcolor;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
public class AskColorMainActivity extends ActionBarActivity {
private RadioGroup mainRadioGroup;
private RadioButton radioButtonForRed;
private Button nextButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ask_color_main);

radioButtonForRed = (RadioButton) findViewById(R.id.radioButtonForRed);
    nextButton = (Button) findViewById(R.id.nextButton);

nextButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int forGettingId = mainRadioGroup.getCheckedRadioButtonId();
            radioButtonForRed = (RadioButton) findViewById(forGettingId);
            String forIntent = radioButtonForRed.getText().toString();
            Toast.makeText(AskColorMainActivity.this, forIntent, Toast.LENGTH_LONG).show();
            Intent intent = new Intent(AskColorMainActivity.this, AboutTheColor.class);
            intent.putExtra("colour", forIntent);
            startActivity(intent);
        }
    });
}

}
/// on next activity:
package com.example.saurabhb.gettingcolor;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class AboutTheColor extends ActionBarActivity {
private TextView pageTwoText;
private String lastTimeIntent;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_about_the_color);

Intent intent = getIntent();
    lastTimeIntent = intent.getStringExtra("colour");
    pageTwoText.setText("Hello");

}

Saurabh B · Answer

Yes.... Here it is...
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.view.ViewGroup.onNestedScrollAccepted, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onNestedScrollAccepted
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 12208: Landroid/view/ViewGroup;.onNestedScrollAccepted (Landroid/view/View;Landroid/view/View;I)V
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.view.ViewGroup.onStopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onStopNestedScroll
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 12214: Landroid/view/ViewGroup;.onStopNestedScroll (Landroid/view/View;)V
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.support.v7.internal.widget.ActionBarOverlayLayout.stopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.setHideOnContentScrollEnabled
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 9779: Landroid/support/v7/internal/widget/ActionBarOverlayLayout;.stopNestedScroll ()V
04-24 18:05:46.001  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x000e
04-24 18:05:46.041  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
04-24 18:05:46.041  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 12211: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
04-24 18:05:46.041  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0007
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 393: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 415: Landroid/content/res/TypedArray;.getType (I)I
04-24 18:05:46.051  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawable
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 356: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawableForDensity
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ VFY: unable to resolve virtual method 358: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
04-24 18:05:46.061  19299-19299/com.example.saurabhb.gettingcolor D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
04-24 18:05:47.523  19299-19303/com.example.saurabhb.gettingcolor D/dalvikvm﹕ GCCONCURRENT freed 203K, 11% free 9620K/10759K, paused 117ms+36ms, total 194ms
04-24 18:05:48.374  19299-19299/com.example.saurabhb.gettingcolor D/libEGL﹕ loaded /system/lib/egl/libGLEShawaii.so
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ meminit ++
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ gHwMemAllocator client 3
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ **** Using ION allocator ****
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ registered SIGUSR1[10] for pid[19299]
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ HwMemAllocatorImpl Static Counters 0 0
04-24 18:05:48.394  19299-19299/com.example.saurabhb.gettingcolor D/﹕ HwMemAllocatorImpl[4ad7dd5c] totalDeviceAllocSize[0] totalFree[0] maxFree[0] in numSlabs[0]
04-24 18:05:48.414  19299-19299/com.example.saurabhb.gettingcolor D/﹕ meminit 4ad7dd5c--
04-24 18:05:48.414  19299-19299/com.example.saurabhb.gettingcolor D/ION﹕ config: version(0x10000) secure(0xf000) 256M(0x22d) fast(0x608) hwwr(0x608)
04-24 18:05:48.414  19299-19299/com.example.saurabhb.gettingcolor D/﹕ Waiting for mm thread to come up
04-24 18:05:48.424  19299-19299/com.example.saurabhb.gettingcolor D/﹕ Waiting for mm thread to come up
04-24 18:05:48.424  19299-19338/com.example.saurabhb.gettingcolor D/﹕ mmdevicethread starting
04-24 18:05:48.444  19299-19299/com.example.saurabhb.gettingcolor D/HAWAIIEGL﹕ eglCreateContext() config: 35 context: 0x4cf9f918, VC context 1, Thread 19299
04-24 18:05:48.454  19299-19299/com.example.saurabhb.gettingcolor D/HAWAIIEGL﹕ Set SWAP INTERVAL 0
04-24 18:05:48.454  19299-19299/com.example.saurabhb.gettingcolor D/HAWAIIEGL﹕ eglCreateWindowSurface() surface: 0x4cf9f938, VC surface: 1, Thread: 19299
04-24 18:05:48.454  19299-19299/com.example.saurabhb.gettingcolor D/HAWAIIEGL﹕ eglMakeCurrent(0x4cf9f918, 0x4cf9f938, 0x4cf9f938) Thread: 19299
04-24 18:05:48.474  19299-19299/com.example.saurabhb.gettingcolor D/OpenGLRenderer﹕ Enabling debug mode 0
04-24 18:05:51.757  19299-19299/com.example.saurabhb.gettingcolor D/AndroidRuntime﹕ Shutting down VM
04-24 18:05:51.757  19299-19299/com.example.saurabhb.gettingcolor W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x416c82a0)
04-24 18:05:51.847  19299-19299/com.example.saurabhb.gettingcolor E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.NullPointerException
            at com.example.saurabhb.gettingcolor.AskColorMainActivity$1.onClick(AskColorMainActivity.java:32)
            at android.view.View.performClick(View.java:4275)
            at android.view.View$PerformClick.run(View.java:17434)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:177)
            at android.app.ActivityThread.main(ActivityThread.java:4947)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
            at dalvik.system.NativeStart.main(Native Method)

James Simshaw · Answer

Hello,
In your AboutTheColor class, you call pageTwoText.setText("Hello"); without initializing the pageTwoText TextView variable.  You probably want to use findViewById to initialize pageTwoText.

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Saurabh B

Saurabh B

Question on radio button beginner level app

2 Answers

James Simshaw

James Simshaw

Saurabh B

Saurabh B

James Simshaw

James Simshaw

Saurabh B

Saurabh B

Saurabh B

Saurabh B