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Android Build an Interactive Story App (Retired) Intents and Multiple Activities Adding a Second Activity

Saurabh B
PLUS
Saurabh B
Courses Plus Student 2,880 Points

Question on radio button beginner level app

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");

    }



}

2 Answers

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.

Saurabh B
Saurabh B
Courses Plus Student 2,880 Points

Thanks but after doing it also i am facing the same problem:

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);

    pageTwoText = (TextView) findViewById(R.id.pageTwoText);

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

    }



}

Can you post the contents of logcat after the error occurs? That would help in troubleshooting this at this point.

Saurabh B
Saurabh B
Courses Plus Student 2,880 Points

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﹕ GC_CONCURRENT 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/libGLES_hawaii.so 04-24 18:05:48.394 19299-19299/com.example.saurabhb.gettingcolor D/﹕ mem_init ++ 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/﹕ mem_init 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/﹕ mm_device_thread starting 04-24 18:05:48.444 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ eglCreateContext() config: 35 context: 0x4cf9f918, VC context 1, Thread 19299 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ Set SWAP INTERVAL 0 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ eglCreateWindowSurface() surface: 0x4cf9f938, VC surface: 1, Thread: 19299 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ 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)

Saurabh B
PLUS
Saurabh B
Courses Plus Student 2,880 Points

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﹕ GC_CONCURRENT 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/libGLES_hawaii.so 04-24 18:05:48.394 19299-19299/com.example.saurabhb.gettingcolor D/﹕ mem_init ++ 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/﹕ mem_init 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/﹕ mm_device_thread starting 04-24 18:05:48.444 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ eglCreateContext() config: 35 context: 0x4cf9f918, VC context 1, Thread 19299 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ Set SWAP INTERVAL 0 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ eglCreateWindowSurface() surface: 0x4cf9f938, VC surface: 1, Thread: 19299 04-24 18:05:48.454 19299-19299/com.example.saurabhb.gettingcolor D/HAWAII_EGL﹕ 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)