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Editorial Team
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Asked: 2026-06-08T21:52:30+00:00

I try to save the toggle state in my application.Here is my code boolean

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I try to save the toggle state in my application.Here is my code

    boolean on;
public SharedPreferences spref;
ToggleButton tb;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.fb_intermidiate);
    spref = getPreferences(MODE_PRIVATE);
    tb = (ToggleButton) findViewById(R.id.toggleButton1);
    on = spref.getBoolean("On", true);  //default is true
    if (on = true) 
    {
      tb.setChecked(true);
    }       else
    {
      tb.setChecked(false);
    }
    back = (Button)findViewById(R.id.button_back); 
    //back.setText(R.string.back_button_in_settings);
    back.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            finish();
        }
    }); 
} 

public void onToggleClicked(View view) {

    on = ((ToggleButton) view).isChecked();
    if (on) {
        Toast.makeText(this, "On : Notification will be Enabled", Toast.LENGTH_SHORT).show();
        SharedPreferences.Editor editor = spref.edit();
        editor.putBoolean("On", true); // value to store
        editor.commit();

    } else {
    Toast.makeText(this, "Off : Notification will be Disabled", Toast.LENGTH_SHORT).show();
        SharedPreferences.Editor editor =spref.edit();
        editor.putBoolean("Off", false); // value to store
        editor.commit();
    }  
}

But Its getting force close.:(

Here is my logcat

07-25 09:02:23.317: E/AndroidRuntime(640): java.lang.RuntimeException: Unable to start       activity ComponentInfo{com.ace.gugulog/com.ace.gugulog.activities.FacebookIntermidiate}: java.lang.NullPointerException

07-25 09:02:23.317: E/AndroidRuntime(640):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)

07-25 09:02:23.317: E/AndroidRuntime(640):  at java.lang.reflect.Method.invokeNative(Native Method)

07-25 09:02:23.317: E/AndroidRuntime(640):  at java.lang.reflect.Method.invoke(Method.java:491)

07-25 09:02:23.317: E/AndroidRuntime(640):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)

07-25 09:02:23.317: E/AndroidRuntime(640):  at dalvik.system.NativeStart.main(Native Method)
07-25 09:02:23.317: E/AndroidRuntime(640): Caused by: java.lang.NullPointerException

07-25 09:02:23.317: E/AndroidRuntime(640):  at  com.ace.gugulog.activities.FacebookIntermidiate.onCreate(FacebookIntermidiate.java:32)

07-25 09:02:23.317: E/AndroidRuntime(640):  at android.app.Activity.performCreate(Activity.java:4397)

07-25 09:02:23.317: E/AndroidRuntime(640):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
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1 Answer

  1. Editorial Team

    I think most likely source of error is, you are not using shared preferencces properly, change your code to: you should use getSharedPreferences instead of getPreferences method.

      boolean on;
public SharedPreferences spref;
final String PREF_NAME="preferences";
ToggleButton tb;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.fb_intermidiate);
    spref = getSharedPreferences(PREF_NAME, MODE_PRIVATE);
    tb = (ToggleButton) findViewById(R.id.toggleButton1);
    on = spref.getBoolean("On", true);  //default is true
    if (on = true) 
    {
      tb.setChecked(true);
    }       else
    {
      tb.setChecked(false);
    }
    back = (Button)findViewById(R.id.button_back); 
    //back.setText(R.string.back_button_in_settings);
    back.setOnClickListener(new View.OnClickListener() {

        public void onClick(View v) {
            // TODO Auto-generated method stub
            finish();
        }
    }); 
} 

public void onToggleClicked(View view) {

    on = ((ToggleButton) view).isChecked();
    if (on) {
        Toast.makeText(this, "On : Notification will be Enabled", Toast.LENGTH_SHORT).show();
        SharedPreferences.Editor editor = spref.edit();
        editor.putBoolean("On", true); // value to store
        editor.commit();

    } else {
    Toast.makeText(this, "Off : Notification will be Disabled", Toast.LENGTH_SHORT).show();
        SharedPreferences.Editor editor =spref.edit();
        editor.putBoolean("Off", false); // value to store
        editor.commit();
    }  
}
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