Custom PreferenceScreen with clickable buttons

Question

I have created following Custom Preference Screen.

I want to add Listener on Button1 and Button2. How should I do it?

I am using following code for creating above Preference Screen.

DemoPref:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;

public class DemoPref extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startActivity(new Intent(this, MyPref.class));
    }
} 

MyPref:

import android.os.Bundle;
import android.preference.PreferenceActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MyPref extends PreferenceActivity{
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        //setContentView(R.layout.tftp_setting);
        this.addPreferencesFromResource(R.xml.list_pref);
        /*Button b1 = (Button)findViewById(R.id.button1);
        b1.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {

                Log.i("MyPref", "Button1 one is clicked.");
            }           
        });

        Button b2 = (Button)findViewById(R.id.button2);
        b2.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {

                Log.i("MyPref", "Button2 one is clicked.");
            }           
        });*/
    }
}

res\layout\setting.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
   android:orientation="vertical"
  >
  <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">

    <TextView android:text="TextView1" android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    <EditText android:text="EditText2" android:id="@+id/editText1" android:layout_width="wrap_content" android:layout_height="wrap_content"></EditText>

  </LinearLayout>

  <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">

    <TextView android:text="TextView2" android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    <EditText android:text="EditText2" android:id="@+id/editText2" android:layout_height="wrap_content" android:layout_width="wrap_content"></EditText>

  </LinearLayout>

   <LinearLayout  android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">

    <Button android:text="Button1" android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>
    <Button android:text="Button2" android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content"></Button>

   </LinearLayout>
</LinearLayout>

res\xml\pref.xml:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen
  xmlns:android="http://schemas.android.com/apk/res/android">

 <PreferenceScreen  android:title="My Setting"  android:layout="@layout/setting" android:summary="This is my setting."></PreferenceScreen>

</PreferenceScreen>

Misbehavior

Answer 1

You need:

Button b1 = (Button) findViewById(R.id.button1);
Button b2 = (Button) findViewById(R.id.button2);

b1.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Log.i("MyPref", "Button1 one is clicked.");
    }
});

b2.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Log.i("MyPref", "Button2 one is clicked.");
    }
});

Haven

i have already tried but it is throwing null pointer exception. because of that i added set content view but it is also throwing exception – Misbehavior

@Override is just a compiler hint and does not affect the compiled code – Embracery

Answer 2

I don't have an answer but have some insight -

The view in which you are trying to find the buttons is NOT settings.xml (or pref.xml) - that's why findViewById returns null.

I think the view (layout) which is loaded is internal Android OS view, with ID 17367111 (or 0x1090047).

The only preference you have in the PreferenceScreen you open is another PreferenceScreen (which uses the settings.xml as layout)

you need to get access to the view of this internal PreferenceScreen and them you'd be able to do:

prefScreeView.findViewByID(R.id.button1);

Hope it helps someone to find the answer.

Wyly

Answer 3

Button btn = (Button) getPreferenceScreen().findPreference(key);

Whensoever

can not cast preference to button – Misbehavior