android Charset.availableCharsets() crash test

And_charset_comparisonActivity.java

package kr.pe.kingori.exp.charset;

import java.nio.charset.Charset;
import java.util.concurrent.atomic.AtomicInteger;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

public class And_charset_comparisonActivity extends Activity {
	private static final String LOG_TAG = "charset";
	Handler handler = new Handler();
	AtomicInteger count = new AtomicInteger(1);

	Runnable charsetRunnable = new Runnable() {
		@Override
		public void run() {
			try {
				Log.d(LOG_TAG, "And_charset_comparisonActivity.run: " + count.incrementAndGet());
				Charset.availableCharsets();
			} catch (Throwable e) {
				Log.w("log", "And_charset_comparisonActivity.AvailableCharsetRunnable.run:", e);
			}
		}
	};

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		checkTime();
	}

	private void checkTime() {
		long startTime = System.nanoTime();
		for (int i = 0; i < 10; i++) {
			Charset.availableCharsets();
		}
		long endTime = System.nanoTime();
		((TextView) findViewById(R.id.time_result)).setText(Long.toString((endTime - startTime) / 1000 / 1000));
	}

	public void onExecuteThreads(View v) {
		for (int i = 0; i < 5; i++) {
			new Thread(charsetRunnable).start();
		}

		handler.postDelayed(new Runnable() {
			@Override
			public void run() {
				onExecuteThreads(null);
			}
		}, 500);

	}

}

main.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" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Charset.availableCharsets() * 10 times"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/time_result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/thread_run"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Run"
        android:onClick="onExecuteThreads" />
    
</LinearLayout>