Lỗi : UnsupportedOperationException?

Em có làm cái thread Splash Screen mà chạy ứng dụng nó đóng ngay tại chỗ . Đây là LogCat của em :

12-30 21:15:58.493    1559-1593/com.example.zaloao E/AndroidRuntime﹕ FATAL EXCEPTION: Thread-158
java.lang.UnsupportedOperationException
        at java.lang.Thread.stop(Thread.java:1076)
        at java.lang.Thread.stop(Thread.java:1063)
        at com.example.zaloao.MainActivity$1.run(MainActivity.java:38)
12-30 21:15:58.549    1559-1559/com.example.zaloao W/EGL_genymotion﹕ eglSurfaceAttrib not implemented
12-30 21:15:59.105    1559-1559/com.example.zaloao D/OpenGLRenderer﹕ TextureCache::flush: target size: 445327
12-30 21:15:59.105    1559-1559/com.example.zaloao D/OpenGLRenderer﹕ TextureCache::callback: name, removed size, mSize = 1, 739908, 2304

Đây là phần Java code:

package com.example.zaloao;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;

public class MainActivity extends ActionBarActivity {
    protected boolean _active = true;
    protected int _splashTime = 5000;

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

        Thread splashTread = new Thread() {
            @Override
            public void run() {
                try {
                    int waited = 0;
                    while(_active && (waited < _splashTime)) {
                        sleep(100);
                        if(_active) {
                            waited += 100;
                        }
                    }
                } catch(InterruptedException e) {
                    // do nothing
                } finally {
                    finish();
                    Intent mainIntent = new Intent(MainActivity.this, Welcome.class);
                    MainActivity.this.startActivity(mainIntent);
                    MainActivity.this.finish();
                    stop();
                }
            }
        };
        splashTread.start();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            _active = false;
        }
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Đây là phần code xml :

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/img_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/main_welcome"
        />

</LinearLayout>

Ai đi qua xem dùm em với nha .