runOnUiThread在子进程中更新主进程UI

package com.pingyijinren.test;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
    private Button button;
    private TextView textView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        button=(Button)findViewById(R.id.button);
        textView=(TextView)findViewById(R.id.textView);
 
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try{
                            Thread.sleep(10000);
                        }
                        catch(Exception e){
                            e.printStackTrace();
                        }
 
                        MainActivity.this.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                textView.setText("我已经被子进程更新啦 哈哈");
                            }
                        });
 
                    }
                }).start();
            }
        });
    }
}