随机生成的UUID数字

利用UUID生成完全不重复的数字 package com.example.uuid; import java.util.UUID; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.TextView; public class MainActivity extends Activity implements OnClickListener { private TextView tv; private Button button1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button1 = (Button) findViewById(R.id.button1); tv = (TextView) findViewById(R.id.tv); button1.setOnClickListener(this); UUID uuid = UUID.randomUUID(); tv.setText(uuid.toString()); } @Override public void onClick(View v) { UUID uuid = UUID.randomUUID(); tv.setText(uuid.toString()); } }