报错：The method setOnClickListener(View.OnClickListener) in the type View is not applicable for the ar

<span style="font-family: CourierNewPS-BoldMT; font-size: 9pt;"></span><pre name="code" class="java">Button button1 = (Button) findViewById(R.id.button_1);button1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Toast.makeText(FirstActivity.this, "You clicked Button 1",Toast.LENGTH_SHORT).show();}});

引入的类不对：
import android.content.DialogInterface.OnClickListener;

应该是View类里面的OnClickListener

import android.view.View.OnClickListener;