Android Studio Button 事件

package com.example.administrator.a3d;
import android.support.v7.app.AppCompatActivity;
import android.widget.Button;
import android.widget.TextView;
import android.widget.EditText;
import android.view.View;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
    private TextView textView1;
    private TextView textView2;
    private EditText editText1;
    private Button button1;
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView1 = (TextView)findViewById(R.id.textView1);
        textView2 = (TextView)findViewById(R.id.textView2);
        editText1 = (EditText)findViewById(R.id.editText1);
        button1 = (Button)findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v)
            {
                if("1".equals(editText1.getText().toString().trim()))
                {
                  textView1.setText("20");
                  textView2.setText("30");
                }
                if("3".equals(editText1.getText().toString().trim()))
                {
                    textView1.setText("25");
                    textView2.setText("35");
                }
            }
        });
    }
}