android程序

/*activity_main.xml--------------------------------------------*/
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:background="#00BBFF"
    >

    <EditText
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:id="@+id/et_id"
        android:inputType="none"
        android:layout_margin="10px"
        android:hint="please input your expect money"/>

    <Button
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="点击一下加1元"
        android:id="@+id/btn_id"
        android:layout_margin="10px"/>

    <Button
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:text="点击一下减1元"
        android:id="@+id/btn1_id"
        android:layout_margin="10px"
        />

    <TextView
        android:text="我通过点击鼠标赚了..."
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/tv_id"
        android:textColor="#0000FF"
        android:textSize="20dp"
        android:layout_gravity="center"
        android:layout_margin="10px"/>
</LinearLayout>

/*MainActivity.java--------------------------------------------*/
package com.example.administrator.helloworld;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ActionBarActivity {
    private Button btn;
    private TextView tv;
    private int money = 0;
    private  Button btn1;
    private EditText et;

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

        btn = (Button)findViewById(R.id.btn_id);
        tv = (TextView)findViewById(R.id.tv_id);
        btn1 = (Button)findViewById(R.id.btn1_id);
        et = (EditText)findViewById(R.id.et_id);

        btn.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                int etmoney = Integer.parseInt(et.getText().toString().trim());
                if(etmoney == money)
                    Toast.makeText(MainActivity.this,"success",Toast.LENGTH_SHORT).show();
                money++;
                tv.setText("earn"+money+"dollor");
            }
        });

        btn1.setOnClickListener(new View.OnClickListener(){
            public void onClick(View v) {
                if(money == 0)
                    Toast.makeText(MainActivity.this,"error",Toast.LENGTH_SHORT).show();
                else {
                    money--;
                    tv.setText("earn"+money+"dollor");
                }
            }
        });
    }
 }