Android-3

九宫格抽奖

package com.example.nine;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.w3c.dom.Text;

import java.lang.reflect.Array;
import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //引入组件
        final Button b1 = (Button)findViewById(R.id.b1);
        final Button b2 = (Button)findViewById(R.id.b2);
        final Button b3 = (Button)findViewById(R.id.b3);
        final Button b4 = (Button)findViewById(R.id.b4);
        final Button b5 = (Button)findViewById(R.id.b5);
        final Button b6 = (Button)findViewById(R.id.b6);
        final Button b7 = (Button)findViewById(R.id.b7);
        final Button b8 = (Button)findViewById(R.id.b8);
        final Button b9 = (Button)findViewById(R.id.b9);
        final TextView t1 = (TextView)findViewById(R.id.text);
        //设置监听
        b1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                //点击事件执行，同时关闭其余按钮
                t1.setText("恭喜你中奖了！");
                b1.setText("100元");
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setText("HUAWEI");
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setText("xiaomi");
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setText("1角");
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setText("ipad");
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setText("AKW");
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setText("M416");
                b8.setClickable(false);
                b9.setClickable(false);
            }
        });
        b8.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("很遗憾，你没有中奖！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setText("谢谢惠顾");
                b9.setClickable(false);
            }
        });
        b9.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                t1.setText("恭喜你中奖了！");
                b1.setClickable(false);
                b2.setClickable(false);
                b3.setClickable(false);
                b4.setClickable(false);
                b5.setClickable(false);
                b6.setClickable(false);
                b7.setClickable(false);
                b8.setClickable(false);
                b9.setText("笑口常开");
            }
        });
    }
}

代码运行截图

 Component Tree

应用登陆界面代码

package com.example.homework2;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button blogin = (Button)findViewById(R.id.enter);//先引用组件，然后执行算法
        blogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String user = "zhangsan";
                String password = "123456";
                EditText u = (EditText)findViewById(R.id.etname);
                EditText p = (EditText)findViewById(R.id.etpass);
                if (u.getText().toString().equals(user)){//判断用户名是否正确
                    //读取文本信息，转为字符串，判断正确
                    if (p.getText().toString().equals(password)){
　　　　　　　　　　　　　　　　//消息提示
                        Toast.makeText(MainActivity.this, "登陆成功", Toast.LENGTH_LONG).show();
                    }else{
                        //密码输入错误
                        Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_LONG).show();
                    }
                }else{
                    //用户名错误提示
                    Toast.makeText(MainActivity.this, "用户名错误", Toast.LENGTH_LONG).show();
                }
            }
        });
    }
}

代码未实现记住密码与忘记密码选项，初始用户名为：zhangsan，初始密码为：123456.

代码运行截图

 Component Tree 截图