android studio实现简单考试应用程序

4.java代码

package com.example.lenovo.zuoye06_231;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.CompoundButton;
public class MainActivity extends AppCompatActivity {
    static int i = 0,cb_num = 0;
    boolean  rd_num = false,sp_num = false,et_num = false;
    TextView sorce;
    TextView et_on;
    RadioGroup rd;
    Button button;
    CheckBox checkBox1;
    CheckBox checkBox2;
    CheckBox checkBox3;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //定义
        et_on = findViewById(R.id.et_on);
        sorce = findViewById(R.id.sorce);
        rd = findViewById(R.id.radioGroup);
        button = findViewById(R.id.button);
        checkBox1 = findViewById(R.id.cb1);
        checkBox2 = findViewById(R.id.cb2);
        checkBox3 = findViewById(R.id.cb3);
        //为每个复选按钮设置状态改变监听器
        checkBox1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked)   cb_num++;
                else    cb_num--;
            }
        });
        checkBox2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked)   cb_num--;
                else    cb_num++;
            }
        });
        checkBox3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener(){
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                if(isChecked)   cb_num++;
                else    cb_num--;
            }
        });
        //设置单选按钮组添加事件监听
        rd.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                //获取被选择的单选按钮
                RadioButton r = (RadioButton) findViewById(checkedId);
                if(r.getText().equals("开源的"))   rd_num = true;
                else    rd_num = false;
            }
        });
        //edittext监听
        et_on.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int i, KeyEvent keyEvent) {
                if(et_on.getText().toString().equals("2007"))   et_num = true;
                else    et_num = false;
                return false;
            }
        });
        //获取下拉列表对象
        final Spinner spinner = (Spinner) findViewById(R.id.spinner);
        //为Spinner添加选择监听器
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            //数据选择事件处理
            public void onItemSelected(AdapterView parent, View view, int pos, long id) {
                String[] Systems = getResources().getStringArray(R.array.Systems);
                //显示选择结果
                if(Systems[pos].equals("Linux"))   sp_num = true;
                else    sp_num = false;
            }
           //以下方法重写必须有
            @Override
            public void onNothingSelected(AdapterView parent) {
                // Another interface callback
            }
        });
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(cb_num == 2) i++;
                if(sp_num)  i++;
                if(et_num)  i++;
                if(rd_num)  i++;
                sorce.setText("         "+(i*25)+"         ");
                if(i == 4)
                    Toast.makeText(MainActivity.this,"你真棒！祝贺你！", Toast.LENGTH_SHORT).show();
                else if(i == 3)
                    Toast.makeText(MainActivity.this,"祝贺你通过考试！", Toast.LENGTH_SHORT).show();
                else
                    Toast.makeText(MainActivity.this,"还需努力啊！", Toast.LENGTH_SHORT).show();
            }
        });
    }
}