安卓小项目，课程设计，课设，刷题app

一、需求分析：

如今考驾照已经成为了很多人的刚需，对于科目1与科目4来说，大量的刷题必不可少。
根据市场需求，我们开发了一个可以在手机刷题的app方便人们随时随地地刷题。

二、部分代码

public class Main3Activity extends AppCompatActivity {
    private Sql sql;
    int jub = 1;
    String ans=null;
    String anal=null;
    String type=null;
    int id;
    String topic;
    String a;
    String b;
    String c;
    String d;
    String img;
    boolean boo=true;
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main3);
        Intent getI = getIntent();
        final Bundle data = getI.getExtras();
        type= data.getString("data");

        replace(jub);

        Button btnUp = findViewById(R.id.btnUp);  //上一题按钮
        btnUp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (jub>=2){
                    jub--;
                    replace(jub);
                }

            }
        });

        Button btnDown = findViewById(R.id.btnDown);  //下一题按钮
        btnDown.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                jub++;
                replace(jub);
                RadioGroup radioGroup2 = findViewById(R.id.radioGroup2);
                radioGroup2.check(-1);
            }
        });

        Button btnCol = findViewById(R.id.btnCol);
        if(!type.equals("col")){
          btnCol.setText("加入错题");
        }else {
           btnCol.setText("删除");
            //btnCol.setText(type);
        }
        btnCol.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(!type.equals("col")){
                    SQLiteDatabase db = sql.getWritableDatabase();
                    Cursor cursor = db.query(true, "col",null,"id = "+id,null,null,null,null,null);
                    if (cursor.getCount()==1){
                        Toast toast=Toast.makeText(getApplicationContext(), "已经加入", Toast.LENGTH_SHORT);
                        toast.show();
                    }else {
                        int num;
                        Cursor cur = db.rawQuery("select * from col", null);
                        num=cur.getCount();
                        if(cur.moveToFirst()){
                            int frist=cur.getInt(cur.getColumnIndex("id"));
                            if (frist!=1){
                                num=num+frist;
                            }else {
                                num++;
                            }
                        }
                        if (num==0)num++;
                        ContentValues contentValues = new ContentValues();
                        contentValues.put("id",num);
                        contentValues.put("type",type);
                        contentValues.put("topic",topic);
                        contentValues.put("a",a);
                        contentValues.put("b",b);
                        contentValues.put("c",c);
                        contentValues.put("d",d);
                        contentValues.put("answer",ans);
                        contentValues.put("analyse",anal);
                        contentValues.put("img",img);
                        db.insert("col",null,contentValues);
                        Toast toast=Toast.makeText(getApplicationContext(), "加入成功", Toast.LENGTH_SHORT);
                        toast.show();
                    }
                }else {
                SQLiteDatabase db = sql.getWritableDatabase();
                Cursor cursor = db.query(true, type,null,"id = "+id,null,null,null,null,null);
                     if (cursor.getCount()==1){
                         db.delete("col","id=?",new String[]{String.valueOf(id)});
                         Toast toast=Toast.makeText(getApplicationContext(), "删除成功", Toast.LENGTH_SHORT);
                         toast.show();
                      }else {
                         Toast toast=Toast.makeText(getApplicationContext(), "已经删除", Toast.LENGTH_SHORT);
                         toast.show();
                     }


                }
            }
        });

三、相关截图

源码请+q:2538966470

本文地址：https://blog.csdn.net/weixin_45702159/article/details/107877828