簡單的Android四則運算

佈局界面:java

 

佈局界面的代碼:dom

 

java代碼:ide

  點擊按鈕答案時顯示答案:
public class MainActivity extends AppCompatActivity {
private int a,b,c,ty;
private TextView tv;
private Button show,next;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv=(TextView)findViewById(R.id.textView2);
show = (Button)findViewById(R.id.button1);
next = (Button)findViewById(R.id.button2);
sz();
sw();
//點擊答案按鈕時顯示答案
show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
switch (ty) {
case 0:
tv.setText(a + "+" + b + "=" + (a + b));
break;
case 1:
tv.setText(a + "-" + b + "=" + (a - b));
break;
case 2:
tv.setText(a + "+" + b +"*"+ c + "="+ (a+b*c));
break;
case 3:
tv.setText(a + "+" + b +"/"+ c + "="+(a+b/c));
break;
case 4:
tv.setText(a + "-" + b +"*"+ c + "="+(a-b*c));
break;
case 5:
tv.setText(a + "-" + b +"/"+ c + "="+(a-b/c));
break;
case 6:
tv.setText(a + "*" + b + "=" + (a*b));
break;
case 7:
tv.setText(a + "/" + b + "=" + (a/b));
break;
}
}
});

 

  點擊顯示下一題:佈局

//點擊下題
next.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
sz();
sw();
}
});
}

  生成隨機數:spa

//生成隨機數
private void sz(){
Random random = new Random();
random.nextInt();
a = random.nextInt(100);
b = random.nextInt(100);
c = random.nextInt(100);
ty = random.nextInt(8);
}

  顯示題目:blog

 //顯示題目    private void sw(){        switch (ty) {            case 0:                tv.setText(a + "+" + b + "=" + "?");                break;            case 1:                tv.setText(a + "-" + b + "=" + "?");                break;            case 2:                tv.setText(a + "+" + b +"*"+ c + "=" + "?");                break;            case 3:                tv.setText(a + "+" + b +"/"+ c + "=" + "?");                break;            case 4:                tv.setText(a + "-" + b +"*"+ c + "=" + "?");                break;            case 5:                tv.setText(a + "-" + b +"/"+ c + "=" + "?");                break;            case 6:                tv.setText(a + "*" + b + "=" + "?");                break;            case 7:                tv.setText(a + "/" + b + "=" + "?");                break;        }    }}
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