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; } }}