我正在制作一个数学应用程序。我有两个数组的两个数组。我让应用程序从每个数组中选择一个随机数。该应用程序在TextView
中显示两个数字。它要求用户输入一个EditText
这个数字的加法是什么。然后,当用户按下“提交”时,应用程序会告诉用户他们是对还是错。检查EditText是否为空
该应用程序的工作原理,但我有一个主要问题。如果用户没有在EditText
中输入任何内容并按下“提交”,则应用程序部队将关闭。我看了其他问题,询问如何检查EditText
是否为空。我尝试了不同的方法,但它仍然不起作用。
public class MainActivity extends Activity {
Button submitb, startb, idkb;
EditText et;
TextView tv, rig, wron;
int arrone[] = { 24, 54, 78, 96, 48, 65, 32, 45, 95, 13, 41, 55, 33, 22,
71, 5, 22, 17, 13, 29, 63, 72, 14, 81, 7 }; // One Set of Numbers//
int arrtwo[] = { 121, 132, 147, 79, 82, 723, 324, 751, 423, 454, 448,
524, 512, 852, 845, 485, 775, 186, 99 }; // Another set of Numbers//
int random1, random2, add;
int wrong = 0;
int right = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list();
startb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int num = (int) (Math.random() * 25);
int mun = (int) (Math.random() * 19);
random1 = arrone[num];
random2 = arrtwo[mun];
String yu = (random1 + " + " + random2 + " =");
tv.setText(yu);
et.setHint("");
idkb.setVisibility(0);
startb.setText("Next Question");
}
});
startb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int bread2 = 0;
if (bread2 == 0) {
Toast.makeText(getApplicationContext(),
"You didn't answer the question!",
Toast.LENGTH_LONG).show();
}
int swag = random1 + random2;
String bread = et.getText().toString();
bread2 = Integer.parseInt(bread);
if (bread2 == swag) {
startb.setText("Next Question");
tv.setText("Correct");
et.setText("");
et.setHint("Click Next Question");
right++;
rig.setText("Right:" + right);
rig.setTextColor(Color.parseColor("#14df11"));
bread2 = 0;
}
else if (bread2 == 0) {
tv.setText("Wrong, the correct answer is " + swag + ".");
startb.setText("Next Question");
et.setText("");
tv.setHint("Click Next Question");
wrong++;
wron.setText("Wrong:" + wrong);
wron.setTextColor(Color.parseColor("#ff0000"));
bread2 = 0;
}
else {
tv.setText("Wrong, the correct answer is " + swag + ".");
startb.setText("Next Question");
et.setText("");
et.setHint("Click Next Question");
wrong++;
wron.setText("Wrong:" + wrong);
wron.setTextColor(Color.parseColor("#ff0000"));
bread2 = 0;
}
}
});
idkb.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int swag = random1 + random2;
tv.setText("The Correct Answer is " + swag + ".");
et.setText("");
tv.setHint("Click Next Question");
wrong++;
wron.setText("Wrong:" + wrong);
wron.setTextColor(Color.parseColor("#ff0000"));
}
});
}
private void list() {
submitb = (Button) findViewById(R.id.b1);
startb = (Button) findViewById(R.id.b2);
et = (EditText) findViewById(R.id.et1);
tv = (TextView) findViewById(R.id.tv1);
rig = (TextView) findViewById(R.id.rtv);
wron = (TextView) findViewById(R.id.wtv);
idkb = (Button) findViewById(R.id.idk);
}
包括从接近 – Daenyth
堆栈跟踪你有没有添加了任何逻辑来检查空或空状态。发布,以及。 –
没有人使用'trim()'从末端移除空格???? –