可能重复：
How to block outgoing calls and texts to contacts (Prevent drunk dialing)
对于我的一个计算机科学课程，我正在制作一个应用程序，以防止人们醉酒拨号。基本上，用户在开始饮酒之前点击一个按钮，这会关闭所有传出呼叫/文本功能，直到他们通过清醒测试（回答数学问题）。当我们按下“开始”按钮直到他们正确地回答问题时，我一直坚持如何阻止呼叫/文本。到目前为止，似乎大多数人都建议使用BroadcastReceiver阻止呼叫，但我认为这不会对我的情况有效，因为当按下“开始”按钮或按下按钮时，无法启动和停止广播接收器输入正确的文字。我错过了什么吗？是否可以使用后台服务来实现这一目标，还是以这种方式使用BroadcastReceiver的好方法？
这是我的代码：
public class MainActivity extends Activity {
int answer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final EditText userInput = (EditText) findViewById(R.id.answerinput);
userInput.setEnabled(false);
//This creates the button object for the "Start Drinking" button
final Button leftbutton = (Button) findViewById(R.id.leftbutton);
//This creates the button object for the "Make Call" button
final Button rightbutton = (Button) findViewById(R.id.rightbutton);
rightbutton.setEnabled(false);
leftbutton.setOnClickListener(new View.OnClickListener() {
/**
* Description: This method listens for a click on the "Make Call" button. Once
* the button is clicked, this method will call other methods in order to create a
* random math problem, display this problem to the user, and check to see if the user
* answered correctly. If they did, then this method will call the dialer to make
* a phone call.
* @author Matt
* @params A view object to see the button
* @return void
* @throws None
*/
public void onClick(View v) {
rightbutton.setEnabled(true);
leftbutton.setEnabled(false);
}
});
rightbutton.setOnClickListener(new View.OnClickListener() {
/**
* Description: This method listens for a click on the "Send Text" button. Once
* the button is clicked, this method will call other methods in order to create a
* random math problem, display this problem to the user, and check to see if the user
* answered correctly. If they did, then this method will call the text messaging service
* to allow the user to send a text.
* @author Matt
* @params A view object to see the button
* @return void
* @throws None
*/
public void onClick(View v) {
answer = createMathProblem();
userInput.setEnabled(true);
}
});
userInput.setOnKeyListener(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
String text = userInput.getText().toString();
// If the event is a key-down event on the "enter" button
if ((event.getAction() == KeyEvent.ACTION_DOWN)
&& (keyCode == KeyEvent.KEYCODE_ENTER)) {
if (matchAnswer(answer, Integer.parseInt(text))) {
leftbutton.setEnabled(true);
rightbutton.setEnabled(false);
userInput.setEnabled(false);
//airplane();
Toast.makeText(MainActivity.this, "Correct!", Toast.LENGTH_LONG).show();
}
return true;
}
return false;
}
});
}
/**
* Description: This method checks to see if the user answered the math problem
* correctly.
* @author Matt
* @params The correct answer to the math problem and the user's input answer
* @return True or false depending on if the user answered correctly
* @throws None
*/
public boolean matchAnswer(int correctAnswer, int userAnswer) {
return (correctAnswer == userAnswer);
}
/**
* Description: This method creates a random math problem for the user to
* answer and displays it to the screen.
* @author Matt
* @params None
* @return The correct answer to the math problem.
* @throws None
*/
public int createMathProblem() {
int random1 = (int) (Math.random() * 100);
int random2 = (int) (Math.random() * 100);
int answer = random1 + random2;
Toast.makeText(MainActivity.this, random1 + " + " + random2 + " = ?", Toast.LENGTH_LONG).show();
return answer;
}
}