Android的OnClickListener - 识别按钮 [英] Android OnClickListener - identify a button

问题描述

public class Mtest extends Activity {
  Button b1;
  Button b2;
  public void onCreate(Bundle savedInstanceState) {
    ...
    b1 = (Button) findViewById(R.id.b1);
    b2 = (Button) findViewById(R.id.b2);
    b1.setOnClickListener(myhandler);
    b2.setOnClickListener(myhandler);
    ...
  }
  View.OnClickListener myhandler = new View.OnClickListener() {
    public void onClick(View v) {
      // MY QUESTION STARTS HERE!!!
      // IF b1 do this
      // IF b2 do this
      // MY QUESTION ENDS HERE!!!
    }
  }
}

我如何检查哪个按钮被点击？

How do I check which button has been clicked?

推荐答案

您将学习的方式来做到这一点，在一个简单的方法，就是：

You will learn the way to do it, in an easy way, is:

public class Mtest extends Activity {
  Button b1;
  Button b2;
  public void onCreate(Bundle savedInstanceState) {
    ...
    b1 = (Button) findViewById(R.id.b1);
    b2 = (Button) findViewById(R.id.b2);
    b1.setOnClickListener(myhandler1);
    b2.setOnClickListener(myhandler2);
    ...
  }
  View.OnClickListener myhandler1 = new View.OnClickListener() {
    public void onClick(View v) {
      // it was the 1st button
    }
  };
  View.OnClickListener myhandler2 = new View.OnClickListener() {
    public void onClick(View v) {
      // it was the 2nd button
    }
  };
}

或者，如果您正在使用只有一个clicklistener，你可以这样做：

Or, if you are working with just one clicklistener, you can do:

View.OnClickListener myOnlyhandler = new View.OnClickListener() {
  public void onClick(View v) {
      switch(v.getId()) {
        case R.id.b1:
          // it was the first button
          break;
        case R.id.b2:
          // it was the second button
          break;
      }
  }
}

虽然，我不建议这样做这种方式，因为你将需要添加一个如果为每次使用按钮。这是很难维持的。

Though, I don't recommend doing it that way since you will have to add an if for each button you use. That's hard to maintain.

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