安卓View.OnKeyListener：点击一次，执行两次 [英] Android View.OnKeyListener: click once, execute twice

问题描述

可能重复：
  公共布尔onKey（）调用两次？

下面是我的code

public class TestKeyActivity extends Activity {

private int i=1;
private ScrollView sv;
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    sv=(ScrollView) this.findViewById(R.id.read_scrollView);

    sv.setOnKeyListener(new View.OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            if (keyCode == KeyEvent.KEYCODE_DPAD_RIGHT) {

        Toast.makeText(TestKeyActivity.this, "what is wrong！！！！"+(i++), 2).show();
            return true;
            }
            return false;
        }
    });
    }
}

我用他的Andr​​oid模拟器和Eclipse，我不知道为什么，但是当我点击该键一次，code 吐司将执行两次。 是不是有什么毛病我code？

I use he Android emulator and Eclipse，I don't know why, but when I click the key once, the code of toast will execute twice. Is there something wrong with my code?

推荐答案

我只是回答了一个非常类似的问题（<一href="http://stackoverflow.com/questions/10377049/unwilling-edittext-ontouchlistener-function-call/10377470#10377470">here).问题是，你激活的 KeyEvent.ACTION_DOWN 和 KeyEvent.ACTION_UP 。您应该只执行你的code如果 KeyEvent.getAction（）== KeyEvent.ACTION_UP

I just answered a very similar question (here). The problem is that you're activating on KeyEvent.ACTION_DOWN and KeyEvent.ACTION_UP. You should only execute your code if KeyEvent.getAction() == KeyEvent.ACTION_UP

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