Question

这是我的onCreate功能。

由于onclickListener中有很多代码用于Hello，我想将它移到一个方法之外。我怎样才能做到这一点？

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        facebook.authorize(this, permissions, Facebook.FORCE_DIALOG_AUTH,
                new DialogListener() {

                    public void onComplete(Bundle values) {
                    }

                    public void onFacebookError(FacebookError error) {
                    }

                    public void onError(DialogError e) {
                    }

                    public void onCancel() {

                    }
                });

        hello = (Button) findViewById(R.id.hello);
        info = (TextView) findViewById(R.id.facebook_info);
        content = (TextView) findViewById(R.id.content);

        hello.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {
                // bundle.putString("fields", "email");
                try {
                    about = facebook.request("me");
                    json = Util.parseJson(about);
                    id = json.getString("id");
                    first_name = json.getString("first_name");
                    last_name = json.getString("last_name");
                    email = json.getString("email");

                    if (!json.isNull("username")) {
                        username = json.getString("username");
                    } else {
                        Log.d("TAG", "Username not set");
                    }

                    dob = json.getString("birthday");
                    gender = json.getString("gender");
                    location = json.getString("location");

                    json_location = Util.parseJson(location);
                    place = json_location.getString("name");

                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (FacebookError e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

                // info.setText(about);
                content.setText(id + " \n" + first_name + " \n" + last_name
                        + " \n" + email + " \n" + username + " \n" + dob
                        + " \n" + gender + " \n" + place);
            }
        });

    }

Answer 1

创建一个扩展OnClickListener的内部类。

private class MyOnClickListener implements OnClickListener { ... }

在这里，您可以为匿名OnClickListener添加完全相同的实现。只需确保您访问的所有变量都在Activity类中声明为局部变量。

然后当您设置onClickListener时，您只需执行此操作：

hello.setOnClickListener( new MyOnCLickListener() );

Answer 2

 public class ClassName extends Activity implements OnClickListener {

    public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);

            facebook.authorize(this, permissions, Facebook.FORCE_DIALOG_AUTH,
                    new DialogListener() {

                        public void onComplete(Bundle values) {
                        }

                        public void onFacebookError(FacebookError error) {
                        }

                        public void onError(DialogError e) {
                        }

                        public void onCancel() {

                        }
                    });

            hello = (Button) findViewById(R.id.hello);
            hello.setOnClickListener(this);
            info = (TextView) findViewById(R.id.facebook_info);
            content = (TextView) findViewById(R.id.content);

        }

    public void onClick(View arg0) {
        if(arg0==hello){
                    try {
                        about = facebook.request("me");
                        json = Util.parseJson(about);
                        id = json.getString("id");
                        first_name = json.getString("first_name");
                        last_name = json.getString("last_name");
                        email = json.getString("email");

                        if (!json.isNull("username")) {
                            username = json.getString("username");
                        } else {
                            Log.d("TAG", "Username not set");
                        }

                        dob = json.getString("birthday");
                        gender = json.getString("gender");
                        location = json.getString("location");

                        json_location = Util.parseJson(location);
                        place = json_location.getString("name");

                    } catch (MalformedURLException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    } catch (JSONException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    } catch (FacebookError e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }

                    // info.setText(about);
                    content.setText(id + " \n" + first_name + " \n" + last_name
                            + " \n" + email + " \n" + username + " \n" + dob
                            + " \n" + gender + " \n" + place);
                }
         }

    }

替换您的代码＆amp;写上面的代码。

Answer 3

将代码放在公共/受保护的函数中。由于onClickListener是你的一个抽象类，它可以从嵌套它的类中访问公共或受保护的方法。

在onCreate之外的Android setClickListner

3 个答案: