Question

在让2个按钮工作时遇到一些麻烦。

在下面的屏幕截图中，我制作了两个名为NEXT＆amp;的按钮。背部。这些按钮允许用户将其从第1周更改为第3周。当他们单击“下一步”并到达“周”时，我需要禁用该按钮，并且不允许它们继续进行，因为它最多只有3周。同样的事情是BACK按钮和骑自行车到达第1周。参见下面的代码。

http://i.stack.imgur.com/fLazK.jpg

import android.content.Intent;
import android.content.SharedPreferences;
import android.media.Image;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;

public class MainActivity extends FragmentActivity {

    final String PREFS_NAME = "MyPrefs";
    ViewPager viewPager;
    String week1 = "1";
    String week2 = "2";
    String week3 = "3";
    private int[] weekNumbers = {1, 2, 3};
    int weekNumberCounter = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Casting variables

        viewPager = (ViewPager) findViewById(R.id.pager);
        viewPager.setAdapter(new MyAdapter(getSupportFragmentManager()));

        //////// First startup screen after first time use
        SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
        if (settings.getBoolean("my_first_time", true)) {


            Intent VirginBoot = new Intent(this, Begin_Program.class);
            startActivity(VirginBoot);

            // Record the fact that the app has been started at least once
            settings.edit().putBoolean("my_first_time", false).apply();
        }
    }


    public void settingsButton(View view) {

        Intent i = new Intent(this, Settings.class);
        startActivity(i);
    }


    public void NextWeek(View view) {
        int weekCounter = 0;
        TextView weekNumber = (TextView) findViewById(R.id.week_number_text);
        ImageButton LastWeekButton = (ImageButton) findViewById(R.id.LastWeek);
        ImageButton NextWeekButton = (ImageButton) findViewById(R.id.NextWeek);

        switch (view.getId()) {
            case R.id.NextWeek:

                if (weekCounter < (weekNumbers.length) - 2) {
                    weekCounter++;
                    weekNumber.setText(week2);


                    if (weekCounter == (weekNumbers.length) - 1) {

                        weekNumber.setText(week3);
                        LastWeekButton.setClickable(true);
                        NextWeekButton.setClickable(false);
                    }
                }


            case R.id.LastWeek:
                if (weekCounter > weekNumbers.length) {
                    weekCounter--;
                    weekNumber.setText(week2);

                    if (weekCounter == (weekNumbers.length) - 1) {
                        weekNumber.setText(week1);
                        NextWeekButton.setClickable(true);
                        LastWeekButton.setClickable(false);
                    }
                }
                break;


        }


    }


    class MyAdapter extends FragmentPagerAdapter {
        public MyAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int arg0) {
            Fragment fragment = null;
            if (arg0 == 0) {
                fragment = new Day_1();
            }
            if (arg0 == 1) {
                fragment = new Day_2();
            }
            if (arg0 == 2) {
                fragment = new Day_3();
            }
            if (arg0 == 3) {
                fragment = new Day_4();
            }


            return fragment;
        }

        @Override
        public int getCount() {
            return 4;
        }

    }

}

也许我正在寻找错误的区域，但我已尝试过以下链接，但到目前为止他们还没有工作过。

How to disable button click? How to disable button as soon as its clicked Click Limiting on <button>

Answer 1

首先，您应该将按钮存储在班级中的字段中，而不是每次调用函数时都找到它们，而是在活动onCreate（）中第一次找到它们。然后，在按钮的OnClick中，您可以在该按钮上调用setEnabled（false），具体取决于是否仍应启用该按钮。

Android：更改和限制按钮单击

1 个答案: