Android：更改並限制按鈕點擊

Question

在獲取2個按鈕時遇到問題。

在下面的屏幕截圖中，我製作了2個按鈕，名爲NEXT & BACK。這些按鈕允許用戶將其從第1周更改爲第3周。當他們點擊NEXT併到達Week時，我需要該按鈕禁用並且不允許他們繼續進行，因爲它只有最多3周。同樣的事情適用於後退按鈕和循環，並達到第1周。請參閱下面的代碼。

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; 
     } 

    } 

} 

也許我找錯地區，但我試過下面的鏈接，到目前爲止，他們還沒有工作。

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

Answer 1

首先，你應該保存你的按鈕在你的類區域，而不是找到他們每個函數被調用的時候，發現他們在活動中的onCreate第一次（）代替。然後，在OnClick按鈕中，您可以調用該按鈕上的setEnabled（false），具體取決於是否仍然啓用該按鈕。