如何从活动的数据发送到扩展PagerAdapter

Question

类

Github的代码：

你好，我不知道这是可能的，但我想从主要活动上我的课延伸发送新数据PagerAdapter。这个应用程序只是一个具有自定义适配器的ViewPager的简单演示。

我当前想要点击主活动上的一个按钮，然后ViewPager的信息就会更改为新的。

我知道如何使用intents将信息从一个活动发送到另一个活动，但这看起来不一样，因为它没有进入新活动。

请指教。

谢谢！

MainActivity：

public class MainActivity extends AppCompatActivity { 
     ViewPager viewPager; 
     customSwip customSwip; 
     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_main); 

      viewPager=(ViewPager)findViewById(R.id.viewPager); 
      customSwip=new customSwip(this); 
      viewPager.setAdapter(customSwip); 

      Button button = (Button)findViewById(R.id.button); 
      button.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        // SOMEHOW PASS THESE DATA TO customSWIP to set new values 
        int [] imageResources ={R.drawable.capture1,R.drawable.capture2,R.drawable.capture3,R.drawable.capture4,R.drawable.capture5}; 
        String[] imageText = {"new", "two", "three", "four", "five"}; 
        String[] imageHmong = {"new", "new", "new", "new", "new"}; 
       } 
      }); 

     } 
    } 

customSwip：

public class customSwip extends PagerAdapter { 
     private int [] imageResources ={R.drawable.capture1,R.drawable.capture2,R.drawable.capture3,R.drawable.capture4,R.drawable.capture5}; 
     private String[] imageText = {"one", "two", "three", "four", "five"}; 
     private String[] imageDifferent = {"61236", "612361", "612361", "612361", "612361"}; 
     private Context ctx; 
     private LayoutInflater layoutInflater; 

     public customSwip(Context c) { 
      ctx=c; 
     } 

     @Override 
     public int getCount() { 
      return imageResources.length; 
     } 

     @Override 
     public Object instantiateItem(ViewGroup container, int position) { 
      layoutInflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      View itemView=layoutInflater.inflate(R.layout.activity_custom_swip,container,false); 
      ImageView imageView=(ImageView) itemView.findViewById(R.id.swip_image_view); 
      TextView textHmong=(TextView) itemView.findViewById(R.id.different); 
      TextView textEnglish=(TextView) itemView.findViewById(R.id.english); 
      imageView.setImageResource(imageResources[position]); 
      final String dummytext = imageText[position]; 
      textHmong.setText(imageDifferent[position]); 
      textEnglish.setText(imageText[position]); 
      container.addView(itemView); 
      imageView.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        Toast.makeText(ctx, "" + dummytext, Toast.LENGTH_SHORT).show(); 
       } 
      }); 
      return itemView; 
     } 

     @Override 
     public void destroyItem(ViewGroup container, int position, Object object) { 

     } 

     @Override 
     public boolean isViewFromObject(View view, Object object) { 

      return (view==object); 
     } 
    } 

Answer 1

创建一个POJO类，所有要在adapter.like imageresource显示，文本数据。 现在在这里YourData是pojo类。 所以现在你在适配器以及适配器中使用相同的数据。 用你想要的数据创建customSwip的构造函数。

public class customSwip extends PagerAdapter { 
YourPojo yourPojo; 
    private int [] imageResources ={R.drawable.capture1,R.drawable.capture2,R.drawable.capture3,R.drawable.capture4,R.drawable.capture5}; 
    private String[] imageText = {"one", "two", "three", "four", "five"}; 
    private String[] imageDifferent = {"61236", "612361", "612361", "612361", "612361"}; 
    private Context ctx; 
    private LayoutInflater layoutInflater; 

    public customSwip(Context c,YourPojo yourPojo) { 
     ctx=c; 
     this.yourPojo=yourPojo; 
    } 

    @Override 
    public int getCount() { 
     return imageResources.length; 
    } 

    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     layoutInflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View itemView=layoutInflater.inflate(R.layout.activity_custom_swip,container,false); 
     ImageView imageView=(ImageView) itemView.findViewById(R.id.swip_image_view); 
     TextView textHmong=(TextView) itemView.findViewById(R.id.different); 
     TextView textEnglish=(TextView) itemView.findViewById(R.id.english); 
     imageView.setImageResource(imageResources[position]); 
     final String dummytext = imageText[position]; 
     textHmong.setText(imageDifferent[position]); 
     textEnglish.setText(imageText[position]); 
     container.addView(itemView); 
     imageView.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Toast.makeText(ctx, "" + dummytext, Toast.LENGTH_SHORT).show(); 
      } 
     }); 
     return itemView; 
    } 

    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 

    } 

    @Override 
    public boolean isViewFromObject(View view, Object object) { 

     return (view==object); 
    } 
} 

并在适配器中创建一个方法。 当您在使用适配器对象的MainActivity调用方法中单击按钮时，您可以在其中更新viewPagers数据。