Question

Github代码：https://github.com/jjvang/AnimationDemo

您好，我不确定这是否可行，但我想将主要活动中的新数据发送到我的类，该类扩展了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。

我目前想要单击主活动上的按钮，然后ViewPager的信息将更改为新的。

我理解如何使用意图将信息从一个活动发送到另一个活动，但这似乎并不相同，因为它不会进入新的活动。

请告知。

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

为要在adapter.like imageresource，text中显示的所有数据创建一个pojo类。现在这里的YourData就是那个pojo类。所以现在你在适配器和适配器中使用相同的数据。使用您想要的数据创建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);
    }
}

在适配器中创建一个方法。当您使用适配器对象单击MainActivity调用方法中的按钮时，您可以在其中更新viewPagers数据。

如何将活动中的数据发送到扩展PagerAdapter的类

1 个答案: