无法设置文本ViewPager [英] Cannot set text in ViewPager

问题描述

我ViewPager工作正常，但现在我想在我的ViewPager图像的顶部添加TexView，所以文本是连接到寻呼机。

我可以定义TexView很好，但是当我尝试的setText（）返回在此行一个NullPointerException异常：

score.setText（TEST）;

下面是code为我的适配器：

 私有类MyPagerAdapter扩展PagerAdapter {    公众诠释的getCount（）{
        返回5;
    }    公共对象instantiateItem（查看收集，INT位置）{        LayoutInflater吹气=（LayoutInflater）collection.getContext（）
                .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;        INT渣油= 0;
        开关（位置）{
        情况下0：
            渣油= R.layout.farleft;            分数=（的TextView）findViewById（R.id.textView1）;
            ** EXCEPTION这里** score.setText（TEST）;            打破;
        情况1：
            渣油= R.layout.left;
            打破;
        案例2：
            渣油= R.layout.middle;
            打破;
        案例3：
            渣油= R.layout.right;
            打破;
        情况4：
            渣油= R.layout.farright;
            打破;
        }        查看查看= inflater.inflate（渣油，NULL）;
        view.setTag（位置）;        view.setOnClickListener（新OnClickListener（）{
            公共无效的onClick（查看视图）{                INT位置=（整数）view.getTag（）;
                Log.v（Log_tag，在这里，图像点击+位置）;                如果（位置== 0）{
                    意向意图=新意图（LogoQuizActivity.this，
                            LevelOne.class）;
                    startActivity（意向）;                }                如果（位置== 1）{
                    意向意图=新意图（getBaseContext（）
                            LevelTwo.class）;
                    startActivity（意向）;
                }                如果（位置== 2）{
                    意向意图=新意图（getBaseContext（）
                            LevelThree.class）;
                    startActivity（意向）;
                }                如果（位置== 3）{
                    意向意图=新意图（getBaseContext（）
                            LevelFour.class）;
                    startActivity（意向）;
                }                如果（位置== 4）{
                    意向意图=新意图（getBaseContext（）
                            LevelFive.class）;
                    startActivity（意向）;
                }
            }
        }）;
        （（ViewPager）集合）.addView（查看，0）;        返回视图。
    }
 

解决方案

使用此

 查看=（查看）inflater.inflate（R.layout.your_layout，NULL）;
 

和查找的文本视图，如

 分数=（TextView中）view.findViewById（R.id.textView1）;
score.setText（TEST）;
 

My ViewPager works fine, but I am now trying to add a TexView on top of the image in my ViewPager, so the text is 'attached' to the pager.
I can define the TexView fine, but when I try to setText() it returns a NullPointerException on this line:
score.setText("TEST");

Here is the code for my adapter:

  private class MyPagerAdapter extends PagerAdapter {

    public int getCount() {
        return 5;
    }

    public Object instantiateItem(View collection, int position) {

        LayoutInflater inflater = (LayoutInflater) collection.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);         

        int resId = 0;
        switch (position) {
        case 0:
            resId = R.layout.farleft;

            score = (TextView) findViewById(R.id.textView1);
            **EXCEPTION HERE**      score.setText("TEST");

            break;
        case 1:
            resId = R.layout.left;
            break;
        case 2:
            resId = R.layout.middle;
            break;
        case 3:
            resId = R.layout.right;
            break;
        case 4:
            resId = R.layout.farright;
            break;
        }

        View view = inflater.inflate(resId, null);
        view.setTag(position);

        view.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {

                int position = (Integer) view.getTag();
                Log.v("Log_tag", "Here image is clicked" + position);

                if(position == 0){
                    Intent intent = new Intent(LogoQuizActivity.this,
                            LevelOne.class);
                    startActivity(intent);

                }

                if(position == 1){
                    Intent intent = new Intent(getBaseContext(),
                            LevelTwo.class);
                    startActivity(intent);
                }

                if(position == 2){
                    Intent intent = new Intent(getBaseContext(),
                            LevelThree.class);
                    startActivity(intent);
                }

                if(position == 3){
                    Intent intent = new Intent(getBaseContext(),
                            LevelFour.class);
                    startActivity(intent);
                }

                if(position == 4){
                    Intent intent = new Intent(getBaseContext(),
                            LevelFive.class);
                    startActivity(intent);
                }
            }
        });


        ((ViewPager) collection).addView(view, 0);

        return view;


    }

解决方案

Use this

View view = (View) inflater.inflate(R.layout.your_layout, null);

And find the text view such as

score = (TextView) view.findViewById(R.id.textView1);
score.setText("TEST");

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