Question

我有一个viewpager，我正在显示一些文本。我还有一个按钮，当我点击它时，我想在viewpager中更改textview的TextSize。这是我的代码：

public class SrtSample extends Activity {

LayoutInflater inflater ;
@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.full_image);

    ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
    viewPager.setBackgroundColor(0xff000000);
    SlideSrt adapter = new SlideSrt(this);
    viewPager.setAdapter(adapter);

Button b= (Button) findViewById(R.id.pgtpics);

b.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // Dont know what to write here. 
        // This is the code i am using here but its not working.
inflater = (LayoutInflater)this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View vi = inflater.inflate(R.layout.MyLayout, null); 
            TextView tv = (TextView)vi.findViewById(R.id.tv);
            tv.setTextSize(25);
    }
}); 

}

}

这是viewpager的pagerAdapter类：

public class SlideSrt extends PagerAdapter {
Context context;
LayoutInflater inflater;

String s1 = "Text1";
String s2 = "Text2";
String s3 = "Text3";
String s4 = "Text4";
String s5 = "Text5";

String allStrings[] = {s1,s2,s3,s4,s5} 

//Constructor
SlideSrt(Context context) {
    this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

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

@Override
public boolean isViewFromObject(View view, Object object) {
    return view == ((LinearLayout) object);
}

public Object instantiateItem(ViewGroup container, int position) {

    View itemview;
    itemview = inflater.inflate(R.layout.MyLayout, container, false);
    TextView tv= (TextView) itemview.findViewById(R.id.tv);

  tv.setText(allsrt[position]);

    ((ViewPager) container).addView(itemview, 0);

    return itemview;

}


@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    ((ViewPager) container).removeView((View) object);
}
}

当我点击按钮时，没有任何反应。 textSize保持不变。我必须在OnclickListener方法中做错事。或者必须有其他一些方法。请帮我。我一直试图解决这个问题，但没有运气。

Answer 1

在onClick方法中，您正在膨胀R.layout.MyLayout，但您没有将其附加到可见父级。所以你的TextView实际上并不可见。而不是给布局充气，请在包含TextView的视图上调用findViewById。

如何在按钮上更改textView的文本大小？

1 个答案: