Question

图像滑块正常工作，直到我不在图像中加载图像。那就是：

int imageId[]={


};

但是一旦我这样做了：

int imageId[]={
        R.drawable.mi

};

让我们知道我有一个有图像的活动A.现在，如果我长按该图像，另一个活动B应该开始。但Android应用程序突然关闭。

这是我的活动代码：

package com.example.hotel_app_regularuser;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

public class PageTwo extends Activity {
 ViewPager vpager;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_page_two);
  vpager = (ViewPager) findViewById(R.id.viewPager);
  PagerAdapter adapter = new customAdapter(PageTwo.this);
  vpager.setAdapter(adapter);

 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.page_two, menu);
  return true;
 }

}


class customAdapter extends PagerAdapter {
 Context context;
 int imageId[] = {
  R.drawable.mi

 };
 public customAdapter(Context context) {
  this.context = context;
 }



 public Object InstantiateItem(ViewGroup container, int item) {

  LayoutInflater inflater = ((Activity) context).getLayoutInflater();
  View viewitem = inflater.inflate(R.layout.activity_page_two, container, false);
  ImageView im = (ImageView) viewitem.findViewById(R.id.imageView1);
  im.setImageResource(imageId[item]);
  TextView textView1 = (TextView) viewitem.findViewById(R.id.textView1);
  textView1.setText("hi");
  ((ViewPager) container).addView(viewitem);

  return viewitem;
 }
 @Override
 public int getCount() {
  // TODO Auto-generated method stub
  return imageId.length;
 }

 @Override
 public boolean isViewFromObject(View arg0, Object arg1) {
  // TODO Auto-generated method stub
  return arg0 == ((View) arg1);
 }
 @Override
 public void destroyItem(ViewGroup container, int position, Object object) {
  // TODO Auto-generated method stub
  ((ViewPager) container).removeView((View) object);
 }

}

Answer 1

更改：

public Object InstantiateItem(ViewGroup container, int item) {

到：

@Override
public Object instantiateItem(ViewGroup container, int position) {

在您的代码中，它将解决问题。

即添加@Override并将方法名称从instantiateItem更改为InstantiateItem

Answer 2

只需添加@Override关键字，就像我在InstantiateItem()方法中添加的一样。

 @Override
 public Object InstantiateItem(ViewGroup container, int item) {

  LayoutInflater inflater = ((Activity) context).getLayoutInflater();
  View viewitem = inflater.inflate(R.layout.activity_common_preferences, container, false);
  ImageView im = (ImageView) viewitem.findViewById(R.id.imageView1);
  im.setImageResource(imageId[item]);
  TextView textView1 = (TextView) viewitem.findViewById(R.id.textView1);
  textView1.setText("hi");
  ((ViewPager) container).addView(viewitem);

  return viewitem;
 }

Answer 3

我刚刚发现这一行：

View viewitem=inflater.inflate(R.layout.activity_page_two,container,false);

我在写：

View `viewitem=inflater.inflate(R.layout.activity_commonpreferences,container,false);`

另外，正如@ Ashish Ranjan指出的那样，我改变了

public Object InstantiateItem(ViewGroup container, int item) {

到

@Override
public Object instantiateItem(ViewGroup container, int position) {

更改这些有助于顺利运行我的应用程序。

android中的ImageSlider显示错误

3 个答案: