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我是android.I的初学者,我试图在fragment.But中做图像listview,但没有完成。 这里我的代码是在实现列表视图与片段中的图像时出现错误
ListoneFragment.java:(这里NAME 1和NAME是我的strings.xml文件字符串数组名)
package fragments.h.safmical;
import android.app.Fragment;
import android.content.Context;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import safmical.h.R;
/**
* Created by hadvani on 4/14/2017.
*/
public class ListOneFragment extends Fragment {
String[] titles;
String[] shortforms;
int[] images={R.drawable.hcll,R.drawable.hno,R.drawable.hcll,R.drawable.hno,R.drawable.hcll,R.drawable.hno};
ListView listView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View rootview = inflater.inflate(R.layout.fragment_listone, container, false);
Resources res =getResources();
titles=res.getStringArray(R.array.name1);
shortforms=res.getStringArray(R.array.name2);
listView = (ListView) rootview.findViewById(R.id.list1);
MyAdapter adapter=new MyAdapter(this,titles,images,shortforms);
listView.setAdapter(adapter);
return rootview;
}
}
class MyAdapter extends ArrayAdapter<String>{
Context context;
int[] images;
String[] titleArray;
String[] shortformArray;
MyAdapter(Context c,String[] titles,int imgs[],String[] shortform){
super(c,R.layout.fragment_listpattern,R.id.textView1,titles);
this.context=c;
this.images=imgs;
this.titleArray=titles;
this.shortformArray=shortform;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row=inflater.inflate(R.layout.fragment_listpattern,parent,false);
ImageView myImage=(ImageView)row.findViewById(R.id.imageView2);
TextView myTitle=(TextView)row.findViewById(R.id.textView1);
TextView myShortform=(TextView) row.findViewById(R.id.textView2);
myImage.setImageResource(images[position]);
myTitle.setText(titleArray[position]);
myShortform.setText(shortformArray[position]);
return row;
}
}
这里我的XML文件
fragment_listone .xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/list1">
</ListView>
</FrameLayout>
fragment_listpattern.xml:(用于列表视图的单排模式)
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="72dp">
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@mipmap/ic_launcher_round" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/imageView2"
android:layout_toRightOf="@+id/imageView2"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_toEndOf="@+id/imageView2"
android:layout_toRightOf="@+id/imageView2"
android:text="TextView" />
</RelativeLayout>
</FrameLayout>
当我运行it.It显示错误:
Error:(37, 40) error: incompatible types: ListOneFragment cannot be converted to Context
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.
Information:BUILD FAILED
,它体现在建议ListoneFragment.java in line
MyAdapter adapter = new MyAdapter(this,titles,images,shortforms);参数 将方法'MyAdapter'的第一个参数从上下文更改为'ListoneFragment'。
当我这样做时,它会在MyAdapter类的构造函数中产生错误。 我该怎么做,有没有更正或有其他方法来实现this.Please帮助?
感谢man.it worked.But你能告诉我为什么以前编写的“本”作为一个参数不工作? – harsh
片段是活动的一部分...所以对于适配器中的上下文,您需要传递活动上下文:在您的活动中使用'getActivity()'和'this'关键字来传递上下文。所以它不会在你的片段类中工作 – rafsanahmad007