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我使用ListView与ArrayAdapter并试图添加片段到ListView的所有行。但是,该应用程序无法正常工作:屏幕上仅显示一行,显示添加的片段但不是所有行。有时候,应用程序可能会因为内存不足而崩溃。Android的ArrayAdapter:添加的片段行错误地工作
有人可以给我一些建议吗?谢谢。
MainActivity.java
package com.me.test05;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
ListView myListView = (ListView) findViewById(R.id.myListView);
myListView.setAdapter(new MyArrayAdaptor(this, R.layout.row));
}
}
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
private static final String[] allnames = { "John", "Marry", "Smith", "Felicity", "Lion", "Math" };
public static class MyArrayAdaptor extends ArrayAdapter<String> {
private final Context context;
public MyArrayAdaptor(Context context, int resource) {
super(context, resource);
this.context = context;
}
@Override
public int getCount() {
return allnames.length * 100;
}
@Override
public String getItem(int position) {
return allnames[position % allnames.length];
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.row, parent, false);
TextView textView = (TextView) rowView.findViewById(R.id.textView1);
String str = getItem(position);
textView.setText(str);
FragmentTransaction ft = ((Activity) context).getFragmentManager().beginTransaction();
ft.replace(R.id.myFrameLayout, new PlaceholderFragment());
ft.commit();
return rowView;
}
}
}
文件activity.xml:
<merge xmlns:android="http://schemas.android.com/apk/res/android"
android:fitsSystemWindows="true">
<ListView android:id="@+id/myListView"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:dividerHeight="2px">
</ListView>
</merge>
文件row.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="abc" />
<FrameLayout
android:id="@+id/myFrameLayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>
</FrameLayout>
</LinearLayout>
文件fragment_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:text="Button" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
</LinearLayout>
屏幕看起来像:
为什么你想显示的片段?列表视图应该做什么?我认为你做得比应该更难。 –
仅用于处理复杂性:在接下来的步骤中,我添加的片段可能更复杂,可能是10个不同的片段。另外,不仅每行可以添加一个但少量的片段 – Tony