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我是新手。如果我问一个荒谬的问题,我很抱歉。泛型ListAdapter如何工作?
我想要通用适配器类实现ListAdapter
。我必须重写它的一些功能,如getView
。
getView函数是我认为最重要的部分,它在渲染时调用(如asp.net(我认为))。
我已经写在下面的简单的层面上一些代码:
package com.yeni.listAdapter;
import android.app.ListActivity;
import android.os.Bundle;
public class baslangicAktivitesi extends ListActivity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.main);
setListAdapter(new NewAdapter(this));
}
}
这是我的通用ListAdapter类:
package com.yeni.listAdapter;
import android.content.Context;
import android.database.DataSetObserver;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.TextView;
public class NewAdapter implements ListAdapter {
private Context ctx;
public NewAdapter(Context _ctx) {
super();
ctx = _ctx;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Object getItem(int arg0) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public int getItemViewType(int arg0) {
// TODO Auto-generated method stub
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
TextView tv = new TextView(ctx);
tv.setText("This text will be shown");
LinearLayout lila = new LinearLayout(ctx);
lila.addView(tv,new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT));
return lila;
}
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 0;
}
@Override
public boolean hasStableIds() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEmpty() {
// TODO Auto-generated method stub
return false;
}
@Override
public void registerDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public void unregisterDataSetObserver(DataSetObserver observer) {
// TODO Auto-generated method stub
}
@Override
public boolean areAllItemsEnabled() {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean isEnabled(int position) {
// TODO Auto-generated method stub
return false;
}
}
,我想知道事情是怎么ListAdapter机制如果我想用xml编写模板(我认为它会)res->layout
它应该如何(复合视图,我想写点什么ImageView和TextView?
非常感谢你...