Java 重复包含其他UI元素的LinearLayout元素并用数据填充它
我已经用xml创建了一些“数据行模板”。看起来是这样的:Java 重复包含其他UI元素的LinearLayout元素并用数据填充它,java,android,adt,Java,Android,Adt,我已经用xml创建了一些“数据行模板”。看起来是这样的: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="match_parent" android:padding="8dp"&g
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="8dp">
<ImageView
android:layout_width="56dp"
android:layout_height="56dp"
android:background="#CCCCCC"
android:layout_margin="8dp" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Name Last Name"
android:textSize="20dp"
android:textColor="#757575"
android:layout_margin="8dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some very long long description. Some very long long description. Some very long long description."
android:textSize="14dp"
android:textColor="#222222"
android:layout_margin="8dp"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weightSum="3">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 1"
android:layout_margin="8dp"
android:layout_weight="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 1"
android:layout_margin="8dp"
android:layout_weight="1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 2"
android:layout_margin="8dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
预览如下所示:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="8dp">
<ImageView
android:layout_width="56dp"
android:layout_height="56dp"
android:background="#CCCCCC"
android:layout_margin="8dp" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Name Last Name"
android:textSize="20dp"
android:textColor="#757575"
android:layout_margin="8dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some very long long description. Some very long long description. Some very long long description."
android:textSize="14dp"
android:textColor="#222222"
android:layout_margin="8dp"/>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:weightSum="3">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 1"
android:layout_margin="8dp"
android:layout_weight="1"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 1"
android:layout_margin="8dp"
android:layout_weight="1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Param 2"
android:layout_margin="8dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
现在我想在一些活动中插入许多“行模板”,并用数据填充这些行
我应该如何处理这个问题?通过编程或其他方式创建所有内容?您必须使用可使用自定义适配器填充的列表视图。请按照下面的说明了解更多信息。您必须使用可使用CustomAdapter填充的ListView。请按照下面的说明了解更多信息。您必须使用可使用CustomAdapter填充的ListView。请按照下面的说明了解更多信息。您必须使用可使用CustomAdapter填充的ListView。请跟随以获取更多信息。看起来您想要生成一些列表。手动生成会降低应用程序的性能。要生成列表,必须使用Listview和该Listview的自定义适配器。我建议您创建自定义BaseAdapter()。看起来您想要生成一些列表。手动生成会降低应用程序的性能。要生成列表,必须使用Listview和该Listview的自定义适配器。我建议您创建自定义BaseAdapter()。看起来您想要生成一些列表。手动生成会降低应用程序的性能。要生成列表,必须使用Listview和该Listview的自定义适配器。我建议您创建自定义BaseAdapter()。看起来您想要生成一些列表。手动生成会降低应用程序的性能。要生成列表,必须使用Listview和该Listview的自定义适配器。我建议您创建自定义BaseAdapter()。试试这种方法,希望这能帮助您解决问题。 此布局使用定义活动的ListView 活动\u main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="8dp">
<ImageView
android:id="@+id/imgIcon"
android:layout_width="56dp"
android:layout_height="56dp"
android:background="#CCCCCC"
android:layout_margin="8dp" />
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/txtFirstLastName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Name Last Name"
android:textSize="20dp"
android:textColor="#757575"
android:layout_margin="8dp"/>
<TextView
android:id="@+id/txtDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some very long long description. Some very long long description. Some very long long description."
android:textSize="14dp"
android:textColor="#222222"
android:layout_margin="8dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/txtParams1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1"/>
<TextView
android:id="@+id/txtParams2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1" />
<TextView
android:id="@+id/txtParams3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
这个布局与您创建的布局相同,我刚刚给ImageView、TextView指定了id,并更正了LinearLayout的权重
list_item.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:padding="8dp">
<ImageView
android:id="@+id/imgIcon"
android:layout_width="56dp"
android:layout_height="56dp"
android:background="#CCCCCC"
android:layout_margin="8dp" />
<LinearLayout
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/txtFirstLastName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First Name Last Name"
android:textSize="20dp"
android:textColor="#757575"
android:layout_margin="8dp"/>
<TextView
android:id="@+id/txtDescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Some very long long description. Some very long long description. Some very long long description."
android:textSize="14dp"
android:textColor="#222222"
android:layout_margin="8dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/txtParams1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1"/>
<TextView
android:id="@+id/txtParams2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1" />
<TextView
android:id="@+id/txtParams3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:layout_weight="1" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
该类包含ListView初始化和自定义适配器,作为内部类,还为ListView 3项生成临时HashMap ArrayList,实现ListView项单击侦听器
MainActivity.java
public class MainActivity extends ActionBarActivity {
private ListView listView;
private CustomAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView) findViewById(R.id.listView);
final ArrayList<HashMap<String,Object>> list = new ArrayList<HashMap<String, Object>>();
HashMap<String,Object> map1 = new HashMap<String,Object>();
map1.put("Image",R.drawable.ic_launcher);
map1.put("FirstLastName", "FirstLastName 1");
map1.put("Descriptions","Descriptions 1 Descriptions 1 Descriptions 1 Descriptions 1 Descriptions 1 Descriptions 1 Descriptions 1 Descriptions 1");
map1.put("Params1","Params1 1");
map1.put("Params2","Params2 1");
map1.put("Params3","Params3 1");
list.add(map1);
HashMap<String,Object> map2 = new HashMap<String,Object>();
map2.put("Image",R.drawable.ic_launcher);
map2.put("FirstLastName","FirstLastName 2");
map2.put("Descriptions","Descriptions 2 Descriptions 2 Descriptions 2 Descriptions 2 Descriptions 2 Descriptions 2 Descriptions 2 Descriptions 2");
map2.put("Params1","Params1 2");
map2.put("Params2","Params2 2");
map2.put("Params3","Params3 2");
list.add(map2);
HashMap<String,Object> map3 = new HashMap<String,Object>();
map3.put("Image",R.drawable.ic_launcher);
map3.put("FirstLastName","FirstLastName 3");
map3.put("Descriptions","Descriptions 3 Descriptions 3 Descriptions 3 Descriptions 3 Descriptions 3 Descriptions 3 Descriptions 3 Descriptions 3");
map3.put("Params1","Params1 3");
map3.put("Params2","Params2 3");
map3.put("Params3","Params3 3");
list.add(map3);
adapter = new CustomAdapter(this,list);
listView.setAdapter(adapter);
listView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this,list.get(position).get("FirstLastName").toString(),Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
class CustomAdapter extends BaseAdapter {
private Context context;
private ArrayList<HashMap<String,Object>> data;
public CustomAdapter(Context context,ArrayList<HashMap<String,Object>> data){
this.context = context;
this.data = data;
}
@Override
public int getCount(){
return data.size();
}
@Override
public Object getItem(int position){
return data.get(position);
}
@Override
public long getItemId(int position){
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
ViewHolder holder;
if(convertView == null){
holder =new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.list_item, null);
holder.imgIcon = (ImageView)convertView.findViewById(R.id.imgIcon);
holder.txtFirstLastName = (TextView)convertView.findViewById(R.id.txtFirstLastName);
holder.txtDescription = (TextView)convertView.findViewById(R.id.txtDescription);
holder.txtParams1 = (TextView)convertView.findViewById(R.id.txtParams1);
holder.txtParams2 = (TextView)convertView.findViewById(R.id.txtParams2);
holder.txtParams3 = (TextView)convertView.findViewById(R.id.txtParams3);
convertView.setTag(holder);
}else{
holder = (ViewHolder)convertView.getTag();
}
holder.imgIcon.setImageResource((Integer) data.get(position).get("Image"));
holder.txtFirstLastName.setText(data.get(position).get("FirstLastName").toString());
holder.txtDescription.setText(data.get(position).get("Descriptions").toString());
holder.txtParams1.setText(data.get(position).get("Params1").toString());
holder.txtParams2.setText(data.get(position).get("Params2").toString());
holder.txtParams3.setText(data.get(position).get("Params3").toString());
return convertView;
}
class ViewHolder{
ImageView imgIcon;
TextView txtFirstLastName;
TextView txtDescription;
TextView txtParams1;
TextView txtParams2;
TextView txtParams3;
}
}
}
公共类MainActivity扩展了ActionBarActivity{
私有列表视图列表视图;
专用自定义适配器;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView=(listView)findViewById(R.id.listView);
最终ArrayList=新ArrayList();
HashMap map1=新的HashMap();
map1.put(“图像”,R.drawable.ic_发射器);
map1.put(“FirstLastName”、“FirstLastName 1”);
地图1.put(“说明”、“说明1说明1说明1说明1说明1说明1说明1说明1说明1说明1”);
map1.put(“参数1”、“参数1”);
map1.put(“参数2”、“参数2 1”);
map1.put(“Params3”、“params31”);
列表。添加(map1);
HashMap map2=新的HashMap();
map2.put(“图像”,R.drawable.ic_发射器);
map2.put(“FirstLastName”、“FirstLastName 2”);
map2.put(“说明”、“说明2说明2说明2说明2说明2说明2说明2说明2说明2说明2说明2说明2”);
map2.put(“参数1”、“参数12”);
map2.put(“参数2”、“参数2”);
map2.put(“Params3”、“params32”);
列表。添加(map2);
HashMap map3=新的HashMap();
map3.put(“图像”,R.drawable.ic_发射器);
map3.put(“FirstLastName”、“FirstLastName 3”);
map3.put(“说明”、“说明3说明3说明3说明3说明3说明3说明3说明3说明3说明3”);
map3.put(“参数1”、“参数13”);
map3.put(“参数2”、“参数23”);
map3.put(“参数3”、“参数3”);
列表。添加(map3);
适配器=新的CustomAdapter(此,列表);
setAdapter(适配器);
listView.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
Toast.makeText(MainActivity.this,list.get(position).get(“FirstLastName”).toString(),Toast.LENGTH_SHORT.show();
}
@凌驾
未选择公共无效(AdapterView父级){
}
});
}
类CustomAdapter扩展了BaseAdapter{
私人语境;
私有数组列表数据;
公共CustomAdapter(上下文、ArrayList数据){
this.context=上下文;
这个数据=数据;
}
@凌驾
public int getCount(){
返回data.size();
}
@凌驾
公共对象getItem(int位置){
返回数据。获取(位置);
}
@凌驾
公共长getItemId(int位置){
返回位置;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视窗座;
if(convertView==null){
holder=新的ViewHolder();
convertView=LayoutFlater.from(上下文)。充气(R.layout.list_项,空);
holder.imgIcon=(ImageView)convertView.findViewById(R.id.imgIcon);
holder.txtFirstLastName=(TextView)convertView.findViewById(R.id.txtFirstLastName);
holder.txtDescription=(TextView)convertView.findViewById(R.id.txtDescription);