Android控件之ListView
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xml:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.zking.laci.android08.MainActivity"> <ListView android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/lv_list" android:layout_weight="1" ></ListView> </LinearLayout>
注意:如果不写android:descendantFocusability="blocksDescendants",ListView的点击事件就会和Button的点击事件冲突,只出现Button的点击效果
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="match_parent" android:descendantFocusability="blocksDescendants" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/res_iv" /> <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:id="@+id/res_tv" android:text="xx" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下载" android:id="@+id/res_bt" /> </LinearLayout>
Java:
import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; /** * Created by Laci on 2017/6/9. */ public class ItemTag { public ImageView iv; public TextView tv; public Button bt; }
import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; public class MainActivity extends AppCompatActivity { private ListView lv; private int images[]={R.drawable.bird,R.drawable.cat,R.drawable.chicken}; private String titles[]={"小鸟","猫猫","火鸡"}; private Button bt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv= (ListView) findViewById(R.id.lv_list); lv.setAdapter(new MyAdapter()); lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(MainActivity.this, "跳转到"+titles[position%titles.length], Toast.LENGTH_SHORT).show(); } }); } class MyAdapter extends BaseAdapter{ //指定的view有多少个 @Override public int getCount() { return 1000; } //内容 @Override public Object getItem(int position) { return titles[position%titles.length]; } //每一行的下标 @Override public long getItemId(int position) { return position; } //拿到每一行的view @Override public View getView(final int position, View convertView, ViewGroup parent) { //把布局文件转成view if(convertView==null){ convertView=getLayoutInflater().inflate(R.layout.res,null); //实例化自己写的实体类 ItemTag it=new ItemTag(); it.iv= (ImageView) convertView.findViewById(R.id.res_iv); it.tv= (TextView) convertView.findViewById(R.id.res_tv); it.bt= (Button) convertView.findViewById(R.id.res_bt); convertView.setTag(it); } ItemTag itg= (ItemTag) convertView.getTag(); //设置 itg.iv.setImageResource(images[position%titles.length]); itg.tv.setText(titles[position%titles.length]); itg.bt.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Toast.makeText(MainActivity.this, "状态下载"+titles[position%titles.length], Toast.LENGTH_SHORT).show(); } }); return convertView; } } }
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