简单使用
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity"
tools:layout_editor_absoluteY="81dp">
<ListView
android:id="@+id/lv"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fastScrollEnabled="true" />
</android.support.constraint.ConstraintLayout>
package com.example.administrator.logincase;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
public class myAdapter extends BaseAdapter {
private Context context;
public myAdapter(Context pContext) {
context = pContext;
}
@Override
public int getCount() {
return 100000;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
EditText editor;
if (convertView == null) {
editor = new EditText(context);
} else {
editor = (EditText) convertView;
}
editor.setText("haha" + position);
return editor;
}
}
package com.example.administrator.logincase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ListView lv = findViewById(R.id.lv);
lv.setAdapter(new myAdapter(this));
}
}
复杂使用方法
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/iv_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@mipmap/ic_launcher" />
<TextView
android:id="@+id/tv_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="3dp"
android:layout_toRightOf="@+id/iv_image"
android:ellipsize="end"
android:singleLine="true"
android:text="这是一个测试的程序这是一个测试的程序这是一个测试的程序这是一个测试的程序"
android:textColor="#000000"
android:textSize="20sp" />
<TextView
android:id="@+id/tv_message"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/tv_title"
android:layout_marginTop="10dp"
android:layout_toRightOf="@+id/iv_image"
android:ellipsize="end"
android:singleLine="true"
android:text="这是一个测试的程序这是一个测试的程序这是一个测试的程序这是一个测试的程序"
android:textColor="#999999"
android:textSize="15sp" />
</RelativeLayout>
package com.example.administrator.logincase;
import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
public class myAdapter extends BaseAdapter {
private Context context;
public myAdapter(Context pContext) {
context = pContext;
}
@Override
public int getCount() {
return 100000;
}
@Override
public Object getItem(int position) {
return null;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View view;
if (convertView == null) {
/**
* 将一个布局文件转换为View
* */
view = View.inflate(context, R.layout.item, null);
} else {
view = convertView;
}
return view;
}
}
- 效果
根据布局文件生成View的方法
view = View.inflate(context, R.layout.item, null)
view=LayoutInflater.from(context).inflate(R.layout.item,null)
LayoutInflater inflater= (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE)
view =inflater.inflate(R.layout.item,null)
simpleAdapter的使用
package com.example.administrator.logincase;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
simpleAdapterTest();
}
private void simpleAdapterTest() {
Map<String, String> map1 = new HashMap<String, String>();
map1.put("name", "我爱罗");
map1.put("phone", "12898989");
Map<String, String> map2 = new HashMap<String, String>();
map2.put("name", "大蛇丸");
map2.put("phone", "13584");
Map<String, String> map3 = new HashMap<String, String>();
map3.put("name", "鸣人");
map3.put("phone", "456123");
Map<String, String> map4 = new HashMap<String, String>();
map4.put("name", "佐助");
map4.put("phone", "98656");
Map<String, String> map5 = new HashMap<String, String>();
map5.put("name", "雏田");
map5.put("phone", "756656");
List<Map<String, String>> list = new ArrayList<Map<String, String>>();
list.add(map1);
list.add(map2);
list.add(map3);
list.add(map4);
list.add(map5);
SimpleAdapter adapter = new SimpleAdapter(this, list, R.layout.item,
new String[]{"name", "phone"}, new int[]{R.id.tv_name,R.id.tv_Phone});
ListView lv = findViewById(R.id.lv);
lv.setAdapter(adapter);
}
}