Android之ListView与SimpleAdapter的使用

先说明一下，这里的数据使用sqlite里面存进去的，后面会写sqlite的具体使用

直接看效果图



首先在activity_main.xml定义一个ListView的控件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >

<ListView
android:id="@+id/listView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button2"
android:layout_below="@+id/button2" >
</ListView>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:text="@string/add" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/button1"
android:layout_marginTop="27dp"
android:text="@string/queryAll" />

<Button
android:id="@+id/update"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button2"
android:layout_alignBottom="@+id/button2"
android:layout_toRightOf="@+id/button2"
android:text="@string/update" />

<Button
android:id="@+id/delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/update"
android:layout_alignBottom="@+id/update"
android:layout_alignRight="@+id/listView1"
android:text="@string/delete" />

<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@+id/button2"
android:text="@string/interf" />

<Button
android:id="@+id/add2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button3"
android:layout_alignBottom="@+id/button3"
android:layout_alignParentRight="true"
android:text="@string/add2" />

</RelativeLayout>

然后为每一行记录定义一个布局my_listvie.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/RelativeLayout01"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingBottom="4dip"
android:paddingLeft="12dip"
android:paddingRight="12dip" >

<ImageView
android:id="@+id/ItemImage"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:contentDescription="@string/hello"
android:paddingTop="12dip" />

<TextView
android:id="@+id/ItemTitle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/textview01"
android:textSize="20sp" />

<TextView
android:id="@+id/ItemText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/ItemTitle"
android:text="@string/textview02" />

</RelativeLayout>

然后是程序运行的MainActivity类，里面有些接口调用的可以忽略不看，直接看display()方法就可以，

public class MainActivity extends Activity implements OnClickListener {

private ListView lv;
private Button btn1;
private Button btn2;
private Button interf;
private Button add;
private Button delete;
private Button update;
private DBManager mgr;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mgr = new DBManager(this);

btn1 = (Button) findViewById(R.id.button1);
btn2 = (Button) findViewById(R.id.button2);
interf = (Button) findViewById(R.id.button3);

add = (Button) findViewById(R.id.add2);
delete = (Button) findViewById(R.id.delete);
update = (Button) findViewById(R.id.update);

btn1.setOnClickListener(this);
btn2.setOnClickListener(this);
interf.setOnClickListener(this);
add.setOnClickListener(this);
delete.setOnClickListener(this);
update.setOnClickListener(this);
}

public void add() {
for (int i = 1; i <= 5; i++) {
Person person = new Person("yang-" + i, 23, "Hello world-" + i);
mgr.add(person);
}
}

public void queryAll() {
List<Person> persons = mgr.queryAll();
display(persons);
}

public void interfaceInvocation() {
ContentResolver resolver = this.getContentResolver();
Uri uri = Uri.parse("content://com.example.z_sqlite.yang/query");
Cursor cursor = resolver.query(uri, null, null, null, null);
List<Person> persons = new ArrayList<Person>();
if (cursor.moveToFirst()) {
while (!cursor.isAfterLast()) {
Person person = new Person();
person.setId(cursor.getInt(cursor.getColumnIndex("id")));
person.setName(cursor.getString(cursor.getColumnIndex("name")));
person.setAge(cursor.getInt(cursor.getColumnIndex("age")));
person.setInfo(cursor.getString(cursor.getColumnIndex("info")));
persons.add(person);
cursor.moveToNext();
}
cursor.close();
}
display(persons);
}

public void display(List<Person> persons) {
lv = (ListView) findViewById(R.id.listView1);

List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();

for (Person person : persons) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("ItemImage", R.drawable.favicon);
map.put("name", person.getName());
map.put("ageinfo",
"id：" + person.getId() + "，今年 " + person.getAge()
+ " 岁，个人信息：" + person.getInfo());
list.add(map);
}

// 适配器
SimpleAdapter sa = new SimpleAdapter(this, list, R.layout.my_listvie,
new String[] { "ItemImage", "name", "ageinfo" }, new int[] {
R.id.ItemImage, R.id.ItemTitle, R.id.ItemText });

// 显示
lv.setAdapter(sa);

// 为每个Item添加监听
lv.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this, "点击了第" + position + "个Item：",
Toast.LENGTH_SHORT).show();
}
});

// 添加长按点击
lv.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {

menu.setHeaderTitle("长按菜单-ContextMenu");
menu.add(0, 1, 1, "修改");
menu.add(0, 2, 2, "删除");
menu.add(1, 3, 3, "更多");
}
});
}

// 长按菜单响应函数
@Override
public boolean onContextItemSelected(MenuItem item) {
setTitle("点击了长按菜单里面的第" + item.getItemId() + "个项目");
return super.onContextItemSelected(item);
}

public void add2() {
ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://com.example.z_sqlite.yang/insert");
ContentValues cv = new ContentValues();
cv.put("name", "willwind");
cv.put("age", 120);
cv.put("info", "到此一游，好困阿！");
Uri temp = resolver.insert(uri, cv);
Log.i("接口调用", "delete ---" + temp);
}

public void delete() {
ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://com.example.z_sqlite.yang/delete");
int flag = resolver.delete(uri, "id=?", new String[] { "10" });
Log.i("接口调用", "delete ---" + flag);
}

public void update() {
ContentResolver resolver = getContentResolver();
Uri uri = Uri.parse("content://com.example.z_sqlite.yang/update");
ContentValues cv = new ContentValues();
cv.put("name", "yangxuan");
cv.put("age", 120);
int flag = resolver.update(uri, cv, "id=?", new String[] { "11" });
Log.i("接口调用", "update ---" + flag);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if (v == btn1) {
add();
Toast.makeText(MainActivity.this, "数据添加成功！", Toast.LENGTH_SHORT)
.show();
Uri uri = Uri.parse("content://aaa.bbb.ccc");
v.getContext().getContentResolver().notifyChange(uri, null);
} else if (v == btn2) {
queryAll();
Toast.makeText(MainActivity.this, "查询成功！", Toast.LENGTH_SHORT)
.show();
} else if (v == interf) {
interfaceInvocation();
Toast.makeText(MainActivity.this, "接口调用查询成功！", Toast.LENGTH_SHORT)
.show();
} else if (v == add) {
add2();
Toast.makeText(MainActivity.this, "接口调用添加成功！", Toast.LENGTH_SHORT)
.show();
} else if (v == delete) {
delete();
Toast.makeText(MainActivity.this, "接口调用删除成功！", Toast.LENGTH_SHORT)
.show();
} else if (v == update) {
update();
Toast.makeText(MainActivity.this, "接口调用修改成功！", Toast.LENGTH_SHORT)
.show();
}
}

@Override
protected void onDestroy() {
// TODO Auto-generated method stub
mgr.closeDB();
super.onDestroy();
}
}