やりたいこと
JSONから情報を取得しListViewに表示。そのとき、JSONと画像はVolleyで取ってくる。
必要なファイル（クラス）
- MyActivity.java メイン。
- Member.java ListViewで表示するデータ。ArrayListで使う。
- MemberAdapter.java カスタムアダプター（肝）。
- MyLruCache.java キャッシュクラス。ImageLoaderの引数に必要（まるまるコピペ）
追記：JsonObjectRequestの第三引数を(String)null,と型指定しました。
コード
setAdapter(adapter)の後にリクエスト。
MyActivity.java
public class MyActivity extends Activity {
ListView myListView;
RequestQueue queue;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
//queue for imageLoader
queue = Volley.newRequestQueue(this);
//db
MyDbHelper mDbHelper = new MyDbHelper(this);
SQLiteDatabase db = mDbHelper.getWritableDatabase();
//array list
final ArrayList<Member> members = new ArrayList<Member>();
//adapter
MemberAdapter adapter = new MemberAdapter(this,0,members,queue);
//listview
myListView = (ListView)findViewById(R.id.myListView);
//bindして表示
myListView.setAdapter(adapter);
//クリックしたとき各行のデータ（特に_id）を取得
myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//
String s1 = ((TextView)view.findViewById(R.id.txtName)).getText().toString();
String s2 = ((TextView)view.findViewById(R.id.txtAge)).getText().toString();
Log.v("tama","position=" + s1);
Log.v("tama","position=" + s2);
}
});
//非同期 json request
String api_url = "http://www.bluecode.jp/test/getMembers.php";
JsonObjectRequest jsonRequest = new JsonObjectRequest(Request.Method.GET,api_url,(String)null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject jsonObject) {
try{
JSONArray json_members = jsonObject.getJSONArray("members");
for(int i=0;i<json_members.length();i++){
//取得
JSONObject member = json_members.getJSONObject(i);
String name = member.getString("name");
String age = member.getString("age");
String url = member.getString("url");
//表示
Member m = new Member();
m.setImage(BitmapFactory.decodeResource(getResources(),R.drawable.ic_launcher));
m.setName(name);
m.setAge(Integer.parseInt(age));
m.setUrl(url);
members.add(m);
//
}
}catch (Exception e){
}
}
},
new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError error){
//
}
}
);
//実行（キュー）
queue.add(jsonRequest);
}
@Override
protected void onResume(){
super.onResume();
if(queue!=null){
queue.start();
}
}
@Override
protected void onPause(){
super.onPause();
if(queue!=null){
queue.stop();
}
}
}
特に説明なし。
Member.java
public class Member {
//declear
private Bitmap image;
private String name;
private int age;
private String url;
//set
//image
public Bitmap getImage(){
return this.image;
}
public void setImage(Bitmap image){
this.image = image;
}
//name
public String getName(){
return this.name;
}
public void setName(String name){
this.name = name;
}
//age
public int getAge(){
return this.age;
}
public void setAge(int age){
this.age = age;
}
//url
public String getUrl(){
return this.url;
}
public void setUrl(String url){
this.url = url;
}
}
肝。sqliteをソースにした時と変わらず。
MemberAdapter.java
public class MemberAdapter extends ArrayAdapter<Member> {
//Inflater
private LayoutInflater layoutInflater;
private ImageLoader imageLoader;
//constructor
public MemberAdapter(Context context, int resource,ArrayList<Member> members,RequestQueue queue) {
super(context, resource, members);
imageLoader = new ImageLoader(queue,new MyLruCache());
this.layoutInflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public View getView(int position,View convertView, ViewGroup parent){
ViewHolder viewHolder;
//最初 or 再利用するものがなかったら
if(convertView == null){
//レイアウトを指定
convertView = layoutInflater.inflate(R.layout.row,null);
viewHolder = new ViewHolder(convertView);
convertView.setTag(viewHolder);
}else {
viewHolder = (ViewHolder)convertView.getTag();
}
//普通の処理
//レイアウトの取得と値のマッピング
Member member = (Member) getItem(position);
//cancel
ImageLoader.ImageContainer imageContainer = (ImageLoader.ImageContainer)viewHolder.memberImage.getTag();
if(imageContainer != null){
imageContainer.cancelRequest();
}
//
//viewHolder.memberImage.setImageBitmap(member.getImage());
String url = member.getUrl();
ImageLoader.ImageListener listener = ImageLoader.getImageListener(
viewHolder.memberImage, R.drawable.ic_launcher, R.drawable.ic_launcher);
Log.v("tama",url);
imageLoader.get(url,listener);
viewHolder.memberName.setText(member.getName());
viewHolder.memberAge.setText(Integer.toString(member.getAge()));
viewHolder.memberUrl.setText(member.getUrl());
//
return convertView;
}
//ViewHolder
private static class ViewHolder{
ImageView memberImage;
TextView memberName;
TextView memberAge;
TextView memberUrl;
public ViewHolder(View view){
this.memberImage = (ImageView)view.findViewById(R.id.image);
this.memberName = (TextView)view.findViewById(R.id.txtName);
this.memberAge = (TextView)view.findViewById(R.id.txtAge);
this.memberUrl = (TextView)view.findViewById(R.id.txtUrl);
}
}
}
Cacheのコード。
レピカ開発者のブログのコードをそのまま利用させていただきました。
MyLruCache.java
public class MyLruCache implements ImageLoader.ImageCache{
private LruCache<String, Bitmap> mMemoryCache;
public MyLruCache() {
int maxSize = 10 * 1024 * 1024;
mMemoryCache = new LruCache<String, Bitmap>(maxSize) {
@Override
protected int sizeOf(String key, Bitmap value) {
return value.getRowBytes() * value.getHeight();
}
};
}
@Override
public Bitmap getBitmap(String url) {
return mMemoryCache.get(url);
}
@Override
public void putBitmap(String url, Bitmap bitmap) {
mMemoryCache.put(url, bitmap);
}
}