伙计们，我没有合适的方法在 Android 应用程序的 ListView 中加载图像。我必须将图像与数据库中的文本一起加载到列表中。 我使用的数据库是MYSQL和PHP Server。
请帮助我。
这是我的代码。
Activity 类别:
public class DisplayMagazine extends ListActivity {
private ProgressDialog pDialog;
JSONParser jParser = new JSONParser();
ArrayList<HashMap<String, String>> magazinesList;
int year;
private static final String TAG_SUCCESS = "success";
private static final String TAG_MAGAZINE = "magazines";
private static final String TAG_MAGAZINE_IMAGE="magazineImage";
private static final String TAG_MONTH = "month";
private static final String TAG_PATH = "path";
JSONArray magazines = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.display_magazine);
Intent i = getIntent();
year = i.getIntExtra("year", 0);
magazinesList = new ArrayList<>();
new LoadAllMagazines().execute();
ListView lv = getListView();
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
TextView textView = (TextView) findViewById(R.id.path);
textView.setClickable(true);
textView.setMovementMethod(LinkMovementMethod.getInstance());
String text = "https://docs.google.com/gview?embedded=true&url="+ textView.getText();
textView.setText(Html.fromHtml(text));
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == 100) {
Intent intent = getIntent();
finish();
startActivity(intent);
}
}
class LoadAllMagazines extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(DisplayMagazine.this);
pDialog.setMessage("Loading Magazines. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<>();
params.add(new BasicNameValuePair("year", String.valueOf(year)));
//String url_all_magazines = "http://172.16.26.190/shifaspeaks/get_all_magazines.php";
String url_all_magazines = "http://10.3.1.117/shifaspeaks/get_all_magazines.php";
//String url_all_magazines = "http://192.168.1.4/shifaspeaks/get_all_magazines.php";
JSONObject json = jParser.makeHttpRequest(url_all_magazines, "GET", params);
Log.d("All Magazines: ", json.toString());
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
magazines = json.getJSONArray(TAG_MAGAZINE);
for (int i = 0; i < magazines.length(); i++) {
JSONObject c = magazines.getJSONObject(i);
String month = c.getString(TAG_MONTH);
String path = c.getString(TAG_PATH);
//String imageString=c.getString(TAG_MAGAZINE_IMAGE);
//byte[] image= Base64.decode(imageString.getBytes(), Base64.DEFAULT);
//Bitmap decodedByte= BitmapFactory.decodeByteArray(image,0,image.length);
HashMap<String, String> map = new HashMap<>();
map.put(TAG_MONTH, month);
map.put(TAG_PATH, path);
//map.put(TAG_MAGAZINE_IMAGE,decodedByte.toString());
magazinesList.add(map);
}
} else {
Intent i = new Intent(getApplicationContext(),
MainActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
runOnUiThread(new Runnable() {
public void run() {
ListAdapter adapter = new SimpleAdapter(
DisplayMagazine.this, magazinesList,
R.layout.list_item2, new String[] {TAG_MAGAZINE_IMAGE, TAG_MONTH,
TAG_PATH},
new int[] {R.id.magazineImage, R.id.month, R.id.path});
setListAdapter(adapter);
}
});
}
}
及其 XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
及其列表布局:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<!-- Product id (pid) - will be HIDDEN - used to pass to other activity -->
<TextView
android:id="@+id/month"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<!-- Name Label -->
<TextView
android:id="@+id/path"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:autoLink="web"
android:clickable="true"
android:paddingTop="6dip"
android:paddingLeft="6dip"
android:textSize="17dip"
android:textStyle="bold" />
和 PHP 服务器脚本:
<?php
mysql_connect('127.0.0.1:3306','root','');
mysql_select_db("shifaspeaks");
$response = array();
if(isset($_GET["year"])){
$year = $_GET["year"];
$result = mysql_query("SELECT month, path, magazineImage FROM magazine where year='$year'") or die(mysql_error());
if (mysql_num_rows($result) > 0) {
$response["magazines"] = array();
while ($row = mysql_fetch_array($result)) {
$magazine = array();
$magazine["month"] = $row["month"];
$magazine["path"] = $row["path"];
//$magazine["magazineImage"]=$row["magazineImage"];
array_push($response["magazines"], $magazine);
}
$response["success"] = 1;
echo json_encode($response);
} else {
$response["success"] = 0;
$response["message"] = "No magazines found";
echo json_encode($response);
}
记住我必须将图像及其文本从数据库加载到 android 中的列表中。谢谢您
最佳答案
嗨，首先你必须制作自定义适配器，你可以通过谷歌搜索如何在 android 中制作自定义适配器，然后制作一个描述你的杂志的 Item 类。 要显示图像，您可以使用 Piccaso Piccasso Image Loading库只是为了显示来自服务器的图像。
一步一步
为杂志制作类(class)
制作列表项布局(包含图像、名称和路径)
制作使用上述布局和 MAGAZINE 类的列表项的自定义适配器
在自定义适配器的 getView 方法中，使用任何图像加载库从服务器加载图像。
就是这样。享受....
关于php - 从服务器上的数据库加载列表中的图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31980536/