我想通过使用Picasso将Image设置为我的简单适配器ListView,我尝试了下面的代码,但它显示错误为“java.lang.IllegalArgumentException:Target不能为null”。在日志中,我该怎么做?
// MainActivity.java
StringRequest stringRequest = new StringRequest(Request.Method.POST, REGISTER_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObj = new JSONObject(response);
//Log.e(response,"sdsa");
// Getting JSON Array node
int iserror = jsonObj.getInt("error");
// Toast.makeText(MainActivity.this,iserror,Toast.LENGTH_LONG).show();
if (iserror == 1) {
String error_msg = jsonObj.getString("result");
Toast.makeText(Earn.this,error_msg,Toast.LENGTH_LONG).show();
}
JSONArray result = jsonObj.getJSONArray("result");
for (int j = 0; j < result.length(); j++) {
JSONObject apps_applist = result.getJSONObject(j);
iddstr = apps_applist.getString("id");
namestr = apps_applist.getString("name");
logostr=apps_applist.getString("logo");
HashMap<String, String> contact = new HashMap<>();
// adding each child node to HashMap key => value
contact.put("id", iddstr);
contact.put("name", namestr);
contact.put("logo", logostr);
Picasso.with(Earn.this)
.load(logostr)
// .placeholder(R.drawable.placeholder) // optional
//.error(R.drawable.error) // optional
.resize(400,400) // optional
.into((ImageView) findViewById(R.id.Img_Logo));
// adding contact to contact list
contactList.add(contact);
}
ListAdapter adapter = new SimpleAdapter(Earn.this, contactList,
R.layout.list_earn, new String[]{ "name","id","logo"},
new int[]{R.id.textView24, R.id.textView23, R.id.Img_Logo});
lv.setAdapter(adapter);
// list_earn.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"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:weightSum="1">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.15">
<ImageView
android:layout_width="113dp"
android:layout_height="107dp"
app:srcCompat="@mipmap/ic_launcher"
android:id="@+id/Img_Logo" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView23"
android:layout_weight="1"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="18dp" />
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textView24"
android:layout_below="@+id/textView23"
android:layout_alignLeft="@+id/textView23"
android:layout_alignStart="@+id/textView23"
android:layout_marginTop="23dp" />
<Button
android:text="Button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button4"
android:background="@drawable/button_format"
android:layout_below="@+id/Img_Logo"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="31dp" />
</RelativeLayout>
</LinearLayout>
// activity_main.xml中
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">
<ListView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>