Java 使用pasrequery的listview自定义适配器
我正在尝试创建一个演示应用程序,用户在其中输入搜索和目的地,数据将从parse.com查询,然后匹配结果将显示在下一屏幕的listview中。我已经学习了一些教程,但肯定不能足够具体地理解这个概念。当我输入搜索查询时,会显示进度条,然后应用程序返回到上一个活动。我不明白到底哪里出了问题 这是我的主要活动课Java 使用pasrequery的listview自定义适配器,java,android,parsing,listview,custom-adapter,Java,Android,Parsing,Listview,Custom Adapter,我正在尝试创建一个演示应用程序,用户在其中输入搜索和目的地,数据将从parse.com查询,然后匹配结果将显示在下一屏幕的listview中。我已经学习了一些教程,但肯定不能足够具体地理解这个概念。当我输入搜索查询时,会显示进度条,然后应用程序返回到上一个活动。我不明白到底哪里出了问题 这是我的主要活动课 public class CarpoolingActivitySearch extends ActionBarActivity { ListView listView; ArrayList&
public class CarpoolingActivitySearch extends ActionBarActivity {
ListView listView;
ArrayList<Travellers> travellers;
CarpoolingAdapter adapter;
protected ProgressDialog proDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_carpooling_activity_search);
final EditText mSrc = (EditText)findViewById(R.id.carpooling_source);
final EditText mDst = (EditText)findViewById(R.id.destination);
Button mSubmitButton = (Button)findViewById(R.id.carpooling_submit);
mSubmitButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String source = mSrc.getEditableText().toString();
String destination = mDst.getEditableText().toString();
listView = (ListView) findViewById(R.id.list);
ParseQuery<ParseObject> query = ParseQuery.getQuery("Carpooling");
query.whereEqualTo("Source", source); //assume you have a DonAcc column in your Country table
query.whereEqualTo("Destination", destination); //assume you have a DonAcc column in your Country table
startLoading();
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> parseObjects, ParseException e) {
if(e==null)
{
for(int i=0;i<parseObjects.size();i++)
{
Travellers travellers1 = new Travellers();
travellers1.setSource("Source");
travellers1.setDestination("Destination");
travellers.add(travellers1);
if(travellers.size() > 0)
{
adapter = new CarpoolingAdapter(getApplicationContext(),R.layout.activity_carpooling_activity_search,travellers);
listView.setAdapter(adapter);
} else {
AlertDialog.Builder popup = new AlertDialog.Builder(CarpoolingActivitySearch.this);
popup.setMessage("Seems our servers are busy. Try again in some time.");
popup.setPositiveButton("Back",null);
AlertDialog dialog = popup.create();
dialog.show();
}
}
stopLoading();
finish();
}
else {
stopLoading();
AlertDialog.Builder popup = new AlertDialog.Builder(CarpoolingActivitySearch.this);
popup.setMessage(e.getMessage());
popup.setPositiveButton("Back",null);
AlertDialog dialog = popup.create();
dialog.show();
}
}
});
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_carpooling_activity_search, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected void startLoading() {
proDialog = new ProgressDialog(this);
proDialog.setMessage("loading...");
proDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
proDialog.setCancelable(false);
proDialog.show();
}
protected void stopLoading() {
proDialog.dismiss();
proDialog = null;
}
}
名为activity\u carpooling\u activity\u search.xml的主布局文件
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.android.myapplication.Carpooling.Carpooling">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/carpooling_source"
android:hint="Source"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/destination"
android:hint="Destination"
android:layout_below="@+id/carpooling_source"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="86dp" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/carpooling_submit"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/scrollView"
android:layout_toEndOf="@+id/carpooling_submit"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_below="@+id/carpooling_submit">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/list" />
</ScrollView>
</RelativeLayout>
最后是我的list\u item\u deatil.xml文件
<?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"
android:weightSum="1">
<TextView
android:layout_width="174dp"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView"
android:layout_weight="0.13" />
<TextView
android:layout_width="245dp"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView2"
android:layout_weight="0.13" />
</LinearLayout>
我应该修改什么以使其正常工作?我没有收到任何错误。首先,您发布了一个很长的代码块,其中缩进不够好,无法读取代码。 所以我所理解的是,由于您的
ParseException e
为空,这意味着没有异常。在该if
块中,在for
循环之后,您正在调用finish()
,这将导致当前活动实例被销毁,从而转到上一个活动。
我希望这对你有帮助
<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.example.android.myapplication.Carpooling.Carpooling">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/carpooling_source"
android:hint="Source"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/destination"
android:hint="Destination"
android:layout_below="@+id/carpooling_source"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="86dp" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Submit"
android:id="@+id/carpooling_submit"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/scrollView"
android:layout_toEndOf="@+id/carpooling_submit"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentBottom="true"
android:layout_below="@+id/carpooling_submit">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/list" />
</ScrollView>
</RelativeLayout>
<?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"
android:weightSum="1">
<TextView
android:layout_width="174dp"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView"
android:layout_weight="0.13" />
<TextView
android:layout_width="245dp"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/textView2"
android:layout_weight="0.13" />
</LinearLayout>