[英]Retrieving data from parse server
我能够将字符串数组检索到列表视图中,但是当我尝试获取存储在解析的“ newStatus”列中的信息并将其放入新的活动“ StatusDetailView”中时,什么也没发生。
任何帮助都是有益的。 我提供的代码来自udemy教程,我无法联系到讲师。
在主页列表上单击某行时,该行中的文本显示在另一个活动“ StatusDetailView”中
StatusDetailView.java:
public class StatusDetailView extends Activity {
String objectId;
protected TextView mStatus;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.content_status_detail_view);
// initialize
mStatus = (TextView) findViewById(R.id.statusDetailView);
// Get the intent that started the activity
Intent intent = getIntent();
objectId = intent.getStringExtra("objectID"); // matches key in HomePageActivity
// query data from parse
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Status");
// Retrieve the object by id
query.getInBackground("objectId", new GetCallback<ParseObject>() {
@Override
public void done(ParseObject parseObject, ParseException e) {
if (e == null) {
// Success we have a status
String userStatus = parseObject.getString("newStatus"); // column
mStatus.setText(userStatus);
} else {
// there was an error, advise user
AlertDialog.Builder builder = new AlertDialog.Builder(StatusDetailView.this);
builder.setMessage(e.getMessage());
builder.setTitle("Sorry");
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// close the dialog
dialog.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
当我运行应用程序并选择一行时,它带我进入StatusDetailView活动,但出现错误,但列表显示8行:
这里:
query.getInBackground("objectId", new GetCallback<ParseObject>() {
^^^^^^^
..
}
将objectId
字符串作为id传递,而不是使用intent.getStringExtra
初始化的objectId
String的值。
要使其工作,请将其更改为:
query.getInBackground(objectId, new GetCallback<ParseObject>() {
...
}
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