[英]Data not stored into realm database
java.lang.IllegalStateException:您的領域是從沒有Looper的線程打開的,並且您提供了回調,我們需要一個Handler來調用您的回調
我正在寫一個將在后台執行的代碼-從文本文件(內部資產)中讀取,然后將它們放入領域數據庫中。但是我似乎收到此錯誤
“ java.lang.IllegalStateException:您的領域是從沒有Looper的線程打開的,並且您提供了回調,我們需要一個Handler來調用您的回調”
在我的onCreate我有這個
Realm.init(context);
realm = Realm.getDefaultInstance();
ParseInBackground task = new ParseInBackground();
task.execute();
在AsyncTask的后台執行任務中,我得到了這個
try {
realm = Realm.getDefaultInstance();
realm.executeTransactionAsync(new Realm.Transaction() {
@Override
public void execute(Realm bgRealm) {
final ModelClass modelClass = bgRealm.createObject(ModelClass.class);
try {
InputStream file = getAssets().open("goodie.txt");
reader = new BufferedReader(new InputStreamReader(file));
final String[] line = {reader.readLine()};
while (line[0] != null) {
handler.post(new Runnable() {
@Override
public void run() {
try {
line[0] = reader.readLine();
} catch (IOException e) {
e.printStackTrace();
}
String[] namelist = line[0].split(":");
String iWord = namelist[0];
String iDesc = namelist[1];
modelClass.setName(iWord);
modelClass.setDesc(iDesc);
count++;
}
});
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (realm != null)
realm.close();
}
}
}, new Realm.Transaction.OnSuccess() {
@Override
public void onSuccess() {
Toast.makeText(MainActivity.this, "Added " + count + "items", Toast.LENGTH_SHORT).show();
}
}, new Realm.Transaction.OnError() {
@Override
public void onError(Throwable error) {
}
}
);
} catch (Exception e) {
e.printStackTrace();
}
而名為ModelClass的Model類具有此
private String name;
private String desc;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
迫切需要幫助。
檢查http://developer.android.com/reference/android/os/Handler.html和http://developer.android.com/reference/android/os/Looper.html
基本上,Realm在進行asyc查詢時需要一種與線程進行通信的方式,在Android上,自然地,Looper和Handler是可行的方式。
檢查更多示例代碼。 https://github.com/realm/realm-java/tree/master/examples/threadExample
您需要從execute回調中刪除Handler.post(...)
。
realm.executeTransactionAsync(new Realm.Transaction() {
@Override
public void execute(Realm bgRealm) {
final ModelClass modelClass = bgRealm.createObject(ModelClass.class);
try {
InputStream file = getAssets().open("goodie.txt");
reader = new BufferedReader(new InputStreamReader(file));
final String[] line = {reader.readLine()};
while (line[0] != null) {
try {
line[0] = reader.readLine();
} catch (IOException e) {
e.printStackTrace();
}
String[] namelist = line[0].split(":");
String iWord = namelist[0];
String iDesc = namelist[1];
modelClass.setName(iWord);
modelClass.setDesc(iDesc);
count++;
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (realm != null)
realm.close();
}
}
}, new Realm.Transaction.OnSuccess() {
@Override
public void onSuccess() {
Toast.makeText(MainActivity.this, "Added " + count + "items", Toast.LENGTH_SHORT).show();
}
}, new Realm.Transaction.OnError() {
@Override
public void onError(Throwable error) {
}
}
);
} catch (Exception e) {
e.printStackTrace();
}
我希望這有幫助。
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