public class RegularExpensesActivity extends ListActivity implements OnClickListener{
private static final String TAG = "RegularExpensesActivity";
private static final int state_edit = 0;
private static final int state_insert = 1;
private static final String array_key = "array";
private static final String pref_name = "Setting";
private static final String des_key = "DES";
private static final String amt_key = "AMT";
private String des;
private String amt;
private ArrayList<HashMap<String, String>> list;
ArrayList<String> array;
HashMap<String, String> map;
private SharedPreferences preferences;
private SharedPreferences.Editor editor;
private Button add_btn;
private EditText description;
private EditText amount;
private SimpleAdapter adapter;
private int clickedPosition;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.setting_reg_list);
preferences = getSharedPreferences (pref_name, MODE_PRIVATE);
list = new ArrayList<HashMap<String, String>>();
map = new HashMap<String, String>();
retrieveAndLoadData();
displayList();
add_btn = (Button) findViewById(R.id.button_add_reg);
add_btn.setOnClickListener(this);
add_btn.setText(R.string.btn_add);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
clickedPosition = position;
openDialog(state_edit);
}
@Override
public void onClick(View view) {
if(view==add_btn){
openDialog(state_insert);
}
}
private void openDialog(int state) {
LayoutInflater inflater = (LayoutInflater) getBaseContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.reg_add_edit, null);
description = (EditText) view.findViewById(R.id.edit_reg_description);
amount = (EditText) view.findViewById(R.id.edit_reg_amount);
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setView(view)
.setIcon(android.R.drawable.ic_menu_more);
switch(state){
case state_insert:
alert.setTitle("Add Record")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
if(!description.getText().toString().equals(null)&& !amount.getText().toString().equals(null)){
array.add(description.getText().toString());
map = new HashMap<String, String>();
map.put(des_key, description.getText().toString());
map.put(amt_key, amount.getText().toString());
list.add(map);
editor = preferences.edit();
editor.putString(array_key, fromArrayListToString(array));
editor.putString(""+array.indexOf(description.getText().toString()), amount.getText().toString());
editor.commit();
adapter.notifyDataSetChanged();
dialog.dismiss();
}
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
}
});
break;
case state_edit:
String selectedDes;
String selectedAmt;
selectedDes = array.get(clickedPosition);
selectedAmt = preferences.getString(""+clickedPosition, "0");
description.setText(selectedDes);
amount.setText(selectedAmt);
alert.setTitle("Edit Record")
.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
if(!description.getText().toString().equals(null)&& !amount.getText().toString().equals(null)){
array.set(clickedPosition, description.getText().toString());
map = new HashMap<String, String>();
map.put(des_key, description.getText().toString());
map.put(amt_key, amount.getText().toString());
list.set(clickedPosition, map);
editor = preferences.edit();
editor.putString(array_key, fromArrayListToString(array));
editor.putString(""+clickedPosition, amount.getText().toString());
editor.commit();
dialog.dismiss();
adapter.notifyDataSetChanged();
Toast.makeText(getBaseContext(),"Record added.",Toast.LENGTH_LONG).show();
}
}
})
.setNegativeButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
array.remove(clickedPosition);
list.remove(clickedPosition);
for(int i = clickedPosition;i<array.size();i++){
int oldPosition = i+1;
String old = preferences.getString(""+oldPosition,"0");
editor = preferences.edit();
editor.putString(""+i, old);
}
editor.putString(array_key, fromArrayListToString(array));
editor.commit();
dialog.cancel();
adapter.notifyDataSetChanged();
Toast.makeText(getBaseContext(),"Deleted.",Toast.LENGTH_LONG).show();
}
});
break;
}
alert.create();
alert.show();
}
public String fromArrayListToString(ArrayList<String> arrayList) {
StringBuffer packedString = new StringBuffer();
for (int i = 0; i < arrayList.size(); i++) {
if (i > 0) {
packedString.append("\u001f");
}
packedString.append(arrayList.get(i));
}
return packedString.toString();
}
public ArrayList<String> getArrayList(String packedString) {
String[] array = packedString.split("\u001f");
ArrayList<String> returnArrayList = new ArrayList<String>();
Log.d(TAG, "split array length: "+array.length);
if(!array[0].equals("")){
for (int i = 0; i < array.length; i++) {
returnArrayList.add(array[i]);
}
}
return returnArrayList;
}
private String convText(TextView v,String text) {
switch (v.getId()) {
case R.id.reg_amount:
double dblAmt;
if(!text.equals("0")){
DecimalFormat twoDigit = new DecimalFormat("#,##0.00");
dblAmt = Double.parseDouble(text);
return "RM "+twoDigit.format(dblAmt);
}
}
return text;
}
private void displayList() {
adapter = new SimpleAdapter(this, list, R.layout.reg_row, new String[] { des_key, amt_key },
new int[] { R.id.reg_description,R.id.reg_amount}){
@Override
public void setViewText(TextView v, String text) {
super.setViewText(v, convText(v, text));
}
};
setListAdapter(adapter);
}
private void retrieveAndLoadData() {
des=preferences.getString(array_key,"");
Log.d(TAG, des);
array = getArrayList(des);
for(int i=0;i<array.size();i++){
map = new HashMap<String, String>();
map.put(des_key, array.get(i));
map.put(amt_key, preferences.getString(""+i, "0"));
list.add(map);
}
}
}
我是Android应用程序开发的初学者，我真的需要一些帮助。当我添加第一条记录时，我的代码运行良好，我可以在重新启动应用程序后恢复记录。但是当我试图添加第二条记录时，我会收到此警告，并且在重新启动后我无法获得以前保存的记录。
WARN/ApplicationContext(17598): getSharedPreferences
WARN/ApplicationContext(17598): org.xmlpull.v1.XmlPullParserException: Error parsing document. (position:line -1, column -1) caused by: org.apache.harmony.xml.ExpatParser$ParseException: At line 4, column 27: not well-formed (invalid token)
WARN/ApplicationContext(17598): at org.apache.harmony.xml.ExpatPullParser$ByteDocument.flush(ExpatPullParser.java:958)
WARN/ApplicationContext(17598): at org.apache.harmony.xml.ExpatPullParser$Document.pump(ExpatPullParser.java:769)
WARN/ApplicationContext(17598): at org.apache.harmony.xml.ExpatPullParser$Document.dequeue(ExpatPullParser.java:813)
WARN/ApplicationContext(17598): at org.apache.harmony.xml.ExpatPullParser.next(ExpatPullParser.java:302)
WARN/ApplicationContext(17598): at com.android.internal.util.XmlUtils.readValueXml(XmlUtils.java:675)
WARN/ApplicationContext(17598): at com.android.internal.util.XmlUtils.readMapXml(XmlUtils.java:470)
WARN/ApplicationContext(17598): at android.app.ContextImpl.getSharedPreferences(ContextImpl.java:373)
WARN/ApplicationContext(17598): at android.content.ContextWrapper.getSharedPreferences(ContextWrapper.java:146)
WARN/ApplicationContext(17598): at com.yan.app.RegularExpensesActivity.onCreate(RegularExpensesActivity.java:78)
WARN/ApplicationContext(17598): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
WARN/ApplicationContext(17598): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)
WARN/ApplicationContext(17598): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)
WARN/ApplicationContext(17598): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
WARN/ApplicationContext(17598): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)
WARN/ApplicationContext(17598): at android.os.Handler.dispatchMessage(Handler.java:99)
WARN/ApplicationContext(17598): at android.os.Looper.loop(Looper.java:123)
WARN/ApplicationContext(17598): at android.app.ActivityThread.main(ActivityThread.java:3647)
WARN/ApplicationContext(17598): at java.lang.reflect.Method.invokeNative(Native Method)
WARN/ApplicationContext(17598): at java.lang.reflect.Method.invoke(Method.java:507)
WARN/ApplicationContext(17598): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
WARN/ApplicationContext(17598): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
WARN/ApplicationContext(17598): at dalvik.system.NativeStart.main(Native Method)
为什么会这样？谁能给我一些建议？我的代码有什么问题？感谢。
编辑：
editor = preferences.edit();
for(int i = clickedPosition;i<array.size();i++){
int oldPosition = i+1;
String old = preferences.getString(""+oldPosition,"0");
editor.putString(""+i, old);
}
editor.putString(array_key, fromArrayListToString(array));
editor.commit();
使用我的代码更新。
答案 0 :(得分：1)
public void onClick(DialogInterface dialog,int id) {
array.remove(clickedPosition);
list.remove(clickedPosition);
for(int i = clickedPosition;i<array.size();i++){
int oldPosition = i+1;
String old = preferences.getString(""+oldPosition,"0");
editor = preferences.edit();
editor.putString(""+i, old);
}
editor.putString(array_key, fromArrayListToString(array));
editor.commit();
dialog.cancel();
adapter.notifyDataSetChanged();
Toast.makeText(getBaseContext(),"Deleted.",Toast.LENGTH_LONG).show();
}
});
这看起来很奇怪。在for循环中，你打开多个编辑器而不提交它们，最后你只提交最后一个。我不知道这是否是您问题的根源，但这是一个问题：）
答案 1 :(得分：0)
你需要这个：
preferences = getAplicationContext().getSharedPreferences (pref_name, MODE_PRIVATE);
如果我没弄错，sharedPreferences需要aplication的上下文。