java - 如何在 SQLite 数据库中存储 DatePicker 时间？我的老是崩溃

Question

我使用互联网上的各种资源创建了一个简单的记录保存应用程序。我能够成功存储文本数据 - 但是，当我尝试合并 TimePicker 时，我最终导致整个应用程序崩溃。在上一篇文章中，我被指导如何添加此功能 - 但是当我尝试为时间选择器数据添加字段时，整个应用程序将关闭(当然不会保存数据)

How do I store TimePicker Data in my simple record keeping app?

我被指示(上面的用户)使用以下内容:

CREATE TABLE ...... dtField date, tmpName Text.....

使用以下内容将日期保存为文本

//示例日期格式 - 2013-03-21 13:12:00

android.text.format.DateFormat.format("yyyy-MM-dd hh:mm:ss", dtDate.getTime())

我已经实现了前半部分(我相信)。后半部分我不太确定如何正确实现(我需要帮助的第一件事)，并且我的应用程序在进行这些更改后也会强制关闭(我需要帮助的第二件事。)

非常感谢任何解决此问题的帮助! (我有点菜鸟 - 所以说明越详细 - 越好!)

提前致谢，

阿曼尼·斯旺

附注

我根据 Robby Pond 的建议更新了下面的源代码:

替换

编辑文本时间Et与

时间选择器时间Et

但我仍然无法运行下面所示的代码。

有人可以查看一下 logcat 或问题日志，并告诉我您是否能说出目前导致问题的原因吗？ Robby Pond 的建议很有帮助，但我对下面的(当前)源代码有更深层次的问题。

附注

我知道错误无法解析为类型通常表示缺少类或可能存在 XML 问题，但错误表示“TimePicker 无法解析为类型”，但是我没有 TimePicker.Java - I只是想使用下面 XML 中编码的时间选择器按钮。

XML:数据输入

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" 
android:layout_height="wrap_content" android:layout_weight="1">

<LinearLayout android:id="@+id/linearLayout"
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:orientation="vertical" 
  android:padding="5dp">

  <EditText android:id="@+id/nameEdit"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content" 
     android:imeOptions="actionNext" 
     android:hint="@string/name_hint"
     android:inputType="textPersonName|textCapWords"/>

  <EditText android:id="@+id/capEdit"
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:imeOptions="actionNext" 
     android:hint="@string/cap_hint"
     android:inputType="textPersonName|textCapWords"/>

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Data Limit"
    android:textColor="#ffffff"
    android:textAppearance="?android:textAppearanceMedium" />

<SeekBar
    android:id="@+id/seekBar1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1.0"
        android:gravity="left"
        android:textColor="#ffffff"
        android:text="10MB" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1.0"
        android:gravity="right"
        android:textColor="#ffffff"
        android:text="Unlimited Data" />
</LinearLayout>

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Bandwidth Limit"
    android:textColor="#ffffff"
    android:textAppearance="?android:textAppearanceMedium" />

<SeekBar
    android:id="@+id/seekBar1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1.0"
        android:gravity="left"
        android:textColor="#ffffff"
        android:text="10kbs" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1.0"
        android:textColor="#ffffff"
        android:gravity="right"
        android:text="Unlimited Bandwidth" />
</LinearLayout>

 <TextView
    android:id="@+id/TextView02"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:textAppearanceSmall" />

 <TextView
    android:id="@+id/TextView02"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="WiFi Time Limit"
    android:textColor="#ffffff"
    android:textAppearance="?android:textAppearanceMedium" />

 <TimePicker
    android:id="@+id/timeEdit"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:gravity="center"
    android:layout_weight="1.0" />

<EditText
    android:id="@+id/codeEdit"
    android:inputType="textUri"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:lines="1"
    android:hint="@string/code_hint"
    android:imeOptions="actionNext" />




  <Button android:id="@+id/saveBtn" 
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_marginTop="15dp"
     android:layout_gravity="center_horizontal"
     android:text="@string/save_btn"/>
 </LinearLayout>
 </ScrollView>

JAVA:数据输入

package com.nfc.linkingmanager;


import android.app.Activity;
import android.app.AlertDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class AddEditCountry extends Activity {

 private long rowID; 
 private EditText nameEt;
 private EditText capEt;
 private EditText codeEt;
 private TimePicker timeEt;

   @Override
   public void onCreate(Bundle savedInstanceState) 
   {
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.add_country);

      nameEt = (EditText) findViewById(R.id.nameEdit);
      capEt = (EditText) findViewById(R.id.capEdit);
      codeEt = (EditText) findViewById(R.id.codeEdit);
      timeEt = (TimePicker) findViewById(R.id.timeEdit);


      Bundle extras = getIntent().getExtras(); 

      if (extras != null)
      {
         rowID = extras.getLong("row_id");
         nameEt.setText(extras.getString("name"));  
         capEt.setText(extras.getString("cap"));  
         codeEt.setText(extras.getString("code"));  
         timeEt.setText(extras.getString("time"));  
      }

      Button saveButton =(Button) findViewById(R.id.saveBtn);
      saveButton.setOnClickListener(new OnClickListener() {

          public void onClick(View v) 
          {
             if (nameEt.getText().length() != 0)
             {
                AsyncTask<Object, Object, Object> saveContactTask = 
                   new AsyncTask<Object, Object, Object>() 
                   {
                      @Override
                      protected Object doInBackground(Object... params) 
                      {
                         saveContact();
                         return null;
                      }

                      @Override
                      protected void onPostExecute(Object result) 
                      {
                         finish();
                      }
                   }; 

                saveContactTask.execute((Object[]) null); 
             }

             else
             {
                AlertDialog.Builder alert = new AlertDialog.Builder(AddEditCountry.this);
                alert.setTitle(R.string.errorTitle); 
                alert.setMessage(R.string.errorMessage);
                alert.setPositiveButton(R.string.errorButton, null); 
                alert.show();
             }
          } 
     });
   }

   private void saveContact() 
   {
      DatabaseConnector dbConnector = new DatabaseConnector(this);

      if (getIntent().getExtras() == null)
      {
          dbConnector.insertContact(nameEt.getText().toString(),
                  capEt.getText().toString(),
                  timeEt.getText().toString(),
                  codeEt.getText().toString());
      }
      else
      {
         dbConnector.updateContact(rowID,
            nameEt.getText().toString(),
            capEt.getText().toString(),
            timeEt.getText().toString(),
            codeEt.getText().toString());
      }
   }
}

XML:数据输出

<?xml version="1.0" encoding="utf-8"?>

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent" 
  android:layout_height="wrap_content"
  android:stretchColumns="1" 
  android:layout_margin="5dp">

   <TableRow>         
     <TextView 
        style="@style/StyleLabel"
        android:text="@string/name_lbl"/>
     <TextView 
        android:id="@+id/nameText" 
        style="@style/StyleText"/>         
  </TableRow>

  <TableRow>         
     <TextView 
        style="@style/StyleLabel"
        android:text="@string/cap_lbl"/>         
     <TextView 
        android:id="@+id/capText"
        style="@style/StyleText"/>         
  </TableRow>

  <TableRow>         
     <TextView 
        style="@style/StyleLabel"
        android:text="@string/code_lbl"/>         
     <TextView 
        android:id="@+id/codeText"
        style="@style/StyleText"/>         
  </TableRow>
  <TableRow>         
     <TextView 
        style="@style/StyleLabel"
        android:text="Linked Users"/>         
     <TextView 
        android:id="@+id/codeText"
        style="@style/StyleText"/>         
  </TableRow>
   <TableRow>         
     <TextView 
        style="@style/StyleLabel"
        android:text="Time Limit"/>         
     <TextView 
        android:id="@+id/timeText"
        style="@style/StyleText"/>         
  </TableRow>
</TableLayout>

数据输出:JAVA

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.TextView;

public class ViewCountry extends Activity {

   private long rowID;
   private TextView nameTv;
   private TextView capTv;
   private TextView codeTv; 
   private TextView timeTv; 

   @Override
   public void onCreate(Bundle savedInstanceState) 
   {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.view_country);

      setUpViews();
      Bundle extras = getIntent().getExtras();
      rowID = extras.getLong(CountryList.ROW_ID); 
   }

   private void setUpViews() {
       nameTv = (TextView) findViewById(R.id.nameText);
       capTv = (TextView) findViewById(R.id.capText);
       timeTv = (TextView) findViewById(R.id.timeText);
       codeTv = (TextView) findViewById(R.id.codeText);
   }

   @Override
   protected void onResume()
   {
      super.onResume();
      new LoadContacts().execute(rowID);
   } 

   private class LoadContacts extends AsyncTask<Long, Object, Cursor> 
   {
      DatabaseConnector dbConnector = new DatabaseConnector(ViewCountry.this);

      @Override
      protected Cursor doInBackground(Long... params)
      {
         dbConnector.open();
         return dbConnector.getOneContact(params[0]);
      } 

      @Override
      protected void onPostExecute(Cursor result)
      {
         super.onPostExecute(result);

         result.moveToFirst();
         // get the column index for each data item
         int nameIndex = result.getColumnIndex("name");
         int capIndex = result.getColumnIndex("cap");
         int codeIndex = result.getColumnIndex("code");
         int timeIndex = result.getColumnIndex("time");

         nameTv.setText(result.getString(nameIndex));
         capTv.setText(result.getString(capIndex));
         timeTv.setText(result.getString(timeIndex));
         codeTv.setText(result.getString(codeIndex));

         result.close();
         dbConnector.close();
      }
   } 


   @Override
   public boolean onCreateOptionsMenu(Menu menu) 
   {
      super.onCreateOptionsMenu(menu);
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.view_country_menu, menu);
      return true;
   }

   @Override
   public boolean onOptionsItemSelected(MenuItem item) 
   {
      switch (item.getItemId())
      {
         case R.id.editItem:
            Intent addEditContact =
               new Intent(this, AddEditCountry.class);

            addEditContact.putExtra(CountryList.ROW_ID, rowID);
            addEditContact.putExtra("name", nameTv.getText());
            addEditContact.putExtra("cap", capTv.getText());
            addEditContact.putExtra("time", timeTv.getText());
            addEditContact.putExtra("code", codeTv.getText());
            startActivity(addEditContact); 
            return true;

         case R.id.deleteItem:
            deleteContact();
            return true;

         default:
            return super.onOptionsItemSelected(item);
      } 
   }

   private void deleteContact()
   {

      AlertDialog.Builder alert = new AlertDialog.Builder(ViewCountry.this);

      alert.setTitle(R.string.confirmTitle); 
      alert.setMessage(R.string.confirmMessage); 

      alert.setPositiveButton(R.string.delete_btn,
         new DialogInterface.OnClickListener()
         {
            public void onClick(DialogInterface dialog, int button)
            {
               final DatabaseConnector dbConnector = 
                  new DatabaseConnector(ViewCountry.this);

               AsyncTask<Long, Object, Object> deleteTask =
                  new AsyncTask<Long, Object, Object>()
                  {
                     @Override
                     protected Object doInBackground(Long... params)
                     {
                        dbConnector.deleteContact(params[0]); 
                        return null;
                     } 

                     @Override
                     protected void onPostExecute(Object result)
                     {
                        finish(); 
                     }
                  };

               deleteTask.execute(new Long[] { rowID });               
            }
         }
      );

      alert.setNegativeButton(R.string.cancel_btn, null).show();
   }
}

数据库连接器JAVA:

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;


public class DatabaseConnector {

private static final String DB_NAME = "WorldCountries";
private SQLiteDatabase database;
private DatabaseOpenHelper dbOpenHelper;

public DatabaseConnector(Context context) {
    dbOpenHelper = new DatabaseOpenHelper(context, DB_NAME, null, 1);
}

   public void open() throws SQLException 
   {
      //open database in reading/writing mode
      database = dbOpenHelper.getWritableDatabase();
   } 

   public void close() 
   {
      if (database != null)
         database.close();
   }       

   public void insertContact(String name, String cap, String code, String time) 
           {
              ContentValues newCon = new ContentValues();
              newCon.put("name", name);
              newCon.put("cap", cap);
              newCon.put("time", time);
              newCon.put("code", code);

              open();
              database.insert("country", null, newCon);
              close();
           }


           public void updateContact(long id, String name, String cap,String code, String time) 
           {
              ContentValues editCon = new ContentValues();
              editCon.put("name", name);
              editCon.put("cap", cap);
              editCon.put("time", time);
              editCon.put("code", code);

              open();
              database.update("country", editCon, "_id=" + id, null);
              close();
           }


           public Cursor getAllContacts() 
           {
              return database.query("country", new String[] {"_id", "name"}, 
                 null, null, null, null, "name");
           }

           public Cursor getOneContact(long id) 
           {
              return database.query("country", null, "_id=" + id, null, null, null, null);
           }

           public void deleteContact(long id) 
           {
              open(); 
              database.delete("country", "_id=" + id, null);
              close();
           }
}

数据库助手JAVA:

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class DatabaseOpenHelper extends SQLiteOpenHelper {

public DatabaseOpenHelper(Context context, String name,
        CursorFactory factory, int version) {
    super(context, name, factory, version);
}

@Override
public void onCreate(SQLiteDatabase db) {
    String createQuery = "CREATE TABLE country (_id integer primary key autoincrement,name, cap, code, time);";                 
    db.execSQL(createQuery);        
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

}

LOGCAT 数据:

03-21 17:17:24.276: I/Adreno200-EGLSUB(8655): <ConfigWindowMatch:2165>: Format RGBA_8888.
03-21 17:17:24.276: D/memalloc(8655): ion: Mapped buffer base:0x5ca41000 size:614400 offset:0 fd:57
03-21 17:17:24.276: E/(8655): Can't open file for reading
03-21 17:17:24.276: E/(8655): Can't open file for reading
03-21 17:17:24.376: D/memalloc(8655): ion: Mapped buffer base:0x5d12e000 size:614400 offset:0 fd:61
03-21 17:17:26.188: D/Activity(8655): Activity.onPause(), editTextTapSensorList size: 0
03-21 17:17:26.268: I/Adreno200-EGLSUB(8655): <ConfigWindowMatch:2165>: Format  RGBA_8888.
03-21 17:17:26.278: D/memalloc(8655): ion: Mapped buffer base:0x5d4ce000 size:614400  offset:0 fd:68
03-21 17:17:26.318: D/memalloc(8655): ion: Mapped buffer base:0x5d937000 size:614400 offset:0 fd:72
03-21 17:17:26.328: D/memalloc(8655): ion: Unmapping buffer  base:0x5ca41000 size:614400
03-21 17:17:26.328: D/memalloc(8655): ion: Unmapping buffer  base:0x5d12e000 size:614400
03-21 17:17:26.468: D/Activity(8655): Activity.onPause(), editTextTapSensorList size: 0
03-21 17:17:26.549: D/memalloc(8655): ion: Mapped buffer base:0x5c929000 size:614400 offset:0 fd:54
03-21 17:17:26.619: W/IInputConnectionWrapper(8655): getExtractedText on inactive  InputConnection
03-21 17:17:26.639: W/IInputConnectionWrapper(8655): getExtractedText on inactive InputConnection
03-21 17:17:48.322: D/Activity(8655): Activity.onPause(), editTextTapSensorList size: 0
03-21 17:17:48.342: W/dalvikvm(8655): threadid=1: thread exiting with uncaught exception (group=0x410889d8)
03-21 17:17:48.352: E/AndroidRuntime(8655): FATAL EXCEPTION: main
03-21 17:17:48.352: E/AndroidRuntime(8655): java.lang.Error: Unresolved compilation  problems: 
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a type
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a type
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a type
03-21 17:17:48.352: E/AndroidRuntime(8655):     timeEdit cannot be resolved or is not a field
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a  type
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a  type
03-21 17:17:48.352: E/AndroidRuntime(8655):     TimePicker cannot be resolved to a  type
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  com.nfc.linkingmanager.AddEditCountry.<init>(AddEditCountry.java:19)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at java.lang.Class.newInstanceImpl(Native Method)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  java.lang.Class.newInstance(Class.java:1319)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  android.app.Instrumentation.newActivity(Instrumentation.java:1025)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1875)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1985)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.app.ActivityThread.access$600(ActivityThread.java:127)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1151)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.os.Looper.loop(Looper.java:137)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at android.app.ActivityThread.main(ActivityThread.java:4477)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  java.lang.reflect.Method.invokeNative(Native Method)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at java.lang.reflect.Method.invoke(Method.java:511)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:788)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at   com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
03-21 17:17:48.352: E/AndroidRuntime(8655):     at  dalvik.system.NativeStart.main(Native Method)

问题:

    Description Resource    Path    Location    Type
user3SettingsSave cannot be resolved or is not a field  User3Settings.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 35 Java Problem
The import android.content.Context is never used    AppActivity.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 5  Java Problem
The import android.view.View.OnClickListener is never used  AppActivity.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 13 Java Problem
The value of the field AppActivity.button1 is not used  AppActivity.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 18 Java Problem
The value of the field AppActivity.button2 is not used  AppActivity.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 18 Java Problem
user3Tap cannot be resolved to a type   User3Settings.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 40 Java Problem
The value of the field AppActivity.button3 is not used  AppActivity.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 18 Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 19 Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 30 Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 30 Java Problem
The method deactivate() from the type Cursor is deprecated  CountryList.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 52 Java Problem
The constructor SimpleCursorAdapter(Context, int, Cursor, String[], int[]) is deprecated    CountryList.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 33 Java Problem
The import android.app.AlertDialog is never used    User1.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 4  Java Problem
The import android.view.View.OnClickListener is never used  User1.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 12 Java Problem
The method deactivate() from the type Cursor is deprecated  NewCore.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 54 Java Problem
The constructor SimpleCursorAdapter(Context, int, Cursor, String[], int[]) is deprecated    NewCore.java    /NFC Linking Manager/src/com/nfc/linkingmanager line 35 Java Problem
The import android.content.DialogInterface is never used    User1.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 6  Java Problem
The import android.widget.Button is never used  Link.java   /NFC Linking Manager/src/com/nfc/linkingmanager line 5  Java Problem
The import android.content.Intent is never used Link.java   /NFC Linking Manager/src/com/nfc/linkingmanager line 6  Java Problem
The import android.view.View.OnClickListener is never used  User1Settings.java  /NFC Linking Manager/src/com/nfc/linkingmanager line 10 Java Problem
The import android.view.View is never used  Link.java   /NFC Linking Manager/src/com/nfc/linkingmanager line 7  Java Problem
The import android.view.View.OnClickListener is never used  Link.java   /NFC Linking Manager/src/com/nfc/linkingmanager line 8  Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 99 Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 91 Java Problem
TimePicker cannot be resolved to a type AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 41 Java Problem
timeEdit cannot be resolved or is not a field   AddEditCountry.java /NFC Linking Manager/src/com/nfc/linkingmanager line 30 Java Problem
The method showDialog(int) from the type Activity is deprecated User2Settings.java   /NFC Linking Manager/src/com/nfc/linkingmanager    line 37 Java Problem

Answer 1

timeEt 字段应该是一个 TimePicker。您收到 ClassCastException 是因为在您的 Activity 中您将其声明为 EditText。

替换

EditText timeEt

与

TimePicker timeEt