應用程序結束按鈕點擊

-1

我的程序包含一個活動來保存地點和日期到數據庫。但應用程序，而在確定button.here與logcat的應用程序結束按鈕點擊

FirstActivity.java

package example.showevent1; 
import android.os.Bundle; 
import android.app.DialogFragment; 
import android.support.v4.app.FragmentActivity; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.Spinner; 
import android.widget.TextView; 
import android.widget.AdapterView.OnItemSelectedListener; 

public class FirstActivity extends FragmentActivity implements OnItemSelectedListener { 
    /** Called when the activity is first created. */ 

    public TextView userSelection; 
    public EditText userText; 
    private static final String[] items={"Yalahanka","Rajai nagar","Sivaji Nagar","Koramangala","RT Nagar", "Banashankari","Yashwanthpura","Hebbal"}; 
    DatabaseHandler db = new DatabaseHandler(this); 
    public FirstActivity(){ 

    } 

    public FirstActivity(TextView userSelection2, EditText userText2) { 
     // TODO Auto-generated constructor stub 
     this.userSelection=userSelection; 
     this.userText=userText; 
    } 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_first); 
     userSelection=(TextView)findViewById(R.id.textView1); 
     userText=(EditText)findViewById(R.id.editText1); 
     Button okButton = (Button)findViewById(R.id.button1); 
     Spinner my_spin=(Spinner)findViewById(R.id.spinner1);//data1 
     my_spin.setOnItemSelectedListener(this); 
     ArrayAdapter aa=new ArrayAdapter(this, android.R.layout.simple_spinner_item,items); 
     aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
     my_spin.setAdapter(aa); 



    } 
    @Override 
    public void onItemSelected(AdapterView arg0, View arg1, int pos, long arg3) { 
     userSelection.setText(items[pos]); 
    } 
    @Override 
    public void onNothingSelected(AdapterView arg0) { 
     // TODO Auto-generated method stub 
     userSelection.setText(""); 
    } 
    public void showDatePickerDialog(View v) { 
     DialogFragment newFragment = new DatePickerFragment(); 
     newFragment.show(getFragmentManager(), "datePicker"); 
    } 
    public String getName(){ 
     return this.userSelection.toString(); 
    } 
    public String getPhoneNumber(){ 
     return this.userText.toString(); 
    } 

    public void add_data(View v){ 
     db.addContact(new FirstActivity(userSelection,userText)); 
    } 
    }

DatePickerFragment.java

package example.showevent1; 

import java.util.Calendar; 

import android.app.DatePickerDialog; 
import android.app.Dialog; 
import android.app.DialogFragment; 
import android.os.Bundle; 
import android.widget.DatePicker; 

public class DatePickerFragment extends DialogFragment 
          implements DatePickerDialog.OnDateSetListener { 

    @Override 
    public Dialog onCreateDialog(Bundle savedInstanceState) { 
     // Use the current date as the default date in the picker 
     final Calendar c = Calendar.getInstance(); 
     int year = c.get(Calendar.YEAR); 
     int month = c.get(Calendar.MONTH); 
     int day = c.get(Calendar.DAY_OF_MONTH); 

     // Create a new instance of DatePickerDialog and return it 
     return new DatePickerDialog(getActivity(), this, year, month, day); 
    } 

    public void onDateSet(DatePicker view, int year, int month, int day) { 
     // Do something with the date chosen by the user 
    } 
}

數據庫處理程序被點擊的代碼很遺憾結束。我只用的addContact和getcontact方法

package example.showevent1; 

import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

import java.util.ArrayList; 
import java.util.List; 
import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

public class DatabaseHandler extends SQLiteOpenHelper { 

    // All Static variables 
    // Database Version 
    private static final int DATABASE_VERSION = 1; 

    // Database Name 
    private static final String DATABASE_NAME = "contactsManager"; 

    // Contacts table name 
    private static final String TABLE_CONTACTS = "contacts"; 

    // Contacts Table Columns names 
    private static final String KEY_ID = "id"; 
    private static final String KEY_NAME = "name"; 
    private static final String KEY_PH_NO = "phone_number"; 

    public DatabaseHandler(Context context) { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    // Creating Tables 
    @Override 
    public void onCreate(SQLiteDatabase db) { 
     String CREATE_CONTACTS_TABLE = "CREATE TABLE " + TABLE_CONTACTS + "(" 
       + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT," + KEY_NAME + " TEXT," 
       + KEY_PH_NO + " TEXT" + ")"; 
     db.execSQL(CREATE_CONTACTS_TABLE); 
    } 

    // Upgrading database 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
     // Drop older table if existed 
     db.execSQL("DROP TABLE IF EXISTS " + TABLE_CONTACTS); 

     // Create tables again 
     onCreate(db); 
    } 

    /** 
    * All CRUD(Create, Read, Update, Delete) Operations 
    */ 

    // Adding new contact 
    void addContact(FirstActivity contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, contact.getName()); // Contact Name 
     values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone 

     // Inserting Row 
     db.insert(TABLE_CONTACTS, null, values); 
     db.close(); // Closing database connection 
    } 

    // Getting single contact 
    FirstActivity getContact(int id) { 
     SQLiteDatabase db = this.getReadableDatabase(); 

     Cursor cursor = db.query(TABLE_CONTACTS, new String[] { KEY_ID, 
       KEY_NAME, KEY_PH_NO }, KEY_ID + "=?", 
       new String[] { String.valueOf(id) }, null, null, null, null); 
     if (cursor != null) 
      cursor.moveToFirst(); 

     FirstActivity contact = new FirstActivity(); 
     // return contact 
     return contact; 
    } 

    // Getting All Contacts 
/* public List<Contact> getAllContacts() { 
     List<Contact> contactList = new ArrayList<Contact>(); 
     // Select All Query 
     String selectQuery = "SELECT * FROM " + TABLE_CONTACTS; 

     SQLiteDatabase db = this.getWritableDatabase(); 
     Cursor cursor = db.rawQuery(selectQuery, null); 

     // looping through all rows and adding to list 
     if (cursor.moveToFirst()) { 
      do { 
       Contact contact = new Contact(); 
       contact.setID(Integer.parseInt(cursor.getString(0))); 
       contact.setName(cursor.getString(1)); 
       contact.setPhoneNumber(cursor.getString(2)); 
       // Adding contact to list 
       contactList.add(contact); 
      } while (cursor.moveToNext()); 
     } 

     // return contact list 
     return contactList; 
    }  */ 

    // Updating single contact 
    /* public int updateContact(FirstActivity contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME, contact.getName()); 
     values.put(KEY_PH_NO, contact.getPhoneNumber()); 

     // updating row 
     return db.update(TABLE_CONTACTS, values, KEY_ID + " = ?", 
       new String[] { String.valueOf(contact.getID()) }); 
    }*/ 

    // Deleting single contact 
/* public void deleteContact(FirstActivity contact) { 
     SQLiteDatabase db = this.getWritableDatabase(); 
     db.delete(TABLE_CONTACTS, KEY_ID + " = ?", 
       new String[] { String.valueOf(contact.getID()) }); 
     db.close(); 
    }*/ 


    // Getting contacts Count 
    public int getContactsCount() { 
     String countQuery = "SELECT * FROM " + TABLE_CONTACTS; 
     SQLiteDatabase db = this.getReadableDatabase(); 
     Cursor cursor = db.rawQuery(countQuery, null); 
     cursor.close(); 

     // return count 
     return cursor.getCount(); 
    } 

}

activity_first.xml

<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:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:background="@color/color_1" 
    tools:context=".FirstActivity" > 

    <Button 
     android:id="@+id/button1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/spinner1" 
     android:layout_below="@+id/spinner1" 
     android:layout_marginTop="28dp" 
     android:background="#ffff99" 
     android:onClick="showDatePickerDialog" 
     android:text="@string/dt" 
     android:textColor="#b22924" /> 

    <TextView 
     android:id="@+id/textView1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/spinner1" 
     android:layout_alignParentTop="true" 
     android:layout_marginTop="31dp" 
     android:text="@string/select" 
     android:textAlignment="gravity" 
     android:textColor="#b22924" 
     android:textSize="20sp" 
     android:textStyle="bold" /> 

    <Spinner 
     android:id="@+id/spinner1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_below="@+id/textView1" 
     android:layout_marginTop="36dp" 
     android:background="#ffff99" 
     android:textColor="#b22924" 
     android:fadingEdge=""/> 

    <EditText 
     android:id="@+id/editText1" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBaseline="@+id/button1" 
     android:layout_alignBottom="@+id/button1" 
     android:layout_alignRight="@+id/spinner1" 
     android:background="#ffff99" 
     android:ems="10" > 

     <requestFocus /> 
    </EditText> 

    <Button 
     android:id="@+id/button2" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignRight="@+id/textView1" 
     android:layout_below="@+id/button1" 
     android:layout_marginTop="56dp" 
     android:text="@string/button" 
     android:onClick="add_data" /> 

</RelativeLayout>

logcat的

08-02 06:54:04.539: E/AndroidRuntime(1453): FATAL EXCEPTION: main 
08-02 06:54:04.539: E/AndroidRuntime(1453): java.lang.IllegalStateException: Could not execute method of the activity 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.view.View$1.onClick(View.java:3599) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.view.View.performClick(View.java:4204) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.view.View$PerformClick.run(View.java:17355) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.os.Handler.handleCallback(Handler.java:725) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.os.Handler.dispatchMessage(Handler.java:92) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.os.Looper.loop(Looper.java:137) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.app.ActivityThread.main(ActivityThread.java:5041) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at dalvik.system.NativeStart.main(Native Method) 
08-02 06:54:04.539: E/AndroidRuntime(1453): Caused by: java.lang.reflect.InvocationTargetException 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at java.lang.reflect.Method.invokeNative(Native Method) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at java.lang.reflect.Method.invoke(Method.java:511) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at android.view.View$1.onClick(View.java:3594) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  ... 11 more 
08-02 06:54:04.539: E/AndroidRuntime(1453): Caused by: java.lang.NullPointerException 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at example.showevent1.FirstActivity.getName(FirstActivity.java:57) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at example.showevent1.DatabaseHandler.addContact(DatabaseHandler.java:63) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  at example.showevent1.FirstActivity.add_data(FirstActivity.java:64) 
08-02 06:54:04.539: E/AndroidRuntime(1453):  ... 14 more

來源

2013-08-02 sadabmkp

發佈您的logcat – ianhanniballake

爲什麼你需要構造函數的活動？刪除這個：'公共FirstActivity（TextView userSelection2，EditText userText2）'塊。 –

java.lang.ClassCastException：android.widget.Button無法轉換爲android.widget.EditText，清楚地顯示錯誤 –

嘗試清理項目。有時候在佈局變更後項目建設被打破。而且它將數據存儲在Activity類中是一個不好的做法，您應該創建一個新類來完成它。

來源

2013-08-02 06:39:38

@ianhanniballake我編輯的程序。新的logcat發佈 – sadabmkp

檢查您的logcat android.widget.Button cannot be cast to android.widget.EditText

轉到此錯誤信息到你的FirstActivity.java線36。在那裏，你會試圖像

userText = (EditText) findViewById(R.id.editText1);

這裏R.id.editText1似乎是類型的按鈕。在這種情況下檢查您是否使用了正確的ID，因爲您在XML佈局文件中指定的名稱與您嘗試使用的名稱相同。

來源

2013-08-02 06:41:53 midhunhk

我編輯的程序。新的logcat被髮布 – sadabmkp

在'FirstActivity.getName（FirstActivity.java:57）的空指針'那是什麼？ – midhunhk

我編輯的程序。新的logcat發佈了 – sadabmkp

構造函數分配userSelection和userText自己，而不是值傳遞：

public FirstActivity(TextView userSelection2, EditText userText2) { 
    // TODO Auto-generated constructor stub 
    this.userSelection=userSelection; 
    this.userText=userText; 
}

這是造成你看空指針，因爲你正在創建與構造一個新的活動，但不分配你給它的價值。

第1步：擺脫Activity構造函數。您不應該使用Activity的新實例作爲某些聯繫人數據的持有者，並且會導致這種級聯的一系列異常。

而不是傳入整個Activity，只傳入要保存到數據庫的TextView或EditTexts的String值，或者創建一個新的「Contact」類來保存該狀態。

來源

2013-08-02 12:50:37

應用程序結束按鈕點擊

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