Java 尝试从数据库捕获值并在文本视图中显示时出错。安卓_Java_Android_Sqlite

Java 尝试从数据库捕获值并在文本视图中显示时出错。安卓

java android sqlite

Java 尝试从数据库捕获值并在文本视图中显示时出错。安卓,java,android,sqlite,Java,Android,Sqlite,我有一个sqllite数据库。我试图从数据库中捕获值并在文本视图中显示它。我得到以下错误这行有错误 TextView result = (TextView) findViewById(R.id.textviewres); 完整错误堆栈 02-10 21:24:53.986: E/AndroidRuntime(27992): FATAL EXCEPTION: main 02-10 21:24:53.986: E/AndroidRuntime(27992): java.lang.RuntimeE

我有一个sqllite数据库。我试图从数据库中捕获值并在文本视图中显示它。我得到以下错误

这行有错误

TextView result = (TextView) findViewById(R.id.textviewres);

完整错误堆栈

02-10 21:24:53.986: E/AndroidRuntime(27992): FATAL EXCEPTION: main
02-10 21:24:53.986: E/AndroidRuntime(27992): java.lang.RuntimeException: Unable to start activity ComponentInfo{lk.adspace.jaffnatemples/lk.adspace.jaffnatemples.Db_results}: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread.access$600(ActivityThread.java:162)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.os.Handler.dispatchMessage(Handler.java:107)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.os.Looper.loop(Looper.java:194)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread.main(ActivityThread.java:5371)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at java.lang.reflect.Method.invokeNative(Native Method)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at java.lang.reflect.Method.invoke(Method.java:525)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at dalvik.system.NativeStart.main(Native Method)
02-10 21:24:53.986: E/AndroidRuntime(27992): Caused by: java.lang.ClassCastException: android.widget.RelativeLayout cannot be cast to android.widget.TextView
02-10 21:24:53.986: E/AndroidRuntime(27992):    at lk.adspace.jaffnatemples.Db_results.onCreate(Db_results.java:52)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.Activity.performCreate(Activity.java:5122)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
02-10 21:24:53.986: E/AndroidRuntime(27992):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
02-10 21:24:53.986: E/AndroidRuntime(27992):    ... 11 more

DB处理程序类..

    package lk.adspace.jaffnatemples;



    import java.util.ArrayList;


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

    import android.database.sqlite.SQLiteOpenHelper;
    import android.util.Log;

    public class Dbhandler extends SQLiteOpenHelper  {


        private static final int DATABASE_VERSION = 1;

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

        // Temple table name
        private static final String TABLE_TEMPLE = "templ";


        // Contacts Table Columns names
        private static final String KEY_ID = "id";
        private static final String KEY_TMPNAME = "temple_name";
        private static final String KEY_TMPTYPE = "temple_type";
        private static final String KEY_LATITUDE = "latitude";
        private static final String KEY_LONGITUDE = "longitude";
        private static final String KEY_IMGNAME = "image_name";
        private static final String KEY_YEARBUILD = "year_build";
        private static final String KEY_ADDRESS = "address";
        private static final String KEY_CITY = "city";
        private static final String KEY_EMAIL = "email";
        private static final String KEY_WEB = "website";
        private static final String KEY_TEL1 = "telephone1";
        private static final String KEY_TEL2 = "telephone2";
        private static final String KEY_DESCRI = "Description";
        private final ArrayList<kovil> temple_list = new ArrayList<kovil>();


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



        // Creating Tables
        @Override
        public void onCreate(SQLiteDatabase db) {
        String CREATE_TEMPLE_TABLE = "CREATE TABLE " + TABLE_TEMPLE + "("
            + KEY_ID + " INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL," + KEY_TMPNAME + " TEXT," + KEY_TMPTYPE + " TEXT," + KEY_LATITUDE + " TEXT," + KEY_LONGITUDE + " TEXT," + KEY_IMGNAME + " TEXT,"
            + KEY_YEARBUILD + " TEXT," + KEY_ADDRESS + " TEXT," + KEY_CITY + " TEXT," + KEY_EMAIL + " TEXT," + KEY_WEB + " TEXT," + KEY_TEL1 + " TEXT," + KEY_TEL2 + " TEXT,"
            + KEY_DESCRI + " TEXT" + ")";
        db.execSQL(CREATE_TEMPLE_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_TEMPLE);

        // Create tables again
        onCreate(db);
        }



        // Adding new temple
        public void Add_Temple(kovil Kovil) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();

        values.put(KEY_TMPNAME, Kovil.gettemplename()); 
        values.put(KEY_TMPTYPE, Kovil.gettempletype()); 
        values.put(KEY_LATITUDE, Kovil.getlatitude()); 
        values.put(KEY_LONGITUDE, Kovil.getlongitude()); 
        values.put(KEY_IMGNAME, Kovil.getimage_name()); 
        values.put(KEY_YEARBUILD, Kovil.getyear_build()); 
        values.put(KEY_ADDRESS, Kovil.getaddress()); 
        values.put(KEY_CITY, Kovil.getcity()); 
        values.put(KEY_EMAIL, Kovil.getemail()); 
        values.put(KEY_WEB, Kovil.getwebsite()); 
        values.put(KEY_TEL1, Kovil.gettelephone1()); 
        values.put(KEY_TEL2, Kovil.gettelephone2());
        values.put(KEY_DESCRI, Kovil.getDescription());

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






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

        Cursor cursor = db.query(TABLE_TEMPLE, new String[] { KEY_ID,
                KEY_TMPNAME, KEY_TMPTYPE, KEY_LATITUDE, KEY_LONGITUDE, KEY_IMGNAME, KEY_YEARBUILD, KEY_ADDRESS, KEY_CITY, KEY_EMAIL, KEY_EMAIL, KEY_WEB, KEY_TEL1, KEY_TEL2, KEY_DESCRI }, KEY_ID + "=?",
            new String[] { String.valueOf(id) }, null, null, null, null);
        if (cursor != null)
            cursor.moveToFirst();

        kovil Kovil = new kovil(Integer.parseInt(cursor.getString(0)),
            cursor.getString(1), cursor.getString(2), cursor.getString(3), cursor.getString(4), cursor.getString(5), cursor.getString(6), cursor.getString(7), cursor.getString(8), cursor.getString(9), cursor.getString(10), cursor.getString(11), cursor.getString(12), cursor.getString(13));
        // return contact
        cursor.close();
        db.close();

        return Kovil;
        }





        // Getting All Contacts
        public ArrayList<kovil> Get_Temple() {
        try {
            temple_list.clear();

            // Select All Query
            String selectQuery = "SELECT  * FROM " + TABLE_TEMPLE;

            SQLiteDatabase db = this.getWritableDatabase();
            Cursor cursor = db.rawQuery(selectQuery, null);
            System.out.print("CALLED");
            // looping through all rows and adding to list
            if (cursor.moveToFirst()) {
            do {
                kovil Kovil = new kovil();
                Kovil.setID(Integer.parseInt(cursor.getString(0)));
                System.out.print("CALLED"+cursor.getString(0));
                Kovil.settemplename(cursor.getString(1)); 
                Kovil.settempletype(cursor.getString(2)); 
                Kovil.setlatitude(cursor.getString(3)); 
                Kovil.setlongitude(cursor.getString(4)); 
                Kovil.setimage_name(cursor.getString(5)); 
                Kovil.setyear_build(cursor.getString(6)); 
                Kovil.setaddress(cursor.getString(7)); 
                Kovil.setcity(cursor.getString(8)); 
                Kovil.setemail(cursor.getString(9)); 
                Kovil.setwebsite(cursor.getString(10)); 
                Kovil.settelephone1(cursor.getString(11)); 
                Kovil.settelephone2(cursor.getString(12));
                Kovil.setDescription(cursor.getString(13));



                // Adding contact to list
                temple_list.add(Kovil);
            } while (cursor.moveToNext());
            }

            // return contact list
            cursor.close();
            db.close();
            return temple_list;
        } catch (Exception e) {
            // TODO: handle exception
            Log.e("all_temples", "" + e);
        }

        return temple_list;
        }

        public String collect(){

            SQLiteDatabase ourDatabase = this.getWritableDatabase();
            String result="";
            String []column =new String[]{KEY_ID,KEY_TMPNAME,KEY_TMPTYPE,KEY_LATITUDE,KEY_LONGITUDE,KEY_IMGNAME,KEY_YEARBUILD,KEY_ADDRESS,KEY_CITY,KEY_EMAIL,KEY_WEB,KEY_TEL1,KEY_TEL2,KEY_DESCRI};
            Cursor c=ourDatabase.query("templ", column, null, null, null, null,null, null);
            //Cursor c=ourDatabase.query(
            c.moveToFirst();
            int iKEY_ID = c.getColumnIndex(KEY_ID);
            int iKEY_TMPNAME= c.getColumnIndex(KEY_TMPNAME);
            int iKEY_TMPTYPE= c.getColumnIndex(KEY_TMPTYPE);
            for (c.moveToFirst();!c.isAfterLast();c.moveToNext()){
                //for (int x=0;x<5;x++){
            result = result+c.getString(iKEY_ID)+"  "+c.getString(iKEY_TMPNAME)+" \t\t\t\t"+c.getString(iKEY_TMPTYPE)+" \n";
            }
            return result;

        }


        // Getting contacts Count
        public int Get_Total_Temple() {
            String countQuery = "SELECT * FROM " + TABLE_TEMPLE;
            SQLiteDatabase db = this.getReadableDatabase();
            Cursor cursor = db.rawQuery(countQuery, null);
            int count = cursor.getCount();
            cursor.close();
            db.close();
            return count;
        }


    }

有人能帮我修复这个错误吗。

请发布您的xml布局或检查这行是否正确：

TextView result = (TextView) findViewById(R.id.textviewres);

id为

textviewres

的视图真的是

TextView

？根据logcat，它看起来像是

RelativeLayout

您有重复的视图id。请尝试使用此布局：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true" >

    </ListView>

    <TextView
        android:id="@+id/textviewres"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="38dp"
        android:text="TextView" />

</RelativeLayout>

从中删除ID

相对布局和文本视图都具有相同的id，当您在“活动”中获取该id时，它将返回相对布局对象

将其从相对布局中删除，只需将其保留在代码的文本视图中即可： convertView=mInflater.充气（右布局.显示结果，父项，假）；

您需要对仅包含TextView的布局进行充气

我已经发布了XML布局。你能检查一下并告诉我错误是什么吗？。谢谢。小鸟。但这样做之后，我得到了一个新的错误。我已经编辑了这个问题，你能帮我修正这个错误吗？谢谢vipul mittal。但这样做之后，我得到了新的错误。我已经在问题中添加了新的错误，您是否也可以帮助修复该错误..尝试清理您的项目并运行b'coz id list是一个列表视图，您正在正确地强制转换它。如果你仍然有问题，一定要把你遇到问题的那一行写出来

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/textviewres"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <ListView
            android:id="@+id/list"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true" >

        </ListView>

        <TextView
            android:id="@+id/textviewres"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:text="TextView" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="38dp"
            android:text="TextView" />

    </RelativeLayout>

02-10 21:45:31.473: E/AndroidRuntime(31356): FATAL EXCEPTION: main
02-10 21:45:31.473: E/AndroidRuntime(31356): java.lang.RuntimeException: Unable to start activity ComponentInfo{lk.adspace.jaffnatemples/lk.adspace.jaffnatemples.Db_results}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.ListView
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2343)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2395)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.ActivityThread.access$600(ActivityThread.java:162)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.os.Handler.dispatchMessage(Handler.java:107)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.os.Looper.loop(Looper.java:194)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.ActivityThread.main(ActivityThread.java:5371)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at java.lang.reflect.Method.invokeNative(Native Method)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at java.lang.reflect.Method.invoke(Method.java:525)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at dalvik.system.NativeStart.main(Native Method)
02-10 21:45:31.473: E/AndroidRuntime(31356): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.ListView
02-10 21:45:31.473: E/AndroidRuntime(31356):    at lk.adspace.jaffnatemples.Db_results.onCreate(Db_results.java:36)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.Activity.performCreate(Activity.java:5122)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1081)
02-10 21:45:31.473: E/AndroidRuntime(31356):    at  android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)
02-10 21:45:31.473: E/AndroidRuntime(31356):    ... 11 more

TextView result = (TextView) findViewById(R.id.textviewres);

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true" >

    </ListView>

    <TextView
        android:id="@+id/textviewres"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="38dp"
        android:text="TextView" />

</RelativeLayout>

 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/textviewres"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >