java.lang.IllegalStateException：无法执行活动的方法。
我是Android新手。想要从数据库中显示存储的数据 这是我的Compview类，它正在收到错误。
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.compview);
DB = (new DBHelper(this)).getWritableDatabase();
// searchText = (EditText) findViewById (R.id.searchText);
eun = (TextView)findViewById(R.id.textV);
Bundle bundle = getIntent().getExtras();
String UName = bundle.getString("UserName");
eun.setText(UName);
}
public void search(View view)
{DB.isReadOnly();
cursor = DB.rawQuery("SELECT _id, Cname, Cpost, Ccriteria, Cemail,Ccontact,Ccutoff FROM Comp WHERE Cusername LIKE ?",
new String[] {"%" + eun.getText().toString() + "%"});
adapter = new SimpleCursorAdapter(
this,
R.layout.cmpinfo,
cursor,
new String[] {" Cname", "Cpost", "Ccriteria", "Cemail","Ccontact","Ccutoff"},
new int[] {R.id.cname, R.id.cpost, R.id.ccriteria , R.id.cemail, R.id.ccontact, R.id.ccutoff});
setListAdapter(adapter);
}
@Override
public void onBackPressed()
{
super.onBackPressed();
Intent i = new Intent(CompView.this, LoginActivity.class);
startActivity(i);
}
}
logcat的
04-09 01:32:54.322: W/dalvikvm(4302): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
04-09 01:32:54.342: E/AndroidRuntime(4302): FATAL EXCEPTION: main
04-09 01:32:54.342: E/AndroidRuntime(4302): java.lang.IllegalStateException: Could not execute method of the activity
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.view.View$1.onClick(View.java:2072)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.view.View.performClick(View.java:2408)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.view.View$PerformClick.run(View.java:8816)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.os.Handler.handleCallback(Handler.java:587)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.os.Handler.dispatchMessage(Handler.java:92)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.os.Looper.loop(Looper.java:123)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.app.ActivityThread.main(ActivityThread.java:4627)
04-09 01:32:54.342: E/AndroidRuntime(4302): at java.lang.reflect.Method.invokeNative(Native Method)
04-09 01:32:54.342: E/AndroidRuntime(4302): at java.lang.reflect.Method.invoke(Method.java:521)
04-09 01:32:54.342: E/AndroidRuntime(4302): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-09 01:32:54.342: E/AndroidRuntime(4302): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-09 01:32:54.342: E/AndroidRuntime(4302): at dalvik.system.NativeStart.main(Native Method)
04-09 01:32:54.342: E/AndroidRuntime(4302): Caused by: java.lang.reflect.InvocationTargetException
04-09 01:32:54.342: E/AndroidRuntime(4302): at com.google.data.CompView.search(CompView.java:68)
04-09 01:32:54.342: E/AndroidRuntime(4302): at java.lang.reflect.Method.invokeNative(Native Method)
04-09 01:32:54.342: E/AndroidRuntime(4302): at java.lang.reflect.Method.invoke(Method.java:521)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.view.View$1.onClick(View.java:2067)
04-09 01:32:54.342: E/AndroidRuntime(4302): ... 11 more
04-09 01:32:54.342: E/AndroidRuntime(4302): Caused by: java.lang.IllegalArgumentException: column ' Cname' does not exist
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:314)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.widget.SimpleCursorAdapter.findColumns(SimpleCursorAdapter.java:312)
04-09 01:32:54.342: E/AndroidRuntime(4302): at android.widget.SimpleCursorAdapter.<init>(SimpleCursorAdapter.java:87)
04-09 01:32:54.342: E/AndroidRuntime(4302): ... 15 more
DBHelper类
public class DBHelper extends SQLiteOpenHelper
{
private SQLiteDatabase db;
public static final String KEY_ROWID = "_id";
public static final String KEY_ROWID1 = "_id";
public static final String KEY_FNAME = "firstname";
public static final String KEY_LNAME = "lastname";
public static final String KEY_GENDER = "gender";
public static final String KEY_USER = "username";
public static final String KEY_EMAIL = "email";
public static final String KEY_CNAME="Cname";
public static final String KEY_CPOST="Cpost";
public static final String KEY_CCRITERIA="Ccriteria";
public static final String KEY_CUSER="Cusername";
public static final String KEY_CEMAIL="Cemail";
public static final String KEY_CCONTACT="Ccontact";
public static final String KEY_CCUTOFF="Ccutoff";
DBHelper DB = null;
private static final String DATABASE_NAME = "Sam1.db";
private static final int DATABASE_VERSION = 2;
public static final String DATABASE_TABLE_NAME = "JobSeeker";
public static final String Company_Table = "Comp";
private static final String DATABASE_TABLE_CREATE =
"CREATE TABLE " + DATABASE_TABLE_NAME + "(" +
"_id INTEGER PRIMARY KEY AUTOINCREMENT,"+
"firstname TEXT NOT NULL, lastname TEXT NOT NULL, gender TEXT NOT NULL, username TEXT NOT NULL, password TEXT NOT NULL, email TEXT NOT NULL);";
private static final String DATABASE_TABLE_CREATE2=
" create table " + Company_Table +
" (_id integer primary key autoincrement," +
" Cname TEXT NOT NULL, Cpost TEXT NOT NULL,Ccriteria TEXT NOT NULL,Cusername TEXT NOT NULL, Cpassword TEXT NOT NULL, Cemail TEXT NOT NULL,Ccontact TEXT NOT NULL,Ccutoff TEXT NOT NULL);" ;
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
System.out.println("In constructor");
}
@Override
public void onCreate(SQLiteDatabase db) {
try{
db.execSQL(DATABASE_TABLE_CREATE);
db.execSQL(DATABASE_TABLE_CREATE2);
}catch(Exception e){
e.printStackTrace();
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
}
public Cursor rawQuery(String string, String[] strings) {
// TODO Auto-generated method stub
return null;
}
public void open() {
getWritableDatabase();
}
public Cursor getDetails(String text) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE_NAME,
new String[]{KEY_ROWID, KEY_FNAME, KEY_LNAME, KEY_GENDER, KEY_USER, KEY_EMAIL},
KEY_USER + "=" + text,
null, null, null, null, null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
public Cursor getCompDetails(String text) throws SQLException
{
Cursor mCursor =
db.query(true, Company_Table,
new String[]{KEY_ROWID1, KEY_CNAME, KEY_CPOST, KEY_CCRITERIA, KEY_CUSER, KEY_EMAIL,KEY_CCONTACT,KEY_CCUTOFF},
KEY_CUSER + "=" + text,
null, null, null, null, null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
}
这是我的welcome1类，它工作正常并且能够从数据库中检索所有数据，但是当我使用相同的方法为我的compview类访问数据时它不起作用。!!
public class Welcome1 extends ListActivity
{
protected TextView eun;
protected SQLiteDatabase DB;
protected Cursor cursor;
protected ListAdapter adapter;
protected TextView mUname;
protected TextView mFname;
protected TextView mLname;
protected TextView mEmail;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.welcome1);
DB = (new DBHelper(this)).getWritableDatabase();
// searchText = (EditText) findViewById (R.id.searchText);
eun = (TextView)findViewById(R.id.textV);
Bundle bundle = getIntent().getExtras();
String UName = bundle.getString("UserName");
eun.setText(UName);
}
public void search(View view)
{
cursor = DB.rawQuery("SELECT _id, firstname, lastname, gender, username, email FROM JobSeeker WHERE username LIKE ?",
new String[] {"%" + eun.getText().toString() + "%"});
adapter = new SimpleCursorAdapter(
this,
R.layout.dtl,
cursor,
new String[] {"firstname", "lastname", "gender","username", "email"},
new int[] {R.id.sfname, R.id.slname, R.id.sgender , R.id.suname, R.id.semail});
setListAdapter(adapter);
}
@Override
public void onBackPressed()
{
super.onBackPressed();
Intent i = new Intent(Welcome1.this, LoginActivity.class);
startActivity(i);
}
}
答案 0 :(得分：1)
创建from
adapter参数
adapter = new SimpleCursorAdapter(
this,
R.layout.cmpinfo,
cursor,
new String[] {" Cname", "Cpost", "Ccriteria", "Cemail","Ccontact","Ccutoff"},
new int[] {R.id.cname, R.id.cpost, R.id.ccriteria , R.id.cemail, R.id.ccontact, R.id.ccutoff});
查看您在哪里创建String[]数组...
new String[] {" Cname", "Cpost", "Ccriteria", "Cemail","Ccontact","Ccutoff"}
... space之前有Cname。
logact输出显示了这个......
column ' Cname' does not exist