我成功地将数据插入到数据库中，但是当我尝试检索数据并在textView中显示时，它会被定向到MainActivity。
Regiser_page.java如下
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
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"
tools:context="no.nordicsemi.android.nrftoolbox.Register_Page">
<RelativeLayout
android:id="@+id/layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:orientation="vertical"
android:weightSum="1">
<TextView
android:id="@+id/register"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignEnd="@+id/editText_name"
android:layout_alignParentTop="true"
android:layout_marginLeft="100dp"
android:layout_marginTop="28dp"
android:layout_weight="0.36"
android:text="Register Here"
android:textAlignment="center"
android:textAllCaps="true"
android:textColor="#3333ff"
android:textSize="28dp" />
<Button
android:id="@+id/button_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="790dp"
android:onClick="mydata"
android:text="View data" />
<TextView
android:id="@+id/textView_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="70sp"
android:autoText="false"
android:text="Name :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10sp"
android:layout_marginRight="10sp"
android:layout_marginTop="100sp"
android:ems="10"
android:hint="Enter your name"
android:inputType="textPersonName" />
<TextView
android:id="@+id/textView_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="160sp"
android:text="Email-id :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10sp"
android:layout_marginRight="10sp"
android:layout_marginTop="190sp"
android:ems="10"
android:hint="Enter Email-id"
android:inputType="textEmailAddress" />
<TextView
android:id="@+id/textView_pass"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14dp"
android:layout_marginTop="250dp"
android:hint="Enter Password"
android:text="Password"
android:textColor="#3368ff"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_pass"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="280dp"
android:ems="10"
android:hint="Enter Password"
android:inputType="textPassword" />
<TextView
android:id="@+id/textView_dob"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="450sp"
android:text="Date of Birth :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_dob"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="480dp"
android:ems="10"
android:hint="Date of Birth"
android:inputType="date" />
<TextView
android:id="@+id/textView_phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="540sp"
android:text="Phone No. :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_phone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10sp"
android:layout_marginRight="10sp"
android:layout_marginTop="570sp"
android:ems="10"
android:hint="Enter Phone No."
android:inputType="phone" />
<TextView
android:id="@+id/textView_city"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="630sp"
android:text="City :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_city"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10sp"
android:layout_marginRight="10sp"
android:layout_marginTop="660sp"
android:ems="10"
android:hint="Enter your City"
android:inputType="textPersonName" />
<TextView
android:id="@+id/textView_gender"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="14sp"
android:layout_marginTop="340sp"
android:text="Gender :"
android:textColor="#3368ff"
android:textColorLink="#000000"
android:textSize="20sp" />
<EditText
android:id="@+id/editText_gender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="370dp"
android:ems="10"
android:hint="M/F/Others"
android:inputType="textPersonName" />
<Button
android:id="@+id/button_register"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:layout_marginLeft="110dp"
android:layout_marginTop="720dp"
android:background="#3368ff"
android:onClick="addUser"
android:text="Register"
android:textAlignment="center"
android:textColor="#ffffff" />
</RelativeLayout>
</android.support.v4.widget.NestedScrollView>
Activity_register_page.xml如下：
public class View_Profile extends AppCompatActivity {
TextView name, email, pass, phone, gender, city, dob;
int id_To_Update=0;
private no.nordicsemi.android.nrftoolbox.myDbAdapter mydb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view__profile);
name = (TextView) findViewById(R.id.textView_name);
phone = (TextView) findViewById(R.id.textView_phone);
email = (TextView) findViewById(R.id.textView_email);
pass = (TextView) findViewById(R.id.textView_pass);
gender = (TextView) findViewById(R.id.textView_gender);
dob = (TextView) findViewById(R.id.textView_dob);
city = (TextView) findViewById(R.id.textView_city);
mydb = new no.nordicsemi.android.nrftoolbox.myDbAdapter(this);
Cursor rs = mydb.getData(1);
id_To_Update = 1;
rs.moveToFirst();
String nam = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_NAME));
String phon = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_PHONE));
String emai = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_EMAIL));
String cit = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_CITY));
String gend = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_GENDER));
String pas = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_PASS));
String dobb = rs.getString(rs.getColumnIndex(mydb.CONTACTS_COLUMN_DOB));
if (!rs.isClosed()) {
rs.close();
}
name.setText((CharSequence)nam);
name.setFocusable(false);
name.setClickable(false);
email.setText((CharSequence)emai);
email.setFocusable(false);
email.setClickable(false);
pass.setText((CharSequence)pas);
pass.setFocusable(false);
pass.setClickable(false);
dob.setText((CharSequence)dobb);
dob.setFocusable(false);
dob.setClickable(false);
gender.setText((CharSequence)gend);
gender.setFocusable(false);
gender.setClickable(false);
phone.setText((CharSequence)phon);
phone.setFocusable(false);
phone.setClickable(false);
city.setText((CharSequence)cit);
city.setFocusable(false);
city.setClickable(false);
}
}
View_Profile.java如下：
public class myDbAdapter extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "MyDBName.db";
public static final String CONTACTS_TABLE_NAME = "contacts";
public static final String CONTACTS_COLUMN_ID = "id";
public static final String CONTACTS_COLUMN_NAME = "name";
public static final String CONTACTS_COLUMN_EMAIL = "email";
public static final String CONTACTS_COLUMN_PASS = "password";
public static final String CONTACTS_COLUMN_DOB = "date-of-birth";
public static final String CONTACTS_COLUMN_GENDER = "gender";
public static final String CONTACTS_COLUMN_PHONE="phone";
public static final String CONTACTS_COLUMN_CITY="city";
private HashMap hp;
public myDbAdapter(Context context) {
super(context, DATABASE_NAME , null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(
"create table contacts " +
"(id integer primary key, name text,email text,pass text, dob text,gender text,phone text,city text)"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS contacts");
onCreate(db);
}
public boolean insertContact (String name, String email, String pass, String dob,String gender,String phone,String city) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("email", email);
contentValues.put("password", pass);
contentValues.put("date-of-birth", dob);
contentValues.put("gender", gender);
contentValues.put("phone",phone);
contentValues.put("city",city);
db.insert("contacts", null, contentValues);
return true;
}
public Cursor getData(int id) {
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts where id="+id+"", null );
return res;
}
public int numberOfRows(){
SQLiteDatabase db = this.getReadableDatabase();
int numRows = (int) DatabaseUtils.queryNumEntries(db, CONTACTS_TABLE_NAME);
return numRows;
}
public boolean updateContact (Integer id, String name, String email, String pass, String dob,String gender,String phone,String city) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("email", email);
contentValues.put("password", pass);
contentValues.put("date-of-birth", dob);
contentValues.put("gender", gender);
contentValues.put("phone",phone);
contentValues.put("city",city);
db.update("contacts", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
return true;
}
public Integer deleteContact (Integer id) {
SQLiteDatabase db = this.getWritableDatabase();
return db.delete("contacts",
"id = ? ",
new String[] { Integer.toString(id) });
}
public ArrayList<String> getAllCotacts() {
ArrayList<String> array_list = new ArrayList<String>();
//hp = new HashMap();
SQLiteDatabase db = this.getReadableDatabase();
Cursor res = db.rawQuery( "select * from contacts", null );
res.moveToFirst();
while(res.isAfterLast() == false){
array_list.add(res.getString(res.getColumnIndex(CONTACTS_COLUMN_NAME)));
res.moveToNext();
}
return array_list;
}
}
myDbAdapter.java如下：
near "-": syntax error
Error inserting phone=5895346896 email=man@gmail.com name=my name gender=male password=47ufvjtio city=bangalore date-of-birth=30-02-95
android.database.sqlite.SQLiteException: near "-": syntax error (code 1): , while compiling: INSERT INTO contacts(phone,email,name,gender,password,city,date-of-birth) VALUES (?,?,?,?,?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1469)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
at no.nordicsemi.android.nrftoolbox.myDbAdapter.insertContact(myDbAdapter.java:60)
at no.nordicsemi.android.nrftoolbox.Register_Page.addUser(Register_Page.java:194)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at android.view.View$1.onClick(View.java:4020)
at android.view.View.performClick(View.java:4785)
at android.view.View$PerformClick.run(View.java:19888)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5276)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:911)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)
将View_Profile定向到MainActivity并导致结果显示失败的错误是什么？
我的日志文件显示以下错误：
{{1}}
insertContact代码中是否有任何错误？或者为什么这不起作用？
答案 0 :(得分：0)
添加新活动时，您必须在清单文件中注册它。您应该在项目清单文件中注册新活动。
<activity
android:name=".Register_Page"/>
<activity
android:name=".View_Profile"/>
在项目的清单文件中添加这两行代码。您必须在MainActivity的标记在清单文件中结束后添加它们。
答案 1 :(得分：0)
让我们说清楚：
***您正在创建包含“dob”列
的表格 @Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(
"create table contacts " +
"(id integer primary key, name text,email text,pass text, dob text,gender text,phone text,city text)"
);
}
***现在看看
public boolean insertContact (String name, String email, String pass, String dob,String gender,String phone,String city) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put("name", name);
contentValues.put("email", email);
contentValues.put("password", pass);
//contentValues.put("date-of-birth", dob);
// it should be "dob" instead of "date-of-birth"
contentValues.put("dob", dob);
// like this
contentValues.put("gender", gender);
contentValues.put("phone",phone);
contentValues.put("city",city);
db.insert("contacts", null, contentValues);
return true;
}
**也在这里做出改变
// public static final String CONTACTS_COLUMN_DOB = "date-of-birth";
// as
public static final String CONTACTS_COLUMN_DOB = "dob";