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我是一個新的android開發人員。由於這個原因，我有一些大問題，我沒有繼續我的項目。我想獲取聯繫人信息，然後將這些信息設置爲sqlite。這一步工作，但是當我嘗試在列表視圖中列出不要在這裏工作是我的代碼可以幫助我嗎？Android簡單數據庫適配器不工作
這是我行佈局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="#FFDAFF7F"
android:padding="8dp">
<LinearLayout android:id="@+id/Text"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="10dip">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FF7F3300"
android:textSize="20dip"
android:textStyle="italic"
/>
<TextView
android:id="@+id/phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="14dip"
android:textColor="#FF267F00"
android:paddingLeft="100dip"
/>
</LinearLayout>
</RelativeLayout >
這是我的活動佈局
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<ListView
android:id="@id/android:list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</LinearLayout>
這是我的SQLite代碼
package com.example.myprojects;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class contacts_nick {
//private static final String TAG = contacts_nick.class.getSimpleName();
public static final String KEY_ID="id";
public static final String KEY_NAME="name";
public static final String KEY_PHONE="phone";
public static final String KEY_NICK="nick";
private static final String DATABASE_NAME="mydatabase";
private static final String DATABASE_TABLE="Contacts";
private static final int DATABASE_VERSION=1;
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
//To create db
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " +DATABASE_TABLE+ " (" +KEY_ID+ " INTEGER PRIMARY KEY AUTOINCREMENT, "+KEY_NAME+" TEXT, "+KEY_PHONE+" TEXT, "+KEY_NICK+" TEXT);");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public contacts_nick(Context c){
ourContext=c;
}
public contacts_nick open() throws SQLException{
ourHelper=new DbHelper(ourContext);
ourDatabase=ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public long insert (String displayName, String phoneNumber) throws SQLException {
ContentValues cv=new ContentValues();
cv.put(KEY_NAME, displayName);
cv.put(KEY_PHONE, phoneNumber);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public String getData() throws SQLException {
// TODO Auto-generated method stub
String[] columns =new String[]{KEY_ID,KEY_NAME,KEY_PHONE};
Cursor c=ourDatabase.query(DATABASE_TABLE, columns, null, null, null, null, null);
String result="";
int id=c.getColumnIndex(KEY_ID);
int name=c.getColumnIndex(KEY_NAME);
int phone=c.getColumnIndex(KEY_PHONE);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
result=result+c.getString(id)+","+c.getString(name)+" "+c.getString(phone)+"\n";
}
return result;
}
public String search(int l) throws SQLException{
String[] columns =new String[]{KEY_ID,KEY_NAME,KEY_PHONE};
Cursor c=ourDatabase.query(DATABASE_TABLE, columns,KEY_ID +"="+l, null, null, null, null);
if(c!=null){
c.moveToFirst();
String name=c.getString(1);
return name;
}
return null;
}
public int getrowcount(String name,String phone){
int result;
String[] columns =new String[]{KEY_ID,KEY_NAME,KEY_PHONE};
Cursor c=ourDatabase.query(DATABASE_TABLE, columns,KEY_NAME +"="+"'"+name+"'"+" AND "+KEY_PHONE+"="+ "'"+phone+"'", null, null, null, null);
result=c.getCount();
return result;
}
public void update(long id, String name, String phone) throws SQLException{
ContentValues cvUpdate=new ContentValues();
cvUpdate.put(KEY_ID,id);
cvUpdate.put(KEY_NAME,name);
cvUpdate.put(KEY_PHONE,phone);
ourDatabase.update(DATABASE_TABLE, cvUpdate, KEY_ID+"="+id, null);
}
public void delete(long l) throws SQLException{
ourDatabase.delete(DATABASE_TABLE, KEY_ID+"="+l, null);
}
public Cursor getAllData() {
ourDatabase=ourHelper.getReadableDatabase();
String[] columns =new String[]{KEY_ID,KEY_NAME,KEY_PHONE};
Cursor cur=ourDatabase.query(DATABASE_TABLE,columns, null,null, null, null, null);
return cur;
}
}
，這是我main_activity
package com.example.myprojects;
import android.app.Dialog;
import android.app.ListActivity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.widget.SimpleCursorAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
public class edit_contacts extends ListActivity {
cursor customadapter;
TextView contactView;
TextView s1;
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
contactView = (TextView) findViewById(R.id.textView1);
s1=(TextView)findViewById(R.id.textView2);
list=(ListView)findViewById(android.R.id.list);
boolean diditwork=true;
try{
Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null,null,null, null);
while (cursor.moveToNext()) {
String displayName = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phoneNumber = cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
contacts_nick entry=new contacts_nick(this);
entry.open();
if(entry.getrowcount(displayName,phoneNumber)==0){
entry.insert(displayName,phoneNumber);
entry.close();
}
else{
Dialog d=new Dialog(this);
d.setTitle("Error");
TextView tv=new TextView(this);
tv.setText("KAYIT VAR");
d.setContentView(tv);
d.show();
entry.close();
}
}
}
catch(Exception e){
diditwork=false;
String error =e.toString();
Dialog d=new Dialog(this);
d.setTitle("Sorun Var");
TextView tv=new TextView(this);
tv.setText(error);
d.setContentView(tv);
d.show();
}
finally{
if(diditwork){
Dialog d=new Dialog(this);
d.setTitle("Tebrikler");
TextView tv=new TextView(this);
tv.setText("Başaralı");
d.setContentView(tv);
d.show();
}
}
contacts_nick info=new contacts_nick(this);
Cursor c = info.getAllData();
String[] columns = new String[] { contacts_nick.KEY_ID, contacts_nick.KEY_NAME,contacts_nick.KEY_PHONE };
int[] to = new int[] { R.id.name, R.id.phone };
//@SuppressWarnings("deprecation")
ListAdapter simpCurAdap = new SimpleCursorAdapter(this, R.layout.activity_row, c, columns, to,0);
setListAdapter(simpCurAdap);
}
}
請從logcat中添加錯誤的詳細信息 –