以下に示すメソッドの戻り値を別のアクティビティに取得する方法は?
// 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;
}
実際、これはリストビューですべての連絡先を取得するために使用する DatabasHandler クラスのメソッドです。したがって、VewContact.class (sqlite データベースからリストビューを作成する) でこの関数を呼び出したいと思います。戻り値は contactList です。関数内でどのように呼び出すことができますか? ご理解いただければ幸いです.. :)
追加 (連絡先の表示):
public class ViewContact extends Activity {
DatabaseHandler db = new DatabaseHandler(this);
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
db.getAllContacts();
populateListView();
}
private void populateListView() {
ArrayAdapter<Contact> adapter = new MyListAdapter();
ListView list = (ListView) findViewById(R.id.carsListView);
list.setAdapter(adapter);
}
private class MyListAdapter extends ArrayAdapter<Contact> {
public MyListAdapter() {
super(ViewContact.this, R.layout.item_view, db.getAllContacts());
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Make sure we have a view to work with (may have been given null)
View itemView = convertView;
if (itemView == null) {
itemView = getLayoutInflater().inflate(R.layout.item_view, parent, false);
}
// Find the car to work with.
Contact contact = db.getAllContacts().get(position);
// Make:
TextView makeText = (TextView) itemView.findViewById(R.id.item_txtMake);
makeText.setText(contact.getID());
// Year:
TextView yearText = (TextView) itemView.findViewById(R.id.item_txtYear);
yearText.setText("" + contact.getName());
// Condition:
TextView condionText = (TextView) itemView.findViewById(R.id.item_txtCondition);
condionText.setText(""+contact.getPhoneNumber());
return itemView;
}
}}
エラー (LogCat):
08-17 09:03:24.132: E/AndroidRuntime(17094): FATAL EXCEPTION: main
08-17 09:03:24.132: E/AndroidRuntime(17094): android.content.res.Resources$NotFoundException: String resource ID #0x1
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.content.res.Resources.getText(Resources.java:201)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.TextView.setText(TextView.java:2961)
08-17 09:03:24.132: E/AndroidRuntime(17094): at com.parth.targetthebudget.ViewContact$MyListAdapter.getView(ViewContact.java:51)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.AbsListView.obtainView(AbsListView.java:1593)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.ListView.measureHeightOfChildren(ListView.java:1251)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.ListView.onMeasure(ListView.java:1162)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.View.measure(View.java:8313)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:566)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:381)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.View.measure(View.java:8313)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.View.measure(View.java:8313)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.View.measure(View.java:8313)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.View.measure(View.java:8313)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.ViewRoot.performTraversals(ViewRoot.java:845)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.view.ViewRoot.handleMessage(ViewRoot.java:1865)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.os.Handler.dispatchMessage(Handler.java:99)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.os.Looper.loop(Looper.java:130)
08-17 09:03:24.132: E/AndroidRuntime(17094): at android.app.ActivityThread.main(ActivityThread.java:3687)
08-17 09:03:24.132: E/AndroidRuntime(17094): at java.lang.reflect.Method.invokeNative(Native Method)
08-17 09:03:24.132: E/AndroidRuntime(17094): at java.lang.reflect.Method.invoke(Method.java:507)
08-17 09:03:24.132: E/AndroidRuntime(17094): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
08-17 09:03:24.132: E/AndroidRuntime(17094): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
08-17 09:03:24.132: E/AndroidRuntime(17094): at dalvik.system.NativeStart.main(Native Method)
XML (item_view):
<?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" >
<TextView
android:id="@+id/item_txtMake"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:layout_marginLeft="22dp"
android:layout_marginTop="32dp"
android:text="Make Shown Here"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/item_txtYear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/item_txtMake"
android:layout_below="@+id/item_txtMake"
android:text="2000" />
<TextView
android:id="@+id/item_txtCondition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/item_txtYear"
android:layout_marginRight="16dp"
android:text="Condition shown here"
android:textSize="20dip" /></RelativeLayout>
XML (活動メイン):
<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:padding="20dp"
tools:context=".MainActivity" >
<TextView
android:id="@+id/txtMake"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:text="All My Cars"
android:textAppearance="?android:attr/textAppearanceLarge" />
<ListView
android:id="@+id/carsListView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/txtMake"
android:layout_below="@+id/txtMake" >
</ListView>
</RelativeLayout>