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昨天我發佈了一個類似的問題，爲什麼我的代碼在我的內容提供者類而不是主類上開始，我收到了一些我已更新的反饋，但問題仍然存在仍然是代碼以ContentProvider類而不是主類開始的位置。我已經通過調試器運行代碼，它令人困惑，爲什麼代碼在Content Provider中開始並在Context階段傳回主類。我希望在這裏尋求幫助！從ContentProvider類開始而不是從Main類開始的Android代碼
主類是在這裏：
public class MedF1 extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.drug_list);
ListView drugListView;
ArrayAdapter<Drug> aa;
ArrayList<Drug> drugs = new ArrayList<Drug>();
drugListView = (ListView)this.findViewById(R.id.list1);
DrugProvider.DatabaseHelper mDbHelper1 = new DrugProvider.DatabaseHelper(this);
//Creation of the Database here
try {
mDbHelper1.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
mDbHelper1.openDataBase();
}catch(SQLException sqle){
throw sqle;
}
內容提供商等級如下表所示。
public class DrugProvider extends ContentProvider {
// publishing the URI for this provider
public static final Uri CONTENT_URI = Uri
.parse("content://com.paad.provider.drug/drugs");
private static final int DRUGS = 1;
private static final int DRUG_ID = 2;
private static final UriMatcher uriMatcher;
// allocating UriMatcher object
static {
uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
uriMatcher.addURI("com.paad.provider.drug", "drugs", DRUGS);
uriMatcher.addURI("com.paad.provider.drug", "drugs/#", DRUG_ID);
}
// Column names
public static final String KEY_ROWID = "_id";
public static final String KEY_DRUG = "drug";
public static final String KEY_CONTENT = "content";
public static final String KEY_INDICATION = "indication";
public static final String KEY_DOSAGE = "dosage";
public static final String KEY_SPECIALPRECAUTION = "specialprecaution";
// Column indexes
public static final int DRUG_COLUMN = 1;
public static final int CONTENT_COLUMN = 2;
public static final int INDICATION_COLUMN = 3;
public static final int DOSAGE_COLUMN = 4;
public static final int SPECIALPRECAUTION_COLUMN = 5;
// private DatabaseHelper mDbHelper;
// private SQLiteDatabase mDb;
private static String DB_PATH = "data/data/com.paad.MedF1/databases/";
private static String DB_NAME = "data";
private static final int DATABASE_VERSION = 1;
private static final String DRUG_TABLE = "drugs";
public static SQLiteDatabase myDataBase;
// Creation of the database and its basic parameters
public static class DatabaseHelper extends SQLiteOpenHelper {
public final Context myContext;
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
}