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我使用SugarORM來管理好友列表SugarORM更新
AndroidManifest.xml中
<application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme" android:name="com.orm.SugarApp"> <meta-data android:name="DATABASE" android:value="myfriends.db" /> <meta-data android:name="VERSION" android:value="2" /> <meta-data android:name="QUERY_LOG" android:value="true" /> <meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="com.example" /> <activity android:name=".MainActivity" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application>Friend.java
public class Friend extends SugarRecord{ int recID; String name; String phone; public Friend(){} public Friend(int rec, String n, String p) { this.recID = rec; this.name = n; this.phone = p; } @Override public String toString() { return "[" + recID + ", " + name + ", " + phone + "]"; } }activity_main.xml中
<Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Insert" android:id="@+id/buttonInsert" android:layout_alignParentTop="true" android:layout_alignParentStart="true" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Delete" android:id="@+id/buttonDelete" android:layout_alignTop="@+id/buttonInsert" android:layout_toEndOf="@+id/buttonInsert" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Update" android:id="@+id/buttonUpdate" android:layout_alignTop="@+id/buttonDelete" android:layout_toEndOf="@+id/buttonDelete" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editTextID" android:hint="Enter ID to update or delete" android:layout_below="@+id/buttonInsert" android:layout_alignParentStart="true" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editTextName" android:hint="Enter new name" android:layout_below="@+id/editTextID" android:layout_alignParentStart="true" /> <ScrollView android:layout_width="match_parent" android:layout_height="500dp" android:background="@color/abc_search_url_text_normal" android:id="@+id/scrollView" android:layout_below="@+id/editTextName" android:layout_alignParentStart="true" > <TextView android:layout_width="match_parent" android:layout_height="match_parent" android:layout_margin="10dp" android:text="" android:id="@+id/textView" /> </ScrollView> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Show" android:id="@+id/buttonShow" android:layout_alignBottom="@+id/buttonUpdate" android:layout_toEndOf="@+id/buttonUpdate" /> <EditText android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/editTextPhone" android:hint="Enter new phone" android:layout_above="@+id/scrollView" android:layout_alignEnd="@+id/scrollView" />MainActivity.java
public class MainActivity extends Activity implements View.OnClickListener { SQLiteDatabase db; TextView txtMsg; Button btnInsert; Button btnDelete; Button btnUpdate; Button btnShow; EditText edtID; EditText edtName; EditText edtPhone; // id static int id = 0; // Friends list List<Friend> friendList; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //initializeTable(); resetTable(); getWidgets(); } private void resetTable() { Friend.deleteAll(Friend.class); } // Get friend list private List<Friend> getFriendList() { return Friend.listAll(Friend.class); } // Show to textView private void show() { txtMsg.setText(""); friendList = getFriendList(); txtMsg.append("[ID, Name, Phone]"); for (int i = 0; i < friendList.size(); i++) { txtMsg.append("\n[" + friendList.get(i).recID + ", " + friendList.get(i).name + ", " + friendList.get(i).phone + "]"); } } private void getWidgets() { txtMsg = (TextView) findViewById(R.id.textView); edtID = (EditText) findViewById(R.id.editTextID); edtName = (EditText) findViewById(R.id.editTextName); edtPhone = (EditText)findViewById(R.id.editTextPhone); btnInsert = (Button) findViewById(R.id.buttonInsert); btnDelete = (Button) findViewById(R.id.buttonDelete); btnUpdate = (Button) findViewById(R.id.buttonUpdate); btnShow = (Button) findViewById(R.id.buttonShow); btnInsert.setOnClickListener(this); btnDelete.setOnClickListener(this); btnUpdate.setOnClickListener(this); btnShow.setOnClickListener(this); } // insert private void insert() { txtMsg.setText(""); try { Friend f = new Friend(++id, edtName.getText().toString(), edtPhone.getText().toString()); f.save(); txtMsg.setText("Insert successfully"); txtMsg.append(f.toString()); } catch (Exception e) { txtMsg.setText(e.toString()); } } // delete private void delete() { txtMsg.setText(""); int pos = -1; try { try { pos = Integer.parseInt(edtID.getText().toString()); } catch (Exception e) { txtMsg.setText(e.toString()); } Friend f = Friend.findById(Friend.class, pos); f.delete(); txtMsg.setText("Delete successfully"); } catch(Exception e) { txtMsg.setText(e.toString()); } } // update private void update() { txtMsg.setText(""); long pos = -1; try { try { pos = Long.parseLong(edtID.getText().toString()); Toast.makeText(this, String.valueOf(pos), Toast.LENGTH_SHORT).show(); } catch (Exception e) { txtMsg.setText(e.toString()); } Friend f = SugarRecord.findById(Friend.class, pos); f.name = edtName.getText().toString(); f.phone = edtPhone.getText().toString(); f.save(); txtMsg.setText("Update successfully"); txtMsg.append(f.toString()); } catch (Exception e) { txtMsg.setText(e.toString()); } } // Button click @Override public void onClick(View view) { if (view.getId() == btnShow.getId()) { show(); } else if (view.getId() == btnInsert.getId()) { insert(); } else if (view.getId() == btnUpdate.getId()) { update(); } else if (view.getId() == btnDelete.getId()) { delete(); } }的問題是，當我嘗試更新，我得到了錯誤。例如，我插入6行像下面
現在我在這裏更新行數2，錯誤！
提前感謝！