我使用 GreenDao 作为我的 ORM。我想将架构从旧版本迁移到新版本。我使用此链接来实现我的 mygration。所以我编写了自己的 OpenHelper 类并将其放入另一个包中。我像这样实现 onUpgrade 方法：
public class UpgradeHelper extends OpenHelper {
public UpgradeHelper(Context context, String name, CursorFactory factory) {
super(context, name, factory);
}
/**
* Apply the appropriate migrations to update the database.
*/
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.i("greenDAO", "My Upgrade Helper -------- Upgrading schema from version " + oldVersion + " to " + newVersion + " by dropping all tables");
switch (newVersion) {
case 2:
new …我正在尝试实现滑动动画从fragment1转换到fragment2.我正在使用setCustomAnimations方法.我知道我需要使用frame方法来替换片段.
我的代码:
package com.example.fragmentss;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
public class MainActivity extends Activity implements MyListFragment.OnItemSelectedListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_rsslist_overview);
}
// if the wizard generated an onCreateOptionsMenu you can delete
// it, not needed for this tutorial
@Override
public void onRssItemSelected(String link) {
}
}
activity_main.xml中
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<fragment
android:id="@+id/listFragment"
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="match_parent"
class="com.example.fragmentss.MyListFragment" ></fragment>
<FrameLayout android:id="@+id/details" android:layout_weight="1"
android:layout_width="0px" android:layout_height="match_parent"
android:background="?android:attr/detailsElementBackground" />
</LinearLayout>
MyListFragment类
package com.example.fragmentss;
import …