我是Android编程的初学者。我想编写一个带有片段的程序,我阅读本教程(http://www.mysamplecode.com/2012/08/android-fragment-example.html)并编写该代码,但是当我运行该程序时,该程序出现编译器错误! 这些错误是关于add()和replace()函数的。我如何解决这个错误和转换类型?
我在下面写了AndroidFragmentActivity类,请阅读并帮助我。
AndoridFragmentActivity.java:
package com.appfragmentarray;
import android.app.Activity;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import com.appfragmentarray.ListFragment.OnURLSelectedListener;
public class AndroidFragmentActivity extends Activity implements OnURLSelectedListener{
boolean detailPage = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.v("AndroidFragmentActivity", "onCreate()");
Log.v("AndroidFragmentsavedInstanceState", savedInstanceState == null ? "true" : "false");
setContentView(R.layout.activity_main);
if(savedInstanceState == null) {
android.app.FragmentTransaction ft = getFragmentManager().beginTransaction();
ListFragment listFragment = new ListFragment();
ft.add(R.id.displayList, listFragment, "List_Fragment");
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
if(findViewById(R.id.displayDetail) != null){
detailPage = true;
getFragmentManager().popBackStack();
DetailFragment detailFragment = (DetailFragment) getFragmentManager().findFragmentById(R.id.displayDetail);
if(detailFragment == null){
android.app.FragmentTransaction ft = getFragmentManager().beginTransaction();
detailFragment = new DetailFragment();
ft.replace(R.id.displayDetail, detailFragment, "Detail_Fragment1");
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();
}
}
}
public void onURLSelected(String URL) {
Log.v("AndroidFragmentActivity",URL);
if(detailPage){
DetailFragment detailFragment = (DetailFragment)
getFragmentManager().findFragmentById(R.id.displayDetail);
detailFragment.updateURLContent(URL);
}
else{
DetailFragment detailFragment = new DetailFragment();
detailFragment.setURLContent(URL);
android.app.FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.displayList, detailFragment, "Detail_Fragment2");
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(null);
ft.commit();
}
}
}
的错误是:
不能从片段投射到DetailFragment
的方法Add(INT,片段,字符串)在类型FragmentTransaction 不适用于参数(int,ListFragment,String)
的方法代替(INT,片段,字符串)在 型FragmentTransaction不适用的参数(INT, DetailFragment,字符串)
我怎样才能解决这个问题呢?谢谢。
感谢快速回复。你的意思是,我应该导入support.v4.app或导入support.app supportFragmentManager()和添加()等不是都tehm?这是真的? –
@NiceNICE'supportFragmentManager()'和'add()'是您已经导入的'android.support.v4.app.FragmentTransaction' * class *的一部分*方法。只需确保您现在调用'getSupportFragmentManager()'而不是'getFragmentManager()'。 'add()'方法是相同的,如果你在Eclipse中按'ctrl + shift + O'来修复导入,请确保你扩展了'FragmentActivity'。 –
getSupportFragmentManger()适用于Android 3+。这是真的?如果我在manifest文件中声明minsdkVersion = 9,如果程序在android 2.3的设备上运行,会发生什么? (我导入android.support.v4.app不android.app)。 –