Android片段向後兼容

我想要做一個android應用程序，我們需要使用片段。我遵循規則，而我正在向後兼容。即擴展FragmentActivity而不是Activity，我也使用getSupportFragmentManager（）。相同的代碼與4.1一起工作，但不適用於2.2。Android片段向後兼容

我使用

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 

String newTime = String.valueOf(System.currentTimeMillis()); 
DetailFragment fragment = (DetailFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.detailFragment); 
if (fragment != null && fragment.isInLayout()) { 
     fragment.setText(newTime); 
    } else { 
     Intent intent = new Intent(getActivity().getApplicationContext(),  DetailActivity.class); 
     intent.putExtra("value", newTime); 
     startActivity(intent);

能

任何一項幫助嗎？我正在接近部隊。無法啓動活動組件信息。它在setContentView（）主要活動中顯示錯誤，其中包含分欄。

<?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" 
     android:layout_marginTop="?android:attr/actionBarSize" 
     class="com.example.fragmentsample.MyListFragment" ></fragment> 

    <fragment 
     android:id="@+id/detailFragment" 
     android:layout_width="0dp" 
     android:layout_weight="2" 
     android:layout_height="match_parent" 
     class="com.example.fragmentsample.DetailFragment" > 
     <!-- Preview: [email protected]/details --> 
    </fragment> 

</LinearLayout>

的logcat：

10-03 16:03:54.586: E/AndroidRuntime(649): FATAL EXCEPTION: main 
10-03 16:03:54.586: E/AndroidRuntime(649): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.fragmentsample/com.example.fragmentsample.RssfeedActivity}: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x2 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.os.Handler.dispatchMessage(Handler.java:99) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.os.Looper.loop(Looper.java:123) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread.main(ActivityThread.java:3683) 
10-03 16:03:54.586: E/AndroidRuntime(649): at java.lang.reflect.Method.invokeNative(Native Method) 
10-03 16:03:54.586: E/AndroidRuntime(649): at java.lang.reflect.Method.invoke(Method.java:507) 
10-03 16:03:54.586: E/AndroidRuntime(649): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
10-03 16:03:54.586: E/AndroidRuntime(649): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
10-03 16:03:54.586: E/AndroidRuntime(649): at dalvik.system.NativeStart.main(Native Method) 
10-03 16:03:54.586: E/AndroidRuntime(649): Caused by: java.lang.UnsupportedOperationException: Can't convert to dimension: type=0x2 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.content.res.TypedArray.getDimensionPixelSize(TypedArray.java:463) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.view.ViewGroup$MarginLayoutParams.<init>(ViewGroup.java:3692) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.widget.LinearLayout$LayoutParams.<init>(LinearLayout.java:1400) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:1326) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.widget.LinearLayout.generateLayoutParams(LinearLayout.java:47) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.view.LayoutInflater.rInflate(LayoutInflater.java:625) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.view.LayoutInflater.inflate(LayoutInflater.java:408) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.view.LayoutInflater.inflate(LayoutInflater.java:320) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.view.LayoutInflater.inflate(LayoutInflater.java:276) 
10-03 16:03:54.586: E/AndroidRuntime(649): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.Activity.setContentView(Activity.java:1657) 
10-03 16:03:54.586: E/AndroidRuntime(649): at com.example.fragmentsample.RssfeedActivity.onCreate(RssfeedActivity.java:10) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
10-03 16:03:54.586: E/AndroidRuntime(649): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
10-03 16:03:54.586: E/AndroidRuntime(649): ... 11 more

來源

2012-10-03 Ryada

安置自己的logcat錯誤日誌，請 –

在XML文件中需要提供的完整路徑片段：

<android.support.v4.app.Fragment 
android:id="@+id/detailFragment" 
     android:layout_width="0dp" 
     android:layout_weight="2" 
     android:layout_height="match_parent" 
     class="com.example.fragmentsample.DetailFragment" > 
     <!-- Preview: [email protected]/details --> 
    </android.support.v4.app.Fragment>

來源

2012-10-03 10:28:33 Givi

耶我DetailFragment的多數民衆贊成完整路徑片段類。它使用的是android 4.0。不適用於較低版本。 – Ryada

嘿傢伙對不起..現在它工作正常。其實問題是我用4.1版本創建了應用程序。但是當你創建應用程序時，它會創建默認的操作欄。 – Ryada

Android片段向後兼容

回答

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