Question

我正在尝试成功存储和检索URI的arraylist。我不完全确定在哪里放置＆＃39;存储＆＃39;部分，但将它放入onPause是有意义的。当我尝试离开活动时，我的应用程序崩溃了。当我试图将它放入onStop时，我遇到了类似的错误。请帮忙知道我在这里做错了什么。

FATAL EXCEPTION: main


Process: my.package.myapplication, PID: 9357
    java.lang.RuntimeException: Unable to pause activity {my.package.myapplication/my.package.myapplication.Person1Screen}: java.lang.RuntimeException: writeValueXml: unable to write value content://com.android.providers.media.documents/document/image%3A49684
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3395)
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3354)
        at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3329)
        at android.app.ActivityThread.access$1100(ActivityThread.java:157)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1362)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:148)
        at android.app.ActivityThread.main(ActivityThread.java:5477)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
     Caused by: java.lang.RuntimeException: writeValueXml: unable to write value content://com.android.providers.media.documents/document/image%3A49684
        at com.android.internal.util.XmlUtils.writeValueXml(XmlUtils.java:710)
        at com.android.internal.util.XmlUtils.writeValueXml(XmlUtils.java:620)
        at com.android.internal.util.XmlUtils.writeSetXml(XmlUtils.java:356)
        at com.android.internal.util.XmlUtils.writeValueXml(XmlUtils.java:693)
        at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:300)
        at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:269)
        at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:235)
        at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:192)
        at android.app.SharedPreferencesImpl.writeToFile(SharedPreferencesImpl.java:600)
        at android.app.SharedPreferencesImpl.access$800(SharedPreferencesImpl.java:52)
        at android.app.SharedPreferencesImpl$2.run(SharedPreferencesImpl.java:515)
        at android.app.SharedPreferencesImpl.enqueueDiskWrite(SharedPreferencesImpl.java:536)
        at android.app.SharedPreferencesImpl.access$100(SharedPreferencesImpl.java:52)
        at android.app.SharedPreferencesImpl$EditorImpl.commit(SharedPreferencesImpl.java:458)
        at my.package.myapplication.Person1Screen.onPause(Person1Screen.java:257)
        at android.app.Activity.performPause(Activity.java:6557)
        at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1312)
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3381)
        at android.app.ActivityThread.performPauseActivity(ActivityThread.java:3354) 
        at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:3329) 
        at android.app.ActivityThread.access$1100(ActivityThread.java:157) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1362) 
        at android.os.Handler.dispatchMessage(Handler.java:102) 
        at android.os.Looper.loop(Looper.java:148) 
        at android.app.ActivityThread.main(ActivityThread.java:5477) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我的onPause方法如下。 Person1Screen.java:257是最后的editor.commit行。

@Override
protected void onPause(){
    super.onPause();
    // We need an Editor object to make preference changes.
    // All objects are from android.context.Context
    SharedPreferences settings = getSharedPreferences(PREF_FILE, 0);
    SharedPreferences.Editor editor = settings.edit();
    Set<String> tempSet = new HashSet(happyList);
    editor.putStringSet(HAPPY_LIST, tempSet);
    editor.commit();
}

我在onCreate中的检索（如果它有帮助）：

// Restore preferences
    SharedPreferences settings = getSharedPreferences(PREF_FILE, Context.MODE_PRIVATE);
    Set<String> tempSet = settings.getStringSet(HAPPY_LIST, null);
    if(tempSet != null)
        for (String str : tempSet)
            happyList.add(Uri.parse(str));

＆＃34; happyList＆＃34;属于ArrayList<Uri>类型。

Answer 1

您似乎正在执行从HashSet到Set<String>的未经检查的通用分配，其中该集实际上包含Uri个对象。当您尝试将此集写入首选项时，代码会尝试读取String但实际上会获取Uri对象，从而导致崩溃。要解决此问题，您应该将Uri个对象转换回String s。

所以替换这一行：

Set<String> tempSet = new HashSet(happyList);

使用：

Set<String> tempSet = new HashSet<String>();
for (Uri uri : happyList) {
    tempSet.add(uri.toString());
}

java.lang.RuntimeException：writeValueXml：无法写入值

1 个答案: