所以我试图在我的 android 应用程序中向 SharedPreferences 写入一些字符串。我首先在我的 Application 子类中声明 SharedPreferences 及其原始属性。我希望能够在应用程序的其他 Activity 中更改我的数据值，但出现以下错误。我应该如何解决这个问题？其他人发布了同样的问题，但没有人真正回答他，所以这就是我再次提问的原因。任何帮助表示赞赏!谢谢
SharedPreferencesImpl﹕ writeToFile: Got exception:
java.io.IOException: java.nio.charset.CoderResult[Malformed-input error with erroneous input length 1]
at com.android.internal.util.FastXmlSerializer.flush(FastXmlSerializer.java:225)
at com.android.internal.util.FastXmlSerializer.append(FastXmlSerializer.java:86)
at com.android.internal.util.FastXmlSerializer.escapeAndAppendString(FastXmlSerializer.java:127)
at com.android.internal.util.FastXmlSerializer.text(FastXmlSerializer.java:361)
at com.android.internal.util.XmlUtils.writeValueXml(XmlUtils.java:425)
at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:245)
at com.android.internal.util.XmlUtils.writeMapXml(XmlUtils.java:185)
at android.app.SharedPreferencesImpl.writeToFile(SharedPreferencesImpl.java:596)
at android.app.SharedPreferencesImpl.access$800(SharedPreferencesImpl.java:52)
at android.app.SharedPreferencesImpl$2.run(SharedPreferencesImpl.java:511)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:856)
一些示例代码:
这是在我的 Application 类中声明的:
editor.putString("firstRun", "true");
editor.apply();
这是在我的外部 Activity 中声明的:
editor.putString("firstRun", "false");
editor.apply();
这就是我的共享首选项的声明方式(在我的 Application 子类中):
SharedPreferences prefs = getApplicationContext().getSharedPreferences("My App", 0);
编辑: 这是更多代码: 应用类
public class MainApplication extends Application {
public static SharedPreferences prefs;
public SharedPreferences.Editor editor;
public void onCreate() {
super.onCreate();
// Data Configurations etc
prefs = getSharedPreferences("My App", Context.MODE_PRIVATE);
editor = prefs.edit();
Map<String, ?> keys = prefs.getAll();
if (keys.size() == 0) {
editor.putString("firstRun", "true");
editor.apply();
}
// Block of Code saving more strings to shared preferences
}
}
正在更改首选项的 Activity:
public class MainActivity extends Activity {
public void onCreate() {
super.onCreate();
SharedPreferences.Editor editor = MainApplication.prefs.edit();
if (MainApplication.prefs.getString("firstRun", "false").equals("true")) {
// Set data correctly
editor.remove("firstRun");
editor.putString("firstRun", "false");
editor.apply();
// yadda yadda yadda more code doing other things not related to shared preferences
}
}
}
}
应该提到这一点，我还将 json 内容保存到共享首选项中。
SharedPreferences 的一些日志:
Tutorial, true
Notification0, {"alert":"Test Alert","category":"news","date":"Aug 7, 2015","name":"Alert01"}
VersionNum, 1.0
firstRun, false
New0, {"alert":"Test Alert","category":"news","fileData":"<!doctype html><html itemscope=\"\" itemtype=\"http://schema.org/WebPage\" lang=\"en\"><head><meta content=\"Search the world's information, including webpages, images, videos and more. Google has many special features to help you find exactly what you're looking for.\" name=\"description\"><meta content=\"noodp\" name=\"robots\"><meta content=\"/images/google_favicon_128.png\" itemprop=\"image\"><meta content=\"origin\" id=\"mref\" name=\"referrer\"><title>Google</title> <script>(function(){window.google={kEI:'29q4Va--H4W0eI2jsMgP',kEXPI:'3700337,3700372,4028875,4029815,4031109,4032235,4032500,4032678,4033307,4033344,4034882,4035869,4036527,4036848,4037333,4037457,4037569,4038012,4038399,4038464,4038821,4039386,4039462,4039879,4039886,4039895,4039937,4040028,4040061,4040112,4040136,4040412,4040513,4040678,4040849,4040865,4040976,4040982,4041079,4041304,4041323,4041440,4042052,4042103,4042125,8300095,8300200,8300203,8500394,8501295,8501407,8501489,8501584,8501767,10200083,10200095,10201249,10201251,16200005,16200009,16200011',authuser:0,j:{en:1,bv:21,pm:'p',u:'c9c918f0',qbp:0,rre:false},kscs:'c9c918f0_21'};google.kHL='en';})();(function(){google.lc=[];google.li=0;google.getEI=function(a){for(var b;a&&(!a.getAttribute||!(b=a.getAttribute(\"eid\")));)a=a.parentNode;return b||google.kEI};google.getLEI=function(a){for(var b=null;a&&(!a.getAttribute||!(b=a.getAttribute(\"leid\")));)a=a.parentNode;return b};google.https=function(){return\"https:\"==window.location.protocol};google.ml=function(){return null};google.time=function(){return(new Date).getTime()};google.log=function(a,b,d,e,g){a=google.logUrl(a,b,d,e,g);if(\"\"!=a){b=new Image;var c=google.lc,f=google.li;c[f]=b;b.onerror=b.onload=b.onabort=function(){delete c[f]};window.google&&window.google.vel&&window.google.vel.lu&&window.google.vel.lu(a);b.src=a;google.li=f+1}};google.logUrl=function(a,b,d,e,g){var c=\"\",f=google.ls||\"\";if(!d&&-1==b.search(\"&ei=\")){var h=google.getEI(e),c=\"&ei=\"+h;-1==b.search(\"&lei=\")&&((e=google.getLEI(e))?c+=\"&lei=\"+e:h!=google.kEI&&(c+=\"&lei=\"+google.kEI))}a=d||\"/\"+(g||\"gen_204\")+\"?atyp=i&ct=\"+a+\"&cad=\"+b+c+f+\"&zx=\"+google.time();/^http:/i.test(a)&&google.https()&&(google.ml(Error(\"a\"),!1,{src:a,glmm:1}),a=\"\");return a};google.y={};google.x=function(a,b){google.y[a.id]=[a,b];return!1};google.load=function(a,b,d){google.x({id:a+k++},function(){google.load(a,b,d)})};var k=0;})();google.kCSI={};\ngoogle.j.b=(!!location.hash&&!!location.hash.match('[#&]((q|fp)=|tbs=rimg|tbs=simg|tbs=sbi)'))\n||(google.j.qbp==1);(function(){window.google.sn='webhp';google.timers={};google.startTick=function(a,b){google.timers[a]={t:{start:google.time()},it:{},bfr:!!b,b:{},olh:null};window.performance&&window.performance.now&&(google.timers[a].wsrt=Math.floor(window.performance.now()))};google.tick=function(a,b,d){google.timers[a]||google.startTick(a);google.timers[a].t[b]=d||google.time()};google.bit=function(a,b,d){google.timers[a]||google.startTick(a);var c=google.timers[a].it[b];c||(c=google.timers[a].it[b]=[]);var e=c.push({s:d||google.time()})-1;return function(){c[e]&&(c[e].e=d||google.time())}};google.blockCSI=function(a,b){google.timers[a].b[b]=!0};google.unblockCSI=function(a,b,d){if(a=google.timers[a]){a=a.b;a[b]=!1;for(var c in a)if(a.hasOwnProperty(c)&&a[c])return;google.csiReport&&google.csiReport(void 0,void 0,d)}};google.rolh=function(a){google.uolh();google.timers.load&&(google.timers.load.olh=a,window.addEventListener?window.addEventListener(\"load\",a,!1):window.attachEvent&&window.attachEvent(\"onload\",a))};google.uolh=function(){if(google.timers.load){var a=google.timers.load;a.olh&&(window.addEventListener?window.removeEventListener(\"load\",a.olh,void 0):window.attachEvent&&window.detachEvent(\"onload\",a.olh),a.olh=null)}};google.startTick(\"load\",!0);google.blockCSI(\"load\",\"ol\");google.blockCSI(\"load\",\"xjs\");google.iml=function(a,b){google.tick(\"iml\",a.id||a.src||a.name,b)};})();google.afte=!0;google.aft=functio
奇怪的是，当我稍后在我的应用程序中将 Tutorial 设置为 false 时，它确实将其设置为 false。但是当我重新运行程序时，Tutorial 被设置回 true。但是，我不会在任何地方的代码中重置它。有时 firstRun 也会发生这种情况，但有时它会被设置为 false ...有什么想法吗？我会仔细检查。
最佳答案
我不知道您遇到问题的确切原因，但是 SharedPreferences 对象无论如何都旨在存储少量数据。如果您需要存储更多数据，我建议您改为将其保存到内部存储器。
我在内部存储中存储和检索数据从来没有遇到过任何问题，而我遇到了错误和 SharedPreferences 的恼人限制(例如没有 putStringList)。除了最简单的数据，我会避免使用 SharedPreferences。
关于Android SharedPreferences IOException 错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32530733/