我试图通过使用savedInstance和Bundle来补偿屏幕方向发生变化时的列表项,但我不断收到多个java.lang.ClassNotFoundException错误。当我单步执行代码时,似乎将项目添加到捆绑包中,但是当我在调试模式下尝试查看该项目时,它将显示java.lang.ClassNotFoundException错误。我想指出的是,“ ts”的可序列化值显示相同的错误,但是当我旋转屏幕时,将保留原始时间。
我真的不确定发生了什么,任何帮助将不胜感激。
主要活动//
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_li_summary);
getWindow().setSoftInputMode(
WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
if (savedInstanceState != null)
{
if ((savedInstanceState != null) && (savedInstanceState.getSerializable("ts") != null))
{
startTime = (Calendar) savedInstanceState.getSerializable("starttime");
String samp = (String) savedInstanceState.getSerializable("ts");
refreshTS = (TextView) findViewById(R.id.timeStamp);
refreshTS.setText(samp);
String[] values = savedInstanceState.getStringArray("listItems");
if (values != null) {
for (int i = 0; i< values.length; i++) {
mMainListAdapter.add(values[i]);
}
}
}
}
}
savedInstance //
@Override
protected void onSaveInstanceState(Bundle state) {
super.onSaveInstanceState(state);
state.putSerializable("starttime", startTime);
state.putSerializable("ts",refreshTS.getText().toString());
ArrayList<String> values = new ArrayList<String>() ;
for (int i =0; i< mMainListAdapter.getCount(); i++)
{
String obj = mMainListAdapter.getItem(i);
values.add(obj);
}
state.putStringArrayList("listItems", values);
}
堆栈跟踪//
06-05 07:27:08.394 13901-13901/commyapp.myapp W/Bundle﹕ Attempt to cast generated internal exception:
java.lang.ClassCastException: java.util.ArrayList cannot be cast to java.lang.String[]
at android.os.Bundle.getStringArray(Bundle.java:1565)
at commyapp.myapp.Summary.onCreate(Summary.java:90)
at android.app.Activity.performCreate(Activity.java:5600)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2504)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2599)
at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4218)
at android.app.ActivityThread.access$1000(ActivityThread.java:174)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1327)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5748)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
at dalvik.system.NativeStart.main(Native Method)
最佳答案
在onSaveInstanceState
上,为ArrayList<String>
存储listItems
,但是在检索listItems
时,使用getStringArray("listItems")
返回String[]
。
要检索listItems
,应使用以下命令:
ArrayList<String> values = savedInstanceState.getStringArrayList("listItems");