首选项片段中的运行时异常
Runtime Exception in Preference Fragment
我有一个包含以下文件的偏好片段
preference.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference
android:defaultValue="0000"
android:key="@string/pin"
android:summary="Set Pin for Notes"
android:title="Password" />
</PreferenceScreen>
偏好Activity
public class PreferenceActivity extends AppCompatActivity {
@BindView(R.id.toolbar_settings)
Toolbar toolbarSettings;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
ButterKnife.bind(this);
setSupportActionBar(toolbarSettings);
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
}
最后
偏好片段
public class PreferenceFragment extends PreferenceFragmentCompat {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(R.xml.preference);
}
}
但是在这里调用 addPreferencesFromResources 时，我遇到了运行时异常。
这是日志堆栈
异常
02-21 22:23:36.574 8813-8813/in.snotes.snotes E/AndroidRuntime: FATAL EXCEPTION: main
Process: in.snotes.snotes, PID: 8813
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.snotes.snotes/in.snotes.snotes.settings.PreferenceActivity}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class fragment
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:225)
at android.support.v7.preference.Preference.getPersistedString(Preference.java:1601)
at android.support.v7.preference.EditTextPreference.onSetInitialValue(EditTextPreference.java:92)
at android.support.v7.preference.Preference.dispatchSetInitialValue(Preference.java:1517)
at android.support.v7.preference.Preference.onAttachedToHierarchy(Preference.java:1245)
at android.support.v7.preference.Preference.onAttachedToHierarchy(Preference.java:1257)
at android.support.v7.preference.PreferenceGroup.addPreference(PreferenceGroup.java:194)
at android.support.v7.preference.PreferenceGroup.addItemFromInflater(PreferenceGroup.java:126)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:355)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:162)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:112)
at android.support.v7.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:138)
at android.support.v7.preference.PreferenceFragmentCompat.addPreferencesFromResource(PreferenceFragmentCompat.java:432)
at in.snotes.snotes.settings.PreferenceFragment.onCreatePreferences(PreferenceFragment.java:12)
at android.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:224)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2246)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1377)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1650)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1906)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3698)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:350)
at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:67)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:777)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
02-21 22:23:36.575 8813-8813/in.snotes.snotes E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at in.snotes.snotes.settings.PreferenceActivity.onCreate(PreferenceActivity.java:21)
at android.app.Activity.performCreate(Activity.java:6672)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
我在编辑文本首选项之前有一个切换首选项并且效果很好。一旦我用编辑文本首选项替换了开关首选项，就会抛出此错误。
我该如何解决这个问题？
你能试试下面的代码吗？
strings.xml
<string name="pin_default_value">0000</string>
preference.xml
<EditTextPreference
android:defaultValue="@string/pin_default_value"
android:key="@string/pin"
android:summary="Set Pin for Notes"
android:title="Password" />
Android 正在尝试设置默认值，但它正在读取 0000 作为 Integer 而不是 String 主要原因是 android:defaultValue不直接处理为String。这样，为了避免这种 int 到 String 的转换错误，您必须显式使用 String 值（通过使用 strings.xml.
中的一些字符串
备注
您可能需要清除您的应用数据，因为错误的默认值可能已经存储在缓存文件中。
我有一个包含以下文件的偏好片段
preference.xml
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
<EditTextPreference
android:defaultValue="0000"
android:key="@string/pin"
android:summary="Set Pin for Notes"
android:title="Password" />
</PreferenceScreen>
偏好Activity
public class PreferenceActivity extends AppCompatActivity {
@BindView(R.id.toolbar_settings)
Toolbar toolbarSettings;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
ButterKnife.bind(this);
setSupportActionBar(toolbarSettings);
ActionBar actionBar = getSupportActionBar();
if (actionBar != null) {
actionBar.setDisplayHomeAsUpEnabled(true);
}
}
}
最后
偏好片段
public class PreferenceFragment extends PreferenceFragmentCompat {
@Override
public void onCreatePreferences(Bundle savedInstanceState, String rootKey) {
addPreferencesFromResource(R.xml.preference);
}
}
但是在这里调用 addPreferencesFromResources 时，我遇到了运行时异常。
这是日志堆栈
异常
02-21 22:23:36.574 8813-8813/in.snotes.snotes E/AndroidRuntime: FATAL EXCEPTION: main
Process: in.snotes.snotes, PID: 8813
java.lang.RuntimeException: Unable to start activity ComponentInfo{in.snotes.snotes/in.snotes.snotes.settings.PreferenceActivity}: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2659)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
Caused by: android.view.InflateException: Binary XML file line #0: Binary XML file line #0: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #0: Error inflating class fragment
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.String
at android.app.SharedPreferencesImpl.getString(SharedPreferencesImpl.java:225)
at android.support.v7.preference.Preference.getPersistedString(Preference.java:1601)
at android.support.v7.preference.EditTextPreference.onSetInitialValue(EditTextPreference.java:92)
at android.support.v7.preference.Preference.dispatchSetInitialValue(Preference.java:1517)
at android.support.v7.preference.Preference.onAttachedToHierarchy(Preference.java:1245)
at android.support.v7.preference.Preference.onAttachedToHierarchy(Preference.java:1257)
at android.support.v7.preference.PreferenceGroup.addPreference(PreferenceGroup.java:194)
at android.support.v7.preference.PreferenceGroup.addItemFromInflater(PreferenceGroup.java:126)
at android.support.v7.preference.PreferenceInflater.rInflate(PreferenceInflater.java:355)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:162)
at android.support.v7.preference.PreferenceInflater.inflate(PreferenceInflater.java:112)
at android.support.v7.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:138)
at android.support.v7.preference.PreferenceFragmentCompat.addPreferencesFromResource(PreferenceFragmentCompat.java:432)
at in.snotes.snotes.settings.PreferenceFragment.onCreatePreferences(PreferenceFragment.java:12)
at android.support.v7.preference.PreferenceFragmentCompat.onCreate(PreferenceFragmentCompat.java:224)
at android.support.v4.app.Fragment.performCreate(Fragment.java:2246)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1377)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1650)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1906)
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3698)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:350)
at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:67)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:777)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:858)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:821)
at android.view.LayoutInflater.inflate(LayoutInflater.java:518)
at android.view.LayoutInflater.inflate(LayoutInflater.java:426)
at android.view.LayoutInflater.inflate(LayoutInflater.java:377)
02-21 22:23:36.575 8813-8813/in.snotes.snotes E/AndroidRuntime: at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
at in.snotes.snotes.settings.PreferenceActivity.onCreate(PreferenceActivity.java:21)
at android.app.Activity.performCreate(Activity.java:6672)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1140)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2612)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2724)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1473)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6123)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:757)
我在编辑文本首选项之前有一个切换首选项并且效果很好。一旦我用编辑文本首选项替换了开关首选项，就会抛出此错误。
我该如何解决这个问题？
你能试试下面的代码吗？
strings.xml
<string name="pin_default_value">0000</string>
preference.xml
<EditTextPreference
android:defaultValue="@string/pin_default_value"
android:key="@string/pin"
android:summary="Set Pin for Notes"
android:title="Password" />
Android 正在尝试设置默认值，但它正在读取 0000 作为 Integer 而不是 String 主要原因是 android:defaultValue不直接处理为String。这样，为了避免这种 int 到 String 的转换错误，您必须显式使用 String 值（通过使用 strings.xml.
备注
您可能需要清除您的应用数据，因为错误的默认值可能已经存储在缓存文件中。