指导Android 空指针异常的问题

代码如下:

 private OnPreferenceClickListener mPrefClickListener = new OnPreferenceClickListener() {
    @Override
    public boolean onPreferenceClick(Preference preference) {
        Intent intent = preference.getIntent();
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException e) {
            Toast.makeText(getActivity(), R.string.plugin_app_unavailable, Toast.LENGTH_LONG).show();
            Log.w(TAG, preference.getKey() + " not available", e);
        }

        return true;
    }
};

log 如下：

    01-19 06:34:24.911  6327  6327 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.content.Intent.migrateExtraStreamToClipData()' on a null object reference


01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.Instrumentation.execStartActivity(Instrumentation.java:1622)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.Activity.startActivityFromFragment(Activity.java:4548)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.Activity.startActivityFromFragment(Activity.java:4510)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.Fragment.startActivity(Fragment.java:1086)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.Fragment.startActivity(Fragment.java:1065)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at com.lenovo.settings.CharSettings$2.onPreferenceClick(CharSettings.java:114)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.preference.Preference.performClick(Preference.java:1015)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.preference.PreferenceScreen.onItemClick(PreferenceScreen.java:214)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.widget.AdapterView.performItemClick(AdapterView.java:310)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.widget.AbsListView.performItemClick(AbsListView.java:1188)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.widget.AbsListView$PerformClick.run(AbsListView.java:3231)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.widget.AbsListView$3.run(AbsListView.java:4165)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.os.Handler.handleCallback(Handler.java:815)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.os.Handler.dispatchMessage(Handler.java:104)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.os.Looper.loop(Looper.java:194)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:5731)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at java.lang.reflect.Method.invoke(Native Method)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at java.lang.reflect.Method.invoke(Method.java:372)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959)
 01-19 06:34:24.911 6327 6327 E AndroidRuntime: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754)