Question

在此处输入代码我在清单中有android:configChanges="orientation"但由于某种原因在旋转视图后转到下一个活动并NullPointerException

12-03 17:28:42.673: ERROR/AndroidRuntime(10537): FATAL EXCEPTION: main
        java.lang.RuntimeException: Unable to start activity ComponentInfo{com.is.mbank/com.is.mbank.ui.mobileBanking.TransactionConfirmation}: java.lang.NullPointerException
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
        at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3740)
        at android.app.ActivityThread.access$700(ActivityThread.java:141)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:5103)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:525)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
        at dalvik.system.NativeStart.main(Native Method)
        Caused by: java.lang.NullPointerException
        at com.is.mbank.ui.mobileBanking.TransactionConfirmation.onCreate(TransactionConfirmation.java:45)
        at android.app.Activity.performCreate(Activity.java:5133)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
        ... 12 more

HERE是TransactionConfirmation的代码

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.transaction_confirmation);

        paymentUtil = new PaymentUtil(this);

        textViewFrom = (TextView) findViewById(R.id.from);
        textViewTo = (TextView) findViewById(R.id.to);
        textViewAmount = (TextView) findViewById(R.id.amount);
        textViewCurrency = (TextView) findViewById(R.id.currency);

        from = paymentUtil.paymentData.get(Constants.ACCOUNT_NUMBER_FROM).toString();

它在最后一行产生空指针异常

Answer 1

当您旋转屏幕时，活动会被销毁并重新生成，因此您应该检查活动是否查找某些参数（可能使用意图等传递），再次生成时它们不存在。

Answer 2

在清单文件中根据以下内容进行更改

android:configChanges="keyboardHidden|orientation|screenSize|screenLayout"

希望这可能有用。

Answer 3

问题解决了，问题是我在onCreate（）中为我的意图设置了类，现在我从那里删除了它的工作正常。

感谢您的关注。

的问候，

屏幕上的空指针异常旋转android

3 个答案: