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所以我试图在我的主要活动中用一个来填充fragment另一个。主要活动是两者的父母。布局看起来像这样fragmentbuttonfragments

fragMoney包含TextViews需要设置的

fragCalculate包含EditText我从中获取输入以设置 fragMoney 的字段TextViews以及button计算总数的字段。

MainActivity，父母，是我试图做这项工作的地方。

我收到一条很长的错误消息，null pointer exception但我似乎无法弄清楚我哪里出错了。我冒昧地猜测这是因为我没有在某段代码之前声明某些内容。无论如何，这里是代码和 logcat。

主要活动按钮

public void calculateHandler(View view) {
    Log.v("*** DEBUG ***", "calc button");
    dailyView.setText("" + getDaily());
    Log.v("*** DEBUG ***", "getting daily");
    monthlyView.setText("" + getMonthly());
    Log.v("*** DEBUG ***", "getting month");
    annualView.setText("" + getAnnually());
    Log.v("*** DEBUG ***", "getting year");
    totalView.setText("" + getTotal());     
    Log.v("*** DEBUG ***", "getting total");
}

主要活动方式

public double getDaily() {

    double price = Double.parseDouble(packPrice.getText().toString());      
    double packs = Double.parseDouble(numPacks.getText().toString());

    daily = price * packs;

    return daily;
}

public double getMonthly() {
    double price = Double.parseDouble(packPrice.getText().toString());      
    double packs = Double.parseDouble(numPacks.getText().toString());

    monthly = price * packs * 30.41;

    return monthly;
}

public double getAnnually() {
    double price = Double.parseDouble(packPrice.getText().toString());      
    double packs = Double.parseDouble(numPacks.getText().toString());   

    annually = (price * packs) * 365;

    return annually;
}

public double getTotal () {
    double price = Double.parseDouble(packPrice.getText().toString());      
    double packs = Double.parseDouble(numPacks.getText().toString());
    double years = Double.parseDouble(numYears.getText().toString());

    total = (price * packs) * 365 * years;      

    return total;
}

日志猫

03-30 16:27:43.443: E/AndroidRuntime(815): FATAL EXCEPTION: main
03-30 16:27:43.443: E/AndroidRuntime(815): java.lang.IllegalStateException: Could not execute method of the activity
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.view.View$1.onClick(View.java:3591)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.view.View.performClick(View.java:4084)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.view.View$PerformClick.run(View.java:16966)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.os.Handler.handleCallback(Handler.java:615)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.os.Handler.dispatchMessage(Handler.java:92)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.os.Looper.loop(Looper.java:137)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.app.ActivityThread.main(ActivityThread.java:4745)
03-30 16:27:43.443: E/AndroidRuntime(815):  at java.lang.reflect.Method.invokeNative(Native Method)
03-30 16:27:43.443: E/AndroidRuntime(815):  at java.lang.reflect.Method.invoke(Method.java:511)
03-30 16:27:43.443: E/AndroidRuntime(815):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
03-30 16:27:43.443: E/AndroidRuntime(815):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
03-30 16:27:43.443: E/AndroidRuntime(815):  at dalvik.system.NativeStart.main(Native Method)
03-30 16:27:43.443: E/AndroidRuntime(815): Caused by: java.lang.reflect.InvocationTargetException
03-30 16:27:43.443: E/AndroidRuntime(815):  at java.lang.reflect.Method.invokeNative(Native Method)
03-30 16:27:43.443: E/AndroidRuntime(815):  at java.lang.reflect.Method.invoke(Method.java:511)
03-30 16:27:43.443: E/AndroidRuntime(815):  at android.view.View$1.onClick(View.java:3586)
03-30 16:27:43.443: E/AndroidRuntime(815):  ... 11 more
03-30 16:27:43.443: E/AndroidRuntime(815): Caused by: java.lang.NullPointerException
03-30 16:27:43.443: E/AndroidRuntime(815):  at com.example.smokin4tomsullivan.MainActivity.getDaily(MainActivity.java:162)
03-30 16:27:43.443: E/AndroidRuntime(815):  at com.example.smokin4tomsullivan.MainActivity.calculateHandler(MainActivity.java:199)
03-30 16:27:43.443: E/AndroidRuntime(815):  ... 14 more

As always thank you everyone for any help given

Update Note

ok so after debugging it appears this line of code:

double price = Double.parseDouble(packPrice.getText().toString()); is giving me the trouble. It's an EditText field in the CalcFrag set to take the type numDecimals, to which at this run i entered 8.7 Any ideas?

2nd Update This is the code that initialized packPrice, its in onCreate

EditText packPrice = (EditText) findViewById(R.id.per_pack_Id);

3rd Update this is the code I am running with log.v also see above for modified calcButton

public double getDaily() {
    Log.v("*** DEBUG ***", "running getDaily");
    EditText packPrice = (EditText) findViewById(R.id.per_pack_Id);
    Log.v("*** DEBUG ***", "initialized packPrice");
    double price = Double.parseDouble(packPrice.getText().toString());
    Log.v("*** DEBUG ***", packPrice.getText().toString());
    String test = ("" + price);
    Log.v("*** DEBUG ***", test);
    double packs = Double.parseDouble(numPacks.getText().toString());
    String test1 = ("" + packs);
    Log.v("*** DEBUG ***", test1);

    daily = price * packs;

    return daily;
}

When I run it before it crashes log.v spits out this

03-30 17:34:15.883: V/*** DEBUG ***(1166): calc button
03-30 17:34:15.883: V/*** DEBUG ***(1166): running getDaily
03-30 17:34:15.893: V/*** DEBUG ***(1166): initialized packPrice
03-30 17:34:15.893: V/*** DEBUG ***(1166): 9.9 <-- the values I entered
03-30 17:34:15.893: V/*** DEBUG ***(1166): 9.9 <-- the values I entered
4

1 回答 1

2

The exception seems pretty clear to me, either packPrice or numPacks are null or the return from getText is null within your getDaily method.

You need to figure out which portion of the call is in fact null and work backwards from that.

于 2013-03-30T20:46:53.310 回答