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全部——我的项目（计算技巧）运行良好，直到我添加了一些 BigDecimal 变量来帮助舍入。现在，当我点击“计算”时，应用程序强制关闭，logcat 显示：

 06-01 14:24:21.246: W/dalvikvm(15364): threadid=1: thread exiting with uncaught exception (group=0x40a4a1f8)
06-01 14:24:21.256: E/AndroidRuntime(15364): FATAL EXCEPTION: main
06-01 14:24:21.256: E/AndroidRuntime(15364): java.lang.IllegalStateException: Could not execute method of the activity
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.View$1.onClick(View.java:3044)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.View.performClick(View.java:3511)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.View.onKeyUp(View.java:6078)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.widget.TextView.onKeyUp(TextView.java:5636)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.KeyEvent.dispatch(KeyEvent.java:2623)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.View.dispatchKeyEvent(View.java:5500)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1246)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1879)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1361)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.app.Activity.dispatchKeyEvent(Activity.java:2324)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1806)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3327)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewRootImpl.handleFinishedEvent(ViewRootImpl.java:3300)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2460)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.os.Handler.dispatchMessage(Handler.java:99)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.os.Looper.loop(Looper.java:137)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.app.ActivityThread.main(ActivityThread.java:4424)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.reflect.Method.invokeNative(Native Method)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.reflect.Method.invoke(Method.java:511)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at dalvik.system.NativeStart.main(Native Method)
06-01 14:24:21.256: E/AndroidRuntime(15364): Caused by: java.lang.reflect.InvocationTargetException
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.reflect.Method.invokeNative(Native Method)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.reflect.Method.invoke(Method.java:511)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at android.view.View$1.onClick(View.java:3039)
06-01 14:24:21.256: E/AndroidRuntime(15364):    ... 24 more
06-01 14:24:21.256: E/AndroidRuntime(15364): Caused by: java.lang.NumberFormatException: Invalid float: ""
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.StringToReal.invalidReal(StringToReal.java:63)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.StringToReal.parseFloat(StringToReal.java:289)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at java.lang.Float.parseFloat(Float.java:300)
06-01 14:24:21.256: E/AndroidRuntime(15364):    at com.tip.ping.TippingActivity.calculateNumbers(TippingActivity.java:47)
06-01 14:24:21.256: E/AndroidRuntime(15364):    ... 27 more

我的代码是：

 public class TippingActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    public void calculateNumbers(View view) {
        EditText text = (EditText)findViewById(R.id.edit_bill);             
        String value;
        value = text.getText().toString();      
        float bill = Float.parseFloat(value);
        BigDecimal billbd;
        billbd = new BigDecimal(bill);


        EditText text2 = (EditText)findViewById(R.id.edit_tip);
        String value2;
        value2 = text2.getText().toString();    
        if(!value2.contains("."))
            value2 = "."+value2;
        float tip = Float.parseFloat(value2);
        BigDecimal tipbd;
        tipbd = new BigDecimal(tip);


        EditText text3 = (EditText)findViewById(R.id.edit_people);
        String value3;
        value3 = text3.getText().toString();

        TextView answer = (TextView) findViewById(R.id.answer);
        String answers;
        answers = answer.getText().toString();
        float answerf = Float.parseFloat(answers);
        BigDecimal answerbd;
        answerbd = new BigDecimal(answerf);
        answerbd.setScale(2);   
        TextView quick_answer = (TextView) findViewById(R.id.quick_answer);
        String qanswers;
        qanswers = quick_answer.getText().toString();
        float qanswerf = Float.parseFloat(qanswers);
        BigDecimal qanswerbd;
        qanswerbd = new BigDecimal(qanswerf);       

        float l3 = Float.parseFloat(value3);
        BigDecimal l3bd;
        l3bd = new BigDecimal(l3);

        qanswerbd = billbd.multiply(tipbd).add(billbd);
        qanswerbd.setScale(2, RoundingMode.HALF_UP);
        String resultbd;
        resultbd = qanswerbd.toString();   

        quick_answer.setText(resultbd);     
    }
}

提前致谢！

4

3 回答 3

2

看起来像一个空的浮点值，但如果没有行号就很难说（第 47 行是...？）

引起：java.lang.NumberFormatException：无效浮点数：“”

EditText text = (EditText)findViewById(R.id.edit_bill);
String value = text.getText().toString();

如果您此时记录/打印，是否会返回任何内容value？

于 2012-06-01T20:40:01.693 回答
2

看起来您正在尝试从空字符串解析浮点数。在使用输入之前，您需要对输入进行一些健全性检查，或者至少围绕诸如 Float.parseFloat 之类的函数进行检查，这可能会因 Try-Catch（在这种情况下为 NumberFormatException）而失败，为用户提供某种有用的反馈（干杯，也许）。

于 2012-06-01T20:47:50.717 回答
0

你确定你已经在 AndroidManifest.xml 中声明了 TippingActivity 吗？

于 2012-10-05T20:39:15.543 回答