Question

我是Android开发的新手，所以如果这个问题看似微不足道，请原谅我。

我正在尝试在我的手机上运行我的Android应用程序（HTC One），但它在我使用键盘填充文本区域时停止工作。我知道eclipse提供的模拟器的修复，但有人可以请我在真实设备上使用它吗？

谢谢！

更新：请通过以下LogCat查找错误日志：

E/AndroidRuntime(24443): FATAL EXCEPTION: main

E/AndroidRuntime(24443): java.lang.NumberFormatException: Invalid double: "android.widget.EditText@421edb70"

E/AndroidRuntime(24443):    at java.lang.StringToReal.invalidReal(StringToReal.java:63)

E/AndroidRuntime(24443):    at java.lang.StringToReal.initialParse(StringToReal.java:114)

E/AndroidRuntime(24443):    at java.lang.StringToReal.parseDouble(StringToReal.java:263)

E/AndroidRuntime(24443):    at java.lang.Double.parseDouble(Double.java:295)

E/AndroidRuntime(24443):    at com.example.crazytipcalc.CrazyTipCalc.updateTipAndFinalBill(CrazyTipCalc.java:81)

E/AndroidRuntime(24443):    at com.example.crazytipcalc.CrazyTipCalc.access$1(CrazyTipCalc.java:79)

E/AndroidRuntime(24443):    at com.example.crazytipcalc.CrazyTipCalc$1.onTextChanged(CrazyTipCalc.java:73)

E/AndroidRuntime(24443):    at android.widget.TextView.sendOnTextChanged(TextView.java:7452)

E/AndroidRuntime(24443):    at android.widget.TextView.handleTextChanged(TextView.java:7511)

E/AndroidRuntime(24443):    at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:9317)

E/AndroidRuntime(24443):    at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:962)

E/AndroidRuntime(24443):    at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:496)

E/AndroidRuntime(24443):    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:212)

E/AndroidRuntime(24443):    at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:30)

E/AndroidRuntime(24443):    at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:94)

E/AndroidRuntime(24443):    at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:49)

E/AndroidRuntime(24443):    at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:155)

E/AndroidRuntime(24443):    at android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:189)

E/AndroidRuntime(24443):    at android.widget.TextView.doKeyDown(TextView.java:5432)

E/AndroidRuntime(24443):    at android.widget.TextView.onKeyDown(TextView.java:5250)

E/AndroidRuntime(24443):    at android.view.KeyEvent.dispatch(KeyEvent.java:2726)

E/AndroidRuntime(24443):    at android.view.View.dispatchKeyEvent(View.java:7142)

E/AndroidRuntime(24443):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1369)

E/AndroidRuntime(24443):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1369)

E/AndroidRuntime(24443):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1369)

E/AndroidRuntime(24443):    at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1369)

E/AndroidRuntime(24443):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2013)

E/AndroidRuntime(24443):    at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1490)

E/AndroidRuntime(24443):    at android.app.Activity.dispatchKeyEvent(Activity.java:2414)

E/AndroidRuntime(24443):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1940)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:4048)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl.deliverKeyEvent(ViewRootImpl.java:4004)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:3530)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:4648)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:4627)

E/AndroidRuntime(24443):    at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3347)

E/AndroidRuntime(24443):    at android.os.Handler.dispatchMessage(Handler.java:99)

E/AndroidRuntime(24443):    at android.os.Looper.loop(Looper.java:155)

E/AndroidRuntime(24443):    at android.app.ActivityThread.main(ActivityThread.java:5536)

E/AndroidRuntime(24443):    at java.lang.reflect.Method.invokeNative(Native Method)

E/AndroidRuntime(24443):    at java.lang.reflect.Method.invoke(Method.java:511)

E/AndroidRuntime(24443):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1074)

E/AndroidRuntime(24443):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:841)

E/AndroidRuntime(24443):    at dalvik.system.NativeStart.main(Native Method)

这是我的代码：

package com.example.crazytipcalc;

import android.os.Bundle;
import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Menu;
import android.widget.EditText;

public class CrazyTipCalc extends Activity {

    private static final String TOTAL_BILL = "TOTAL_BILL";
    private static final String CURRENT_TIP = "CURRENT_TIP";
    private static final String BILL_WITHOUT_TIP = "BILL_WITHOUT_TIP";

    private double billBeforeTip;
    private double tipAmount;
    private double finalBill;

    EditText billBeforeTipET;
    EditText tipAmountET;
    EditText finalBillET;


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

        if(savedInstanceState == null){
            billBeforeTip = 0.0;
            tipAmount = .15;
            finalBill = 0.0;
        } else{
            billBeforeTip = savedInstanceState.getDouble(BILL_WITHOUT_TIP);
            tipAmount = savedInstanceState.getDouble(CURRENT_TIP);
            finalBill = savedInstanceState.getDouble(TOTAL_BILL);
        }
        billBeforeTipET = (EditText) findViewById(R.id.billEditText);
        tipAmountET = (EditText) findViewById(R.id.tipEditText) ;
        finalBillET = (EditText) findViewById(R.id.finalBillEditText);

        billBeforeTipET.addTextChangedListener(billBeforeTipListener);

    }

    private TextWatcher billBeforeTipListener = new TextWatcher(){

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onTextChanged(CharSequence s, int arg1, int arg2,
                int arg3) {
            // TODO Auto-generated method stub
            try{
                billBeforeTip = Double.parseDouble(s.toString());

            } catch(NumberFormatException e){
                billBeforeTip = 0.0;
            }

            updateTipAndFinalBill();

        }

    };

    private void updateTipAndFinalBill(){

        double tipAmount = Double.parseDouble(tipAmountET.toString());

        double finalBill = billBeforeTip + (billBeforeTip*tipAmount);

        finalBillET.setText(String.format("%.02f", finalBill));
    }

    protected void onSaveInstanceState(Bundle outState){

        super.onSaveInstanceState(outState);

        outState.putDouble(TOTAL_BILL, finalBill);
        outState.putDouble(CURRENT_TIP, tipAmount);
        outState.putDouble(BILL_WITHOUT_TIP, billBeforeTip);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.crazy_tip_calc, menu);
        return true;
    }

}

Answer 1

问题在于：Double.parseDouble(tipAmountET.toString());
您需要将其替换为：Double.parseDouble(tipAmountET.getText().toString());

private void updateTipAndFinalBill() {

    try {
        double tipAmount = Double.parseDouble(tipAmountET.getText().toString());
        double finalBill = billBeforeTip + (billBeforeTip*tipAmount);

        finalBillET.setText(String.format("%.02f", finalBill));

    } catch(NumberFormatException e){
        /* Whatever you want to do when there is no tip amount. */
    }
}

Answer 2

问题出在这里

double tipAmount = Double.parseDouble(tipAmountET.toString());

这里你只是想将EditText转换为双格式的String。所以它无法获得任何价值，因此你就得到了错误。所以改变它

 double tipAmount = Double.parseDouble(tipAmountET.getText().toString());

Answer 3

在updateTipAndFinalBill()方法中，您要调用以下内容：

double tipAmount = Double.parseDouble(tipAmountET.toString());

首先，tipAmountET是EditText，因此该行应为：

double tipAmount = Double.parseDouble(tipAmountET.getText().toString());

其次，您应该使用try-catch块来围绕它，就像您在onTextChanged()的{{1}}方法中所做的那样。

TextWatcher

使用键盘时，Android应用程序在真实设备上崩溃

3 个答案: