Android应用程序在打开后立即崩溃

Question

我正在开发我的第一个Android应用程序。它几乎是一个基本的小费计算器。出于某种原因，我无法让Eclipse认识到已插入电话，因此我无法通过Eclipse对其进行调试。 （我已经按照这里的所有步骤无效：http://developer.android.com/tools/extras/oem-usb.html）我已经在模拟器上成功安装了它，但每当我打开它时，它立即崩溃。我已尝试使用两种不同的XML布局，我将在下面发布，但我对我的应用可能崩溃的原因感兴趣。它很简单;只有一项活动，但我找不到错误。我知道它看起来太过分了，但任何帮助都非常感激。谢谢大家。

应用代码：

    package com.teamjava.theultimatetipconverter;

import android.app.Activity;
import android.os.Bundle;
//import android.view.Menu;
//import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
//import android.os.Build;
//import android.app.ActionBar;

public class MainActivity extends Activity {

    //create elements
    private Button mCalculate;
    private RadioButton mStupendous;
    private RadioButton mAboveAverage;
    private RadioButton mStandard;
    private RadioButton mSubpar;
    private EditText mCost;
    private EditText mTip;
    private EditText mTotal;
    private RadioGroup mRadioGroup;

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

        mCalculate = (Button)findViewById(R.id.calculate);
        mStupendous = (RadioButton)findViewById(R.id.radio0);
        mAboveAverage = (RadioButton)findViewById(R.id.radio2);
        mStandard = (RadioButton)findViewById(R.id.radio1);
        mSubpar = (RadioButton)findViewById(R.id.radio4);
    mRadioGroup = (RadioGroup)findViewById(R.id.radioGroup1);
        mRadioGroup.addView(mStupendous);
        mRadioGroup.addView(mAboveAverage);
        mRadioGroup.addView(mStandard);
        mRadioGroup.addView(mSubpar);
        mRadioGroup.check(R.id.radio1);

        mCost = (EditText)findViewById(R.id.EditText01);
        mTip = (EditText)findViewById(R.id.editText5);
        mTotal = (EditText)findViewById(R.id.editText6);


        mCalculate.setOnClickListener((new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(mStupendous.isSelected()){
                    double bill = Double.valueOf(mCost.toString());
                    String billString = String.valueOf(bill * .25);
                    mTip.setText("$" + billString);
                    mTotal.setText("$" + String.valueOf((bill + Double.parseDouble(billString))));
                }

                else if(mAboveAverage.isSelected()){
                    double bill = Double.valueOf(mCost.toString());
                    String billString = String.valueOf(bill * .2);
                    mTip.setText("$" + billString);
                    mTotal.setText("$" + String.valueOf((bill + Double.parseDouble(billString))));
                }

                else if(mStandard.isSelected()){
                    double bill = Double.valueOf(mCost.toString());
                    String billString = String.valueOf(bill * .15);
                    mTip.setText("$" + billString);
                    mTotal.setText("$" + String.valueOf((bill + Double.parseDouble(billString))));
                }

                else if(mSubpar.isSelected()){
                    double bill = Double.valueOf(mCost.toString());
                    String billString = String.valueOf(bill * .1);
                    mTip.setText("$" + billString);
                    mTotal.setText("$" + String.valueOf((bill + Double.parseDouble(billString))));
                }
            }
        }));
    }
}

Android清单文件：

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.teamjava.theultimatetipconverter"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.teamjava.theultimatetipconverter.MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

XML Layout one：

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:columnCount="3"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/calculate"
        android:layout_width="wrap_content"
        android:layout_column="2"
        android:layout_gravity="left"
        android:layout_row="6"
        android:layout_rowSpan="2"
        android:gravity="center_vertical|center_horizontal|left"
        android:text="@string/calculate" />

    <TextView
        android:id="@+id/textView4"
        android:layout_column="0"
        android:layout_gravity="left|bottom"
        android:layout_row="8"
        android:text="@string/suggestedTip"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <EditText
        android:id="@+id/editText5"
        android:layout_width="130dp"
        android:layout_column="2"
        android:layout_gravity="left"
        android:layout_row="8"
        android:layout_rowSpan="2"
        android:ems="10"
        android:inputType="none|numberDecimal" />

    <TextView
        android:id="@+id/textView5"
        android:layout_column="0"
        android:layout_gravity="left"
        android:layout_row="10"
        android:text="@string/totalBill"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <EditText
        android:id="@+id/editText6"
        android:layout_width="130dp"
        android:layout_column="2"
        android:layout_gravity="left"
        android:layout_row="10"
        android:ems="10"
        android:inputType="none|numberDecimal" />

    <Space
        android:layout_width="105dp"
        android:layout_height="1dp"
        android:layout_column="0"
        android:layout_row="0" />

    <Space
        android:layout_width="26dp"
        android:layout_height="1dp"
        android:layout_column="2"
        android:layout_row="0" />

    <Space
        android:layout_width="187dp"
        android:layout_height="1dp"
        android:layout_column="2"
        android:layout_row="0" />

    <Space
        android:layout_width="1dp"
        android:layout_height="112dp"
        android:layout_column="0"
        android:layout_row="0" />

    <Space
        android:layout_width="1dp"
        android:layout_height="28dp"
        android:layout_column="0"
        android:layout_row="1" />

    <Space
        android:layout_width="1dp"
        android:layout_height="38dp"
        android:layout_column="0"
        android:layout_row="2" />

    <Space
        android:layout_width="1dp"
        android:layout_height="63dp"
        android:layout_column="0"
        android:layout_row="3" />

    <Space
        android:layout_width="1dp"
        android:layout_height="24dp"
        android:layout_column="0"
        android:layout_row="5" />

    <Space
        android:layout_width="1dp"
        android:layout_height="32dp"
        android:layout_column="0"
        android:layout_row="6" />

    <Space
        android:layout_width="1dp"
        android:layout_height="32dp"
        android:layout_column="0"
        android:layout_row="7" />

    <Space
        android:layout_width="1dp"
        android:layout_height="27dp"
        android:layout_column="0"
        android:layout_row="8" />

    <Space
        android:layout_width="1dp"
        android:layout_height="37dp"
        android:layout_column="0"
        android:layout_row="9" />

    <Space
        android:layout_width="1dp"
        android:layout_height="62dp"
        android:layout_column="0"
        android:layout_row="10" />

    <Space
        android:layout_width="24dp"
        android:layout_height="15dp"
        android:layout_column="1"
        android:layout_row="0" />

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_column="0"
        android:layout_gravity="left|top"
        android:layout_row="4" >

        <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/standard" />
    </RadioGroup>

    <RadioButton
        android:id="@+id/radio0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="0"
        android:layout_gravity="left|center_vertical"
        android:layout_row="3"
        android:checked="true"
        android:text="@string/stupendous" />

    <RadioButton
        android:id="@+id/radio2"
        android:layout_width="128dp"
        android:layout_height="wrap_content"
        android:layout_column="2"
        android:layout_gravity="left|center_vertical"
        android:layout_row="3"
        android:text="@string/aboveAverage" />

    <EditText
        android:id="@+id/EditText01"
        android:layout_width="126dp"
        android:layout_column="2"
        android:layout_gravity="left|bottom"
        android:layout_row="0"
        android:ems="10"
        android:inputType="numberDecimal" >

        <requestFocus />
    </EditText>

    <RadioButton
        android:id="@+id/radio4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="2"
        android:layout_gravity="left|top"
        android:layout_row="4"
        android:text="@string/subpar" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="136dp"
        android:layout_height="37dp"
        android:layout_column="0"
        android:layout_gravity="center_horizontal|top"
        android:layout_row="0"
        android:text="@string/tipConverter"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textView2"
        android:layout_height="39dp"
        android:layout_column="0"
        android:layout_gravity="left|bottom"
        android:layout_row="0"
        android:text="@string/costOfMeal"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="120dp"
        android:layout_column="0"
        android:layout_gravity="left|center_vertical"
        android:layout_row="2"
        android:text="@string/serviceQuality"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</GridLayout>

XML布局二：

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
    android:id="@+id/widget0"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffffff"
    xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="23dp"
    android:text="Cost of Meal"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:layout_x="2dp"
    android:layout_y="7dp" />
<EditText
    android:id="@+id/EditText01"
    android:layout_width="130dp"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:numeric="decimal"
    android:layout_x="179dp"
    android:layout_y="7dp" />
<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="27dp"
    android:text="How was your service?"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:layout_x="4dp"
    android:layout_y="52dp" />
<RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_width="198dp"
    android:layout_height="191dp"
    android:layout_x="2dp"
    android:layout_y="82dp">
<RadioButton
    android:id="@+id/radio0"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Stupendous"
    android:textColor="#ff000000" />
<RadioButton
    android:id="@+id/radio2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Above Average"
    android:textColor="#ff000000" />
<RadioButton
    android:id="@+id/radio1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Standard"
    android:textColor="#ff000000" />
<RadioButton
    android:id="@+id/radio4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Subpar"
    android:textColor="#ff000000" />
</RadioGroup>
<TextView
    android:id="@+id/textView4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Suggested Tip"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:layout_x="2dp"
    android:layout_y="353dp" />
<TextView
    android:id="@+id/textView5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Total Bill"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:layout_x="2dp"
    android:layout_y="396dp" />
<EditText
    android:id="@+id/editText5"
    android:layout_width="107dp"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:numeric="decimal"
    android:layout_x="191dp"
    android:layout_y="345dp" />
<EditText
    android:id="@+id/editText6"
    android:layout_width="107dp"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:textColor="#ff000000"
    android:password="true"
    android:numeric="decimal"
    android:layout_x="190dp"
    android:layout_y="389dp" />
<Button
    android:id="@+id/widget46"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Calculate"
    android:textSize="18sp"
    android:layout_x="204dp"
    android:layout_y="284dp" />
</AbsoluteLayout>

编辑：以下是LogCat的错误日志：

05-07 23:09:09.732: D/dalvikvm(2112): GC_FOR_ALLOC freed 64K, 4% free 3523K/3664K, paused 29ms, total 34ms
05-07 23:09:09.902: D/dalvikvm(2112): GC_FOR_ALLOC freed 12K, 3% free 3950K/4064K, paused 27ms, total 30ms
05-07 23:09:10.032: D/AndroidRuntime(2112): Shutting down VM
05-07 23:09:10.032: W/dalvikvm(2112): threadid=1: thread exiting with uncaught exception (group=0xb0d40b20)
05-07 23:09:10.042: E/AndroidRuntime(2112): FATAL EXCEPTION: main
05-07 23:09:10.042: E/AndroidRuntime(2112): Process: com.teamjava.theultimatetipconverter, PID: 2112
05-07 23:09:10.042: E/AndroidRuntime(2112): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.teamjava.theultimatetipconverter/com.teamjava.theultimatetipconverter.MainActivity}: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread.access$800(ActivityThread.java:135)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.os.Handler.dispatchMessage(Handler.java:102)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.os.Looper.loop(Looper.java:136)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread.main(ActivityThread.java:5017)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at java.lang.reflect.Method.invokeNative(Native Method)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at java.lang.reflect.Method.invoke(Method.java:515)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at dalvik.system.NativeStart.main(Native Method)
05-07 23:09:10.042: E/AndroidRuntime(2112): Caused by: java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.view.ViewGroup.addViewInner(ViewGroup.java:3562)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.view.ViewGroup.addView(ViewGroup.java:3415)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.widget.RadioGroup.addView(RadioGroup.java:141)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.view.ViewGroup.addView(ViewGroup.java:3360)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.view.ViewGroup.addView(ViewGroup.java:3336)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at com.teamjava.theultimatetipconverter.MainActivity.onCreate(MainActivity.java:39)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.Activity.performCreate(Activity.java:5231)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-07 23:09:10.042: E/AndroidRuntime(2112):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
05-07 23:09:10.042: E/AndroidRuntime(2112):     ... 11 more

Answer 1

你有一件事就是在这里你说mCalculate是一个Button。

private Button mCalculate;

并将布局的视图R.id.button1实例化为Button

mCalculate = (Button)findViewById(R.id.button1);

但你的布局说R.id.button是一个GridLayout：

<GridLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnCount="3"
android:orientation="horizontal" >

我认为你想要实例化Button视图R.id.calculate

 mCalculate = (Button)findViewById(R.id.calculate);

同样，当执行失败时，请在DDMS视图中看到Logcat并发布错误日志。它有重要的信息可以解决问题。

我认为问题是你试图将radiobuttons添加到radiogroup，但是radiobuttons已经有了一个父，它在布局文件中定义。

尝试，而不是在布局中的第一个单选按钮后关闭Radiogroup标签，将所有单选按钮放在一起并在最后一个之后关闭标签。并从程序中删除所有mRadioGroup.addView（...）。

    <RadioGroup
    android:id="@+id/radioGroup1"
    android:layout_column="0"
    android:layout_gravity="left|top"
    android:layout_row="4" >

    <RadioButton
        android:id="@+id/radio1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/standard" />


    <RadioButton
        android:id="@+id/radio0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="0"
        android:layout_gravity="left|center_vertical"
        android:layout_row="3"
        android:checked="true"
        android:text="@string/stupendous" />

    <RadioButton
        android:id="@+id/radio2"
        android:layout_width="128dp"
        android:layout_height="wrap_content"
        android:layout_column="2"
        android:layout_gravity="left|center_vertical"
        android:layout_row="3"
        android:text="@string/aboveAverage" />
    <RadioButton
        android:id="@+id/radio4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_column="2"
        android:layout_gravity="left|top"
        android:layout_row="4"
        android:text="@string/subpar" />
</RadioGroup>