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如果这是一个愚蠢的问题，那么我道歉：

这是我第一次尝试制作一个安卓应用程序，由于某种原因这不会启动。它总是在我单击它时立即关闭关于可能出现问题的任何想法？我迷路了。

package weight.Lifting.stuff;
import android.app.Activity;
import android.os.Bundle;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View;
public class MainActivity extends Activity 
{   
TextView weight100, weight95, weight90, weight85, weight80, weight75, weight70, weight65, weight60;
    EditText enterWeight, enterReps;

    double Weight=1,Reps=1,a=1,b=1,c=1,d=1,e=1,f=1,g=1,h=1,i=1,A=.95,B=.90,C=.85,D=.80,E=.75,F=.70,G=.65,H=.60,I=.333;

    @Override
    public void onCreate(Bundle savedInstanceState){ 

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main_activity__lifting);

        weight100 = (TextView) findViewById (R.id.textView3);
        weight95 = (TextView) findViewById (R.id.textView8);
        weight90 = (TextView) findViewById (R.id.textView9);
        weight85 = (TextView) findViewById (R.id.textView10);
        weight80 = (TextView) findViewById (R.id.textView11);
        weight75 = (TextView) findViewById (R.id.textView12);
        weight70 = (TextView) findViewById (R.id.textView15);
        weight65 = (TextView) findViewById (R.id.textView16);
        weight60 = (TextView) findViewById (R.id.textView17);

        enterWeight = (EditText) findViewById (R.id.editText1);
        enterReps = (EditText) findViewById (R.id.editText2);
    }



            public void onButton1Click (View v)
            {

                Weight = Double.parseDouble(enterWeight.getText().toString());
                Reps = Double.parseDouble(enterReps.getText().toString());

                a = ((Weight*I*Reps)+Weight);
                b = ((Weight*I*Reps)+Weight)*A;
                c = ((Weight*I*Reps)+Weight)*B;
                d = ((Weight*I*Reps)+Weight)*C;
                e = ((Weight*I*Reps)+Weight)*D;
                f = ((Weight*I*Reps)+Weight)*E;
                g = ((Weight*I*Reps)+Weight)*F;
                h = ((Weight*I*Reps)+Weight)*G;
                i = ((Weight*I*Reps)+Weight)*H;

                weight100.setText(Double.toString(a));
                weight95.setText(Double.toString(b));
                weight90.setText(Double.toString(c));
                weight85.setText(Double.toString(d));
                weight80.setText(Double.toString(e));
                weight75.setText(Double.toString(f));
                weight70.setText(Double.toString(g));
                weight65.setText(Double.toString(h));
                weight60.setText(Double.toString(i));
            }
    }

这是我的xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    tools:context=".MainActivity_Lifting" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="Enter Weight:" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@+id/textView2"
        android:layout_below="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/editText1"
        android:text="Enter Reps:" />

    <EditText
        android:id="@+id/editText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignRight="@+id/textView2"
        android:layout_below="@+id/textView2"
        android:ems="10" />

    <Button
        android:id="@+id/button1"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/editText2"
        android:focusableInTouchMode="true"
        android:gravity="center_vertical|center_horizontal|left"
        android:onClick="onButton1Click"
        android:text="Calculate"
        android:textSize="10sp" />

    <TextView
        android:id="@+id/textView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/editText1"
        android:layout_marginLeft="58dp"
        android:layout_toRightOf="@+id/editText1"
        android:text="95% (3 reps)" />

    <TextView
        android:id="@+id/textView5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/editText2"
        android:layout_alignLeft="@+id/textView4"
        android:text="90% (5 reps)" />

    <TextView
        android:id="@+id/textView6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView5"
        android:layout_alignTop="@+id/editText2"
        android:text="85% (6 reps)" />

    <TextView
        android:id="@+id/textView100"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/textView4"
        android:layout_alignRight="@+id/textView4"
        android:text="100% (1 rep)" />

    <TextView
        android:id="@+id/textView14"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView13"
        android:layout_below="@+id/textView13"
        android:text="70% (12 reps)" />

    <TextView
        android:id="@+id/textView18"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView14"
        android:layout_below="@+id/textView14"
        android:text="65% (15 reps)" />

    <TextView
        android:id="@+id/textView19"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView100"
        android:layout_below="@+id/textView18"
        android:text="60% (20 reps)" />

    <TextView
        android:id="@+id/textView13"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView7"
        android:layout_below="@+id/editText2"
        android:text="75% (10 reps)" />

    <TextView
        android:id="@+id/textView7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView100"
        android:layout_below="@+id/textView6"
        android:text="80% (8 reps)" />

    <TextView
        android:id="@+id/textView3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView100"
        android:layout_alignBottom="@+id/textView100"
        android:layout_toRightOf="@+id/textView7"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView3"
        android:layout_toRightOf="@+id/textView4"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView3"
        android:layout_below="@+id/textView4"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView10"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView6"
        android:layout_alignBottom="@+id/textView6"
        android:layout_alignLeft="@+id/textView8"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView11"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView6"
        android:layout_toRightOf="@+id/textView7"
        android:clickable="true"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView12"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView11"
        android:layout_toRightOf="@+id/textView13"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView15"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView12"
        android:layout_below="@+id/textView13"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView16"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView18"
        android:layout_alignBottom="@+id/textView18"
        android:layout_alignLeft="@+id/textView15"
        android:text="TextView" />

    <TextView
        android:id="@+id/textView17"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/textView19"
        android:layout_alignBottom="@+id/textView19"
        android:layout_alignLeft="@+id/textView16"
        android:text="TextView" />

</RelativeLayout>

编辑添加的清单 xml 和日志 cat

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="weight.Lifting.stuff"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" android:debuggable="true">
        <activity
            android:name="weight.Lifting.stuff.MainActivity_Lifting"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>

LogCat 输出：

02-01 01:49:15.962: W/Trace(785): Unexpected value from nativeGetEnabledTags: 0
02-01 01:49:15.962: W/Trace(785): Unexpected value from nativeGetEnabledTags: 0
02-01 01:49:15.983: W/dalvikvm(785): threadid=1: thread exiting with uncaught exception (group=0x40a70930)
02-01 01:49:16.003: E/AndroidRuntime(785): FATAL EXCEPTION: main
02-01 01:49:16.003: E/AndroidRuntime(785): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{weight.Lifting.stuff/weight.Lifting.stuff.MainActivity_Lifting}: java.lang.ClassNotFoundException: Didn't find class "weight.Lifting.stuff.MainActivity_Lifting" on path: /data/app/weight.Lifting.stuff-1.apk
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.os.Handler.dispatchMessage(Handler.java:99)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.os.Looper.loop(Looper.java:137)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread.main(ActivityThread.java:5039)
02-01 01:49:16.003: E/AndroidRuntime(785):  at java.lang.reflect.Method.invokeNative(Native Method)
02-01 01:49:16.003: E/AndroidRuntime(785):  at java.lang.reflect.Method.invoke(Method.java:511)
02-01 01:49:16.003: E/AndroidRuntime(785):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
02-01 01:49:16.003: E/AndroidRuntime(785):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
02-01 01:49:16.003: E/AndroidRuntime(785):  at dalvik.system.NativeStart.main(Native Method)
02-01 01:49:16.003: E/AndroidRuntime(785): Caused by: java.lang.ClassNotFoundException: Didn't find class "weight.Lifting.stuff.MainActivity_Lifting" on path: /data/app/weight.Lifting.stuff-1.apk
02-01 01:49:16.003: E/AndroidRuntime(785):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
02-01 01:49:16.003: E/AndroidRuntime(785):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
02-01 01:49:16.003: E/AndroidRuntime(785):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
02-01 01:49:16.003: E/AndroidRuntime(785):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
4

2 回答 2

0

当您尝试使用这些parseDouble方法时，它们可能会引发异常，因为您的 EditText 字段是空的/用字符串填充。但下一次，请显示 logcat :D

于 2013-02-01T01:26:24.167 回答
0

我重新创建了您的项目，它编译并运行没有问题。检查您的 AndroidManifest.xml 是否有问题。考虑将其与您的 LogCat 输出一起发布。

于 2013-02-01T01:35:32.373 回答