java.lang.RuntimeException:无法实例化活动ComponentInfo {com.example.projectmobilecloud/com.example.projectmobilecloud.MainActivity}: [英] java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.projectmobilecloud/com.example.projectmobilecloud.MainActivity}:

问题描述

lang.RuntimeException:无法实例化活动ComponentInfo"

lang.RuntimeException: Unable to instantiate activity ComponentInfo"

我正在搜索很多相同的案例并试图修复它，但是对于android的初学者来说确实很难解决此问题.

I was searching a lot of same case and tried to fix it, but it is really hard to fix this problem for beginner of android.

我遇到类似的错误

11-14 23:42:20.624:E/AndroidRuntime(1069):致命异常:主 11-14 23:42:20.624:E/AndroidRuntime(1069):java.lang.RuntimeException:无法实例化活动ComponentInfo {com.example.projectmobilecloud/com.example.projectmobilecloud.MainActivity}:java.lang.ClassNotFoundException:com .example.projectmobilecloud.MainActivity 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 11-14 23:42:20.624:E/AndroidRuntime(1069):at android.app.ActivityThread.access $ 600(ActivityThread.java:130) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1195) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.os.Handler.dispatchMessage(Handler.java:99) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.os.Looper.loop(Looper.java:137) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.ActivityThread.main(ActivityThread.java:4745) 11-14 23:42:20.624:E/AndroidRuntime(1069):at java.lang.reflect.Method.invokeNative(本机方法) 11-14 23:42:20.624:E/AndroidRuntime(1069):at java.lang.reflect.Method.invoke(Method.java:511) 11-14 23:42:20.624:E/AndroidRuntime(1069):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:786) 11-14 23:42:20.624:E/AndroidRuntime(1069):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-14 23:42:20.624:E/AndroidRuntime(1069):在dalvik.system.NativeStart.main(本机方法) 11-14 23:42:20.624:E/AndroidRuntime(1069):原因:java.lang.ClassNotFoundException:com.example.projectmobilecloud.MainActivity 11-14 23:42:20.624:E/AndroidRuntime(1069):在dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) 11-14 23:42:20.624:E/AndroidRuntime(1069):at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 11-14 23:42:20.624:E/AndroidRuntime(1069):at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.Instrumentation.newActivity(Instrumentation.java:1053) 11-14 23:42:20.624:E/AndroidRuntime(1069):位于android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 11-14 23:42:20.624:E/AndroidRuntime(1069):...还有11个

11-14 23:42:20.624: E/AndroidRuntime(1069): FATAL EXCEPTION: main 11-14 23:42:20.624: E/AndroidRuntime(1069): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.projectmobilecloud/com.example.projectmobilecloud.MainActivity}: java.lang.ClassNotFoundException: com.example.projectmobilecloud.MainActivity 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread.access$600(ActivityThread.java:130) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.os.Handler.dispatchMessage(Handler.java:99) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.os.Looper.loop(Looper.java:137) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread.main(ActivityThread.java:4745) 11-14 23:42:20.624: E/AndroidRuntime(1069): at java.lang.reflect.Method.invokeNative(Native Method) 11-14 23:42:20.624: E/AndroidRuntime(1069): at java.lang.reflect.Method.invoke(Method.java:511) 11-14 23:42:20.624: E/AndroidRuntime(1069): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 11-14 23:42:20.624: E/AndroidRuntime(1069): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 11-14 23:42:20.624: E/AndroidRuntime(1069): at dalvik.system.NativeStart.main(Native Method) 11-14 23:42:20.624: E/AndroidRuntime(1069): Caused by: java.lang.ClassNotFoundException: com.example.projectmobilecloud.MainActivity 11-14 23:42:20.624: E/AndroidRuntime(1069): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) 11-14 23:42:20.624: E/AndroidRuntime(1069): at java.lang.ClassLoader.loadClass(ClassLoader.java:501) 11-14 23:42:20.624: E/AndroidRuntime(1069): at java.lang.ClassLoader.loadClass(ClassLoader.java:461) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.Instrumentation.newActivity(Instrumentation.java:1053) 11-14 23:42:20.624: E/AndroidRuntime(1069): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974) 11-14 23:42:20.624: E/AndroidRuntime(1069): ... 11 more

并在MainActivity.java上

and On the MainActivity.java

public class MainActivity extends Activity {

      public MainSelection_Tool mt = new MainSelection_Tool();
      private RadioGroup radioSexGroup;
      private RadioGroup radioWorkGroup;
      private RadioButton radioSexButton;
      private Button btnDisplay;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        addListenerOnButton();

    }

 public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
        public void addListenerOnButton() {

        radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
        radioWorkGroup = (RadioGroup) findViewById(R.id.radioWorkFlow);
        btnDisplay = (Button) findViewById(R.id.btnDisplay);
        btnDisplay.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                    // get selected radio button from radioGroup
                int selectedId = radioSexGroup.getCheckedRadioButtonId();
                int workflow_id = radioWorkGroup.getCheckedRadioButtonId();
                Intent GO_Control = new Intent(MainActivity.this,ControlActivity.class);
                int wf =    mt.Get_Option(workflow_id, 0);
                int si =    mt.Get_Option(selectedId, 1);
                System.out.println("Sel " + si + "  wf " + wf);
                Log.d("WORK", String.valueOf(wf));
                Log.d("Select", String.valueOf(si));

                startActivity(GO_Control);

            }

        });

      }

然后 我有AndroidManifest.xml文件...

And AndroidManifest.xml file I have...

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

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

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

</manifest>

说实话，我不确定如何解决它.

To be honest , I am not really sure how to fix it.

我只是从Google代码导入项目，然后尝试运行它.

I just import project from the google code and I tried to run it.

在我队友的笔记本电脑上，它工作正常.

From my teammate's laptop , it was working fine.

但是，当我签出并尝试运行它时.我没工作..

However, When I checked out and tried to run it. I didn't work..

推荐答案

如果您已更新到 ADTv17 或更高版本，则旧的 ProGuard 文件将为您完成此操作.创建一个新的空项目，然后查看project.properties和proguard-properties并相应地修改您的当前项目.

If you have updated to ADTv17 or above, the old ProGuard files will do this to you. Create a new empty project, and see project.properties and proguard-properties and modify your current project accordingly.

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