无法实例化活动。未找到dexpath列表

Question

我试图从资产文件夹中读取rtf文件。这是我的logcat错误报告。我尝试了很多来解决它。将sdk版本更改为19.

03-09 08:49:24.300: E/AndroidRuntime(1035): FATAL EXCEPTION: main
03-09 08:49:24.300: E/AndroidRuntime(1035): Process: com.example.ipraxis, PID: 1035
03-09 08:49:24.300: E/AndroidRuntime(1035): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.ipraxis/com.example.ipraxis.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.example.ipraxis.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.ipraxis-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.ipraxis-1, /system/lib]]
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2123)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2258)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread.access$800(ActivityThread.java:138)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1209)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.os.Handler.dispatchMessage(Handler.java:102)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.os.Looper.loop(Looper.java:136)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread.main(ActivityThread.java:5026)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at java.lang.reflect.Method.invokeNative(Native Method)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at java.lang.reflect.Method.invoke(Method.java:515)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:602)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at dalvik.system.NativeStart.main(Native Method)
03-09 08:49:24.300: E/AndroidRuntime(1035): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.example.ipraxis.MainActivity" on path: DexPathList[[zip file "/data/app/com.example.ipraxis-1.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.ipraxis-1, /system/lib]]
03-09 08:49:24.300: E/AndroidRuntime(1035):     at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at java.lang.ClassLoader.loadClass(ClassLoader.java:497)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at java.lang.ClassLoader.loadClass(ClassLoader.java:457)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.Instrumentation.newActivity(Instrumentation.java:1061)
03-09 08:49:24.300: E/AndroidRuntime(1035):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2114)
03-09 08:49:24.300: E/AndroidRuntime(1035):     ...

的AndroidManifest.xml

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

    <uses-sdk
        android:minSdkVersion="8"
        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.example.ipraxis.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>

   </application>

</manifest>

MainActivity.java

package com.example.ipraxis;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;



public class MainActivity extends FragmentActivity  {

     private FragmentTabHost mTabHost;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);


        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent);

        mTabHost.addTab(
                mTabHost.newTabSpec("tab1").setIndicator("Reasoning", null),
                FragmentTab.class, null);
        mTabHost.addTab(
                mTabHost.newTabSpec("tab2").setIndicator("GK", null),
                FragmentTab.class, null);
        mTabHost.addTab(
                mTabHost.newTabSpec("tab3").setIndicator("English", null),
                FragmentTab.class, null);
        mTabHost.addTab(
                mTabHost.newTabSpec("tab4").setIndicator("Computer", null),
                FragmentTab.class, null);
        mTabHost.addTab(
                mTabHost.newTabSpec("tab5").setIndicator("Apps", null),
                FragmentTab.class, null);


    }

}

FragmentActivity.java

package com.example.ipraxis;

import java.io.IOException;
import java.io.InputStream;


import com.lowagie.text.Document;
import com.lowagie.text.rtf.parser.RtfParser;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class FragmentTab extends Fragment {


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


    }   



  @Override
    public View onCreateView (LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState)
    {

        View rootView = inflater.inflate (R.layout.fragment_layout,container,false);
        TextView tv = (TextView) rootView.findViewById (R.id.directions);
InputStream istr = null;

        try {
            istr = (InputStream) getActivity().getAssets().open("Hellooo.rtf");
            Document document = new Document();
            document.open();
            RtfParser parser = new RtfParser(null);
           parser.convertRtfDocument(istr,document);

    } catch (IOException e1) {
        // TODO Auto-generated catch block
        e1.printStackTrace();

    };
        return rootView;

        } 


 }  

请帮助我修复错误。