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我是 android 应用程序开发的新手。我正在用一个简单的应用程序练习一些基础知识。我能够从我的应用程序的主屏幕启动一个活动，但是，当我尝试使用相同的方法从 activity2 启动第三个活动时，该应用程序无法运行。

protected void onCreate(Bundle savedInstanceState) {

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

    Button anthiasButton = (Button)findViewById(R.id.anthiasButton);
    anthiasButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            Intent intent = new Intent(FishActivity.this, AnthiasActivity.class);
            startActivity(intent);
        }
    });


        if (savedInstanceState == null) {
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.container, new PlaceholderFragment()).commit();
        }
    }



<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.kdc.reeffishguide"
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.kdc.reeffishguide.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="com.kdc.reeffishguide.FishActivity"
        android:label="@string/title_activity_fish" >
    </activity>
    <activity
        android:name="com.kdc.reeffishguide.CoralActivity"
        android:label="@string/title_activity_coral" >
    </activity>
    <activity
        android:name="com.kdc.reeffishguide.InvertsActivity"
        android:label="@string/title_activity_inverts" >
    </activity>

    <activity
        android:name="com.kdc.reeffishguide.AnthiasActivity"
        android:label="@string/title_activity_anthias" >
    </activity>
</application>

</manifest>

我正在尝试从 FishActivity 打开 AnthiasActivity。eclipse 中没有给出错误或警告，但是当我运行应用程序并单击 FishActivity 时，应用程序会关闭。当我删除 fish Activity 中负责启动 anthias Activity 的代码部分时，fish Activity 会打开，但显然我无法进入 Anthias Activity

package com.kdc.reeffishguide;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;

public class AnthiasActivity extends ActionBarActivity {

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

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new     PlaceholderFragment()).commit();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.anthias, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_anthias,
                container, false);
        return rootView;
    }
}

}

这是 logcat 错误。

04-12 19:24:32.427: E/QcrilMsgTunnelSocket(22517): IOExceptionjava.io.IOException: No     such file or directoryReason: No such file or directory
04-12 19:24:36.421: E/QcrilMsgTunnelSocket(22517): IOExceptionjava.io.IOException: No     such file or directoryReason: No such file or directory
04-12 19:24:40.425: E/QcrilMsgTunnelSocket(22517): IOExceptionjava.io.IOException: No     such file or directoryReason: No such file or directory
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