我正在尝试在选择菜单项时启动另一个活动。但是，当我在手机上运行应用程序并按下任何菜单项时，应用程序会意外停止。
这是我试图开始的NewPlanet活动，例如：
package com.example.hello_world;
import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ImageView;
public class NewPlanet extends Activity
{
@Override
//onCreate method to start the app in system memory
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
//area to view the application content
setContentView(R.layout.activity_add);
//reference imageView UI element
ImageView marsImage = (ImageView) findViewById(R.id.imageMars);
//attach mars image to an event
//onClick listener interface needs to be implemented
marsImage.setOnClickListener(new View.OnClickListener()
{
@Override
//onClick method for mars image being implemented
public void onClick(View v)
{
//create new WorldGen instance
WorldGen mars = new WorldGen("Mars", 642, 3.7);
//add a colony to the mars object
mars.setPlanetColonies(1);
//destroy the object after use
finish();
}
});
}
//keyDown event handler
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
//check that if the x key has pressed down
//any event handler can still operate on this event
if (keyCode == KeyEvent.KEYCODE_X)
{
//return control from the function
finish();
return true;
}
return false;
}
}
这是包含菜单事件处理程序（onOptionsItemSelected）方法的活动我从以下位置启动NewPlanet活动：
package com.example.hello_world;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
public class MainActivity extends Activity
{
//new worldgen object
WorldGen earth = new WorldGen("Earth", 5973, 9.78);
@Override
//parameter contains all the saved states and settings of the UI.
protected void onCreate(Bundle savedInstanceState)
{
//passes in the UI states to the onCreate initialzing method.
super.onCreate(savedInstanceState);
////loads the XML layout definition via this method (specifies the directory).
setContentView(R.layout.activity_main);
//create new world object
WorldGen earth = new WorldGen("Earth", 5973, 9.78);
//add one colony to earth object
earth.setPlanetColonies(1);
//add a military base
earth.setPlanetMilitary(1);
//add 1000 immigrants to population
earth.setColonyImmigration(1000);
//add 100 soldiers
earth.setBaseProtection(100);
//turn the boolean force field on
earth.turnForceFieldOn();
}
//set up world start values
protected void setStartWorldValues()
{
}
//set up the start screen text
private void setUpScreenText()
{
//textview object holding the actual values.
//each textview object displays a different dataView
//planet name textView.
TextView planetNameValue = (TextView) findViewById (R.id.dataView1);
planetNameValue.setText(earth.planetName);
//planet mass textViewaq
TextView planetMassValue = (TextView) findViewById (R.id.dataView2);
planetMassValue.setText(earth.planetMass);
//planet gravity textView
TextView planetGravityValue = (TextView) findViewById (R.id.dataView3);
planetGravityValue.setText(String.valueOf(earth.planetGravity));
//planet colonies textView
TextView viewplanetColoniesValue = (TextView) findViewById (R.id.dataView4);
viewplanetColoniesValue.setText(String.valueOf(earth.planetColonies));
//planet population textView
TextView planetPopValue = (TextView) findViewById (R.id.dataView5);
planetPopValue.setText(String.valueOf(earth.planetPopulation));
//planet military textView
TextView planetMilitaryValue = (TextView) findViewById (R.id.dataView6);
planetMilitaryValue.setText(String.valueOf(earth.planetMilitary));
//planet bases textView
TextView planetBasesValue = (TextView) findViewById (R.id.dataView7);
planetBasesValue.setText(String.valueOf(earth.planetBases));
//planet forcefield state textView
TextView planetFieldValue = (TextView) findViewById (R.id.dataView8);
planetFieldValue.setText(String.valueOf(earth.getForceFieldState()));
}
@Override
//inflates the menu with user defined xml menu file using the CreateOptionsMenu method
//
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
//return value for a properly implemented menu resource
return true;
}
@Override
//decide what menu item has been selected
public boolean onOptionsItemSelected(MenuItem item)
{
//switch statement to determine which menu item was selected by ID
switch (item.getItemId())
{
//menu add selected
case R.id.menu_add:
//explicit intent instance
//call startActivity static method and start the class
Intent intent_add = new Intent(this, NewPlanet.class);
this.startActivity(intent_add);
break;
//config method selected
case R.id.menu_config:
//call startActivity static method and start the class
Intent intent_config = new Intent(this, ConfigPlanet.class);
this.startActivity(intent_config);
break;
case R.id.menu_travel:
//call startActivity static method and start the class
Intent intent_travel = new Intent(this, TravelPlanet.class);
this.startActivity(intent_travel);
break;
case R.id.menu_attack:
//call startActivity static method and start the class
Intent intent_attack = new Intent(this, AttackPlanet.class);
this.startActivity(intent_attack);
break;
default:
//return control back to the superclass - like a return false
return super.onOptionsItemSelected(item);
}
//return true for success
return true;
}
}
这是我的错误日志文件（刚刚运行的错误/警告）：
eclipse.buildId=v22.3.0-887826
java.version=1.7.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_GB
Framework arguments: -product com.android.ide.eclipse.adt.package.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product com.android.ide.eclipse.adt.package.product
Warning
Sat Dec 07 15:37:17 GMT 2013
Warning: The environment variable HOME is not set. The following directory will be used to store the Git
user global configuration and to define the default location to store repositories: 'C:\Users\namso1902'. If this is
not correct please set the HOME environment variable and restart Eclipse. Otherwise Git for Windows and
EGit might behave differently since they see different configuration options.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.
eclipse.buildId=v22.3.0-887826
java.version=1.7.0_45
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_GB
Framework arguments: -product com.android.ide.eclipse.adt.package.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product com.android.ide.eclipse.adt.package.product
Warning
Sat Dec 07 15:37:17 GMT 2013
Warning: EGit couldn't detect the installation path "gitPrefix" of native Git. Hence EGit can't respect system level
Git settings which might be configured in ${gitPrefix}/etc/gitconfig under the native Git installation directory.
The most important of these settings is core.autocrlf. Git for Windows by default sets this parameter to true in
this system level configuration. The Git installation location can be configured on the
Team > Git > Configuration preference page's 'System Settings' tab.
This warning can be switched off on the Team > Git > Confirmations and Warnings preference page.
这是xml清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hello_world"
android:versionCode="1"
android:versionName="1.0" >
<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.hello_world.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.example.hello_world.NewPlanet"/>
<activity android:name="com.example.hello_world.ConfigPlanet"/>
<activity android:name="com.example.hello_world.TravelPlanet"/>
<activity android:name="com.example.hello_world.AttackPlanet"/>
</application>
</manifest>
无法获得堆栈跟踪抱歉。
提前致谢
答案 0 :(得分：1)
您的包裹名称是
package="com.example.hello_world" // in manifest
但你有
<activity android:name="chapter.two.hello_World.NewPlanet"/>
<activity android:name="chapter.two.hello_World.ConfigPlanet"/>
<activity android:name="chapter.two.hello_World.TravelPlanet"/>
<activity android:name="chapter.two.hello_World.AttackPlanet"/>
应该是
<activity android:name="com.example.hello_world.NewPlanet"/>
//similar for other activities if it is in package com.example.hello_world;
因为你的包裹名称是
package com.example.hello_world; // for NewPlanet