当我点击我的测验游戏的开始按钮时，它会转到此活动。我使用这个类随机输入一个数字并自动调用另一个活动。我不知道什么是错的，但是当这个课程运行时，我的应用程序就会强行关闭。我认为这是因为随机..请帮助我..你能建议另一种随机数字方式吗？感谢..
package com.example.feedyourmind;
import java.util.Random;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
public class LevelOne extends Activity {
Integer button;
ImageView iv;
protected View view;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_level_one);
Intent myIntent = new Intent();
Random rnd = new Random();
int screen = (int) rnd.nextInt(10)+1;
switch(screen){
case 1:
myIntent.setClass(this, Screen1.class);
break;
case 2:
myIntent.setClass(this, Screen2.class);
break;
case 3:
myIntent.setClass(this, Screen3.class);
break;
case 4:
myIntent.setClass(this, Screen4.class);
break;
case 5:
myIntent.setClass(this, Screen5.class);
break;
case 6:
myIntent.setClass(this, Screen6.class);
break;
case 7:
myIntent.setClass(this, Screen7.class);
break;
case 8:
myIntent.setClass(this, Screen8.class);
break;
case 9:
myIntent.setClass(this, Screen9.class);
break;
case 10:
myIntent.setClass(this, Screen10.class);
break;
}
startActivity(myIntent);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_level_one, menu);
return true;
}
}
这是我的日志猫：
02-04 08:46:11.628: E/AndroidRuntime(388): FATAL EXCEPTION: main
02-04 08:46:11.628: E/AndroidRuntime(388): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.feedyourmind/com.example.feedyourmind.LevelOne}: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.feedyourmind/com.example.feedyourmind.Screen9}; have you declared this activity in your AndroidManifest.xml?
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.os.Handler.dispatchMessage(Handler.java:99)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.os.Looper.loop(Looper.java:123)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread.main(ActivityThread.java:3683)
02-04 08:46:11.628: E/AndroidRuntime(388): at java.lang.reflect.Method.invokeNative(Native Method)
02-04 08:46:11.628: E/AndroidRuntime(388): at java.lang.reflect.Method.invoke(Method.java:507)
02-04 08:46:11.628: E/AndroidRuntime(388): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
02-04 08:46:11.628: E/AndroidRuntime(388): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
02-04 08:46:11.628: E/AndroidRuntime(388): at dalvik.system.NativeStart.main(Native Method)
02-04 08:46:11.628: E/AndroidRuntime(388): Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.feedyourmind/com.example.feedyourmind.Screen9}; have you declared this activity in your AndroidManifest.xml?
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.Activity.startActivityForResult(Activity.java:2827)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.Activity.startActivity(Activity.java:2933)
02-04 08:46:11.628: E/AndroidRuntime(388): at com.example.feedyourmind.LevelOne.onCreate(LevelOne.java:64)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-04 08:46:11.628: E/AndroidRuntime(388): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
02-04 08:46:11.628: E/AndroidRuntime(388): ... 11 more
答案 0 :(得分：1)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.feedyourmind"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="16" />
<application
android:allowBackup="true"
android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.feedyourmind.MainActivity"
android:label="@string/app_name"
android:screenOrientation="landscape" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.feedyourmind.Menu"
android:label="@string/title_activity_menu"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Menu1"
android:label="@string/title_activity_menu1"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.HelpBg"
android:label="@string/title_activity_help_bg"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.AboutUs"
android:label="@string/title_activity_about_us"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Help"
android:label="@string/title_activity_help"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.LevelOne"
android:label="@string/title_activity_level_one"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen1"
android:label="@string/title_activity_screen1"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen2"
android:label="@string/title_activity_screen2"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen3"
android:label="@string/title_activity_screen3"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen4"
android:label="@string/title_activity_screen4"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen5"
android:label="@string/title_activity_screen5"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen6"
android:label="@string/title_activity_screen6"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen7"
android:label="@string/title_activity_screen7"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen8"
android:label="@string/title_activity_screen8"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen9"
android:label="@string/title_activity_screen9"
android:screenOrientation="landscape" >
</activity>
<activity
android:name="com.example.feedyourmind.Screen10"
android:label="@string/title_activity_screen10"
android:screenOrientation="landscape" >
</activity>
</application>
</manifest>
答案 1 :(得分：0)
您应该在AndroidManifest.xml文件中声明您的活动。 整理所有活动，如
<activity android:name="com.example.feedyourmind.Screen1"/>
在mainifest文件中的应用程序标记内