我一直在关注newboston android教程。我的应用程序在模拟器上运行，出现闪屏，然后是菜单。但这些活动都不适用于点击。
Menu.java
package com.thenewboston.travis;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
public class Menu extends ListActivity {
String classes[] = { "StartingPoint", "TextPlay", "Email", "Camera",
"example4", "example5", "example6" };
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(Menu.this,
android.R.layout.simple_list_item_1, classes));
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
String cheese = classes[position];
try {
Class ourClass = Class
.forName("com.thenewboston.travis. " + cheese);
Intent ourIntent = new Intent(Menu.this, ourClass);
startActivity(ourIntent);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}
Splash.java
package com.thenewboston.travis;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
public class Splash extends Activity {
MediaPlayer ourSong;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
ourSong = MediaPlayer
.create(Splash.this, R.raw.underwater_splash_small);
ourSong.start();
Thread timer = new Thread() {
public void run() {
try {
sleep(5000);
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
Intent openStartingPoint = new Intent(
"com.thenewboston.travis.MENU");
startActivity(openStartingPoint);
}
}
};
timer.start();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
ourSong.release();
finish();
}
}
的AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.thenewboston.travis"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".Splash"
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=".StartingPoint"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.thenewboston.travis.STARTINGPOINT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Menu"
android:label="@string/app_name" >
<intent-filter>
<action android:name="com.thenewboston.travis.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".TextPlay"
android:label="@string/app_name" >
</activity>
<activity
android:name=".Email"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
TextPlay.java
package com.thenewboston.travis;
import java.util.Random;
import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.text.InputType;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.ToggleButton;
public class TextPlay extends Activity implements View.OnClickListener {
Button chkCmd;
ToggleButton passTog;
EditText input;
TextView display;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.text);
baconAndEggs();
passTog.setOnClickListener(this);
chkCmd.setOnClickListener(this);
}
private void baconAndEggs() {
// TODO Auto-generated method stub
chkCmd = (Button) findViewById(R.id.bResults);
passTog = (ToggleButton) findViewById(R.id.tbPassword);
input = (EditText) findViewById(R.id.etCommands);
display = (TextView) findViewById(R.id.tvResults);
}
@Override
public void onClick(View view) {
// TODO Auto-generated method stub
switch (view.getId()) {
case R.id.bResults:
String check = input.getText().toString();
display.setText(check);
if (check.contentEquals("left")) {
display.setGravity(Gravity.LEFT);
} else if (check.contentEquals("center")) {
display.setGravity(Gravity.CENTER);
} else if (check.contentEquals("right")) {
display.setGravity(Gravity.RIGHT);
} else if (check.contentEquals("blue")) {
display.setTextColor(Color.BLUE);
} else if (check.contains("WTF")) {
Random crazy = new Random();
display.setText("WTF!!!");
display.setTextSize(crazy.nextInt(75));
display.setTextColor(Color.rgb(crazy.nextInt(265),
crazy.nextInt(265), crazy.nextInt(265)));
switch (crazy.nextInt(3)) {
case 0:
display.setGravity(Gravity.LEFT);
break;
case 1:
display.setGravity(Gravity.CENTER);
break;
case 2:
display.setGravity(Gravity.RIGHT);
break;
}
} else {
display.setText("invalid");
display.setGravity(Gravity.CENTER);
display.setTextColor(Color.WHITE);
}
break;
case R.id.tbPassword:
if (passTog.isChecked()) {
input.setInputType(InputType.TYPE_CLASS_TEXT
| InputType.TYPE_TEXT_VARIATION_PASSWORD);
} else {
input.setInputType(InputType.TYPE_CLASS_TEXT);
}
break;
}
}
}
logcat
12-03 17:46:24.512: DEBUG/AndroidRuntime(392): CheckJNI is ON
12-03 17:46:24.813: DEBUG/AndroidRuntime(392): --- registering native functions ---
12-03 17:46:25.932: DEBUG/dalvikvm(217): GC_EXPLICIT freed 130 objects / 7016 bytes in 90ms
12-03 17:46:26.243: DEBUG/PackageParser(59): Scanning package: /data/app/vmdl70360.tmp
12-03 17:46:26.662: DEBUG/dalvikvm(59): GC_FOR_MALLOC freed 16255 objects / 1127560 bytes in 113ms
12-03 17:46:27.793: DEBUG/dalvikvm(59): GC_FOR_MALLOC freed 14115 objects / 692520 bytes in 114ms
12-03 17:46:28.092: INFO/PackageManager(59): Removing non-system package:com.thenewboston.travis
12-03 17:46:28.092: INFO/ActivityManager(59): Force stopping package com.thenewboston.travis uid=10041
12-03 17:46:28.102: INFO/Process(59): Sending signal. PID: 380 SIG: 9
12-03 17:46:28.132: INFO/UsageStats(59): Unexpected resume of com.android.launcher while already resumed in com.thenewboston.travis
12-03 17:46:28.132: INFO/WindowManager(59): WIN DEATH: Window{4a25b718 com.thenewboston.travis/com.thenewboston.travis.Menu paused=false}
12-03 17:46:28.163: WARN/InputManagerService(59): Got RemoteException sending setActive(false) notification to pid 380 uid 10041
12-03 17:46:28.312: DEBUG/PackageManager(59): Scanning package com.thenewboston.travis
12-03 17:46:28.322: INFO/PackageManager(59): Package com.thenewboston.travis codePath changed from /data/app/com.thenewboston.travis-1.apk to /data/app/com.thenewboston.travis-2.apk; Retaining data and using new
12-03 17:46:28.322: INFO/PackageManager(59): /data/app/com.thenewboston.travis-2.apk changed; unpacking
12-03 17:46:28.372: DEBUG/installd(35): DexInv: --- BEGIN '/data/app/com.thenewboston.travis-2.apk' ---
12-03 17:46:29.422: DEBUG/dalvikvm(399): DexOpt: couldn't find field Landroid/app/Notification;.category
12-03 17:46:29.422: DEBUG/dalvikvm(399): DexOpt: couldn't find field Landroid/app/Notification;.fullScreenIntent
12-03 17:46:29.422: DEBUG/dalvikvm(399): DexOpt: couldn't find field Landroid/app/Notification;.actions
12-03 17:46:29.523: DEBUG/dalvikvm(399): DexOpt: couldn't find static field
12-03 17:46:29.523: DEBUG/dalvikvm(399): DexOpt: couldn't find field Landroid/graphics/BitmapFactory$Options;.inMutable
12-03 17:46:30.423: DEBUG/dalvikvm(399): DexOpt: load 329ms, verify 1027ms, opt 55ms
12-03 17:46:30.492: DEBUG/installd(35): DexInv: --- END '/data/app/com.thenewboston.travis-2.apk' (success) ---
12-03 17:46:30.492: WARN/PackageManager(59): Code path for pkg : com.thenewboston.travis changing from /data/app/com.thenewboston.travis-1.apk to /data/app/com.thenewboston.travis-2.apk
12-03 17:46:30.502: WARN/PackageManager(59): Resource path for pkg : com.thenewboston.travis changing from /data/app/com.thenewboston.travis-1.apk to /data/app/com.thenewboston.travis-2.apk
12-03 17:46:30.502: DEBUG/PackageManager(59): Activities: com.thenewboston.travis.Splash com.thenewboston.travis.StartingPoint com.thenewboston.travis.Menu com.thenewboston.travis.TextPlay com.thenewboston.travis.Email
12-03 17:46:30.512: INFO/ActivityManager(59): Force stopping package com.thenewboston.travis uid=10041
12-03 17:46:30.603: INFO/installd(35): move /data/dalvik-cache/data@app@com.thenewboston.travis-2.apk@classes.dex -> /data/dalvik-cache/data@app@com.thenewboston.travis-2.apk@classes.dex
12-03 17:46:30.603: DEBUG/PackageManager(59): New package installed in /data/app/com.thenewboston.travis-2.apk
12-03 17:46:30.713: INFO/ActivityManager(59): Force stopping package com.thenewboston.travis uid=10041
12-03 17:46:30.763: DEBUG/dalvikvm(116): GC_EXPLICIT freed 80 objects / 3536 bytes in 42ms
12-03 17:46:30.913: DEBUG/dalvikvm(158): GC_EXPLICIT freed 1971 objects / 100088 bytes in 137ms
12-03 17:46:31.042: DEBUG/dalvikvm(59): GC_EXPLICIT freed 7653 objects / 464840 bytes in 145ms
12-03 17:46:31.042: INFO/installd(35): unlink /data/dalvik-cache/data@app@com.thenewboston.travis-1.apk@classes.dex
12-03 17:46:31.062: WARN/RecognitionManagerService(59): no available voice recognition services found
12-03 17:46:31.062: DEBUG/AndroidRuntime(392): Shutting down VM
12-03 17:46:31.072: DEBUG/dalvikvm(392): Debugger has detached; object registry had 1 entries
12-03 17:46:31.452: DEBUG/AndroidRuntime(405): >>>>>>>>>>>>>> AndroidRuntime START <<<<<<<<<<<<<<
12-03 17:46:31.452: DEBUG/AndroidRuntime(405): CheckJNI is ON
12-03 17:46:31.563: DEBUG/AndroidRuntime(405): --- registering native functions ---
12-03 17:46:32.053: INFO/ActivityManager(59): Starting activity: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.thenewboston.travis/.Splash }
12-03 17:46:32.113: INFO/ActivityManager(59): Start proc com.thenewboston.travis for activity com.thenewboston.travis/.Splash: pid=411 uid=10041 gids={}
12-03 17:46:32.113: DEBUG/AndroidRuntime(405): Shutting down VM
12-03 17:46:32.123: DEBUG/dalvikvm(405): Debugger has detached; object registry had 1 entries
12-03 17:46:32.153: INFO/dalvikvm(405): JNI: AttachCurrentThread (from ???.???)
12-03 17:46:32.153: INFO/AndroidRuntime(405): NOTE: attach of thread 'Binder Thread #3' failed
12-03 17:46:32.213: DEBUG/dalvikvm(33): GC_EXPLICIT freed 262 objects / 10056 bytes in 112ms
12-03 17:46:32.323: DEBUG/dalvikvm(33): GC_EXPLICIT freed 22 objects / 968 bytes in 77ms
12-03 17:46:32.542: DEBUG/dalvikvm(33): GC_EXPLICIT freed 2 objects / 64 bytes in 193ms
12-03 17:46:32.772: DEBUG/dalvikvm(411): GC_EXTERNAL_ALLOC freed 1051 objects / 72808 bytes in 50ms
12-03 17:46:32.843: DEBUG/AudioSink(34): bufferCount (4) is too small and increased to 12
12-03 17:46:32.953: INFO/ActivityManager(59): Displayed activity com.thenewboston.travis/.Splash: 857 ms (total 857 ms)
12-03 17:46:34.285: ERROR/MP3Extractor(34): Unable to resync. Signalling end of stream.
12-03 17:46:37.873: INFO/ActivityManager(59): Starting activity: Intent { act=com.thenewboston.travis.MENU cmp=com.thenewboston.travis/.Menu }
12-03 17:46:38.353: INFO/ActivityManager(59): Displayed activity com.thenewboston.travis/.Menu: 438 ms (total 438 ms)
12-03 17:46:41.403: WARN/System.err(411): java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint
12-03 17:46:41.413: WARN/System.err(411): at java.lang.Class.classForName(Native Method)
12-03 17:46:41.423: WARN/System.err(411): at java.lang.Class.forName(Class.java:235)
12-03 17:46:41.423: WARN/System.err(411): at java.lang.Class.forName(Class.java:182)
12-03 17:46:41.433: WARN/System.err(411): at com.thenewboston.travis.Menu.onListItemClick(Menu.java:30)
12-03 17:46:41.433: WARN/System.err(411): at android.app.ListActivity$2.onItemClick(ListActivity.java:321)
12-03 17:46:41.453: WARN/System.err(411): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
12-03 17:46:41.453: WARN/System.err(411): at android.widget.ListView.performItemClick(ListView.java:3382)
12-03 17:46:41.453: WARN/System.err(411): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
12-03 17:46:41.463: WARN/System.err(411): at android.os.Handler.handleCallback(Handler.java:587)
12-03 17:46:41.463: WARN/System.err(411): at android.os.Handler.dispatchMessage(Handler.java:92)
12-03 17:46:41.463: WARN/System.err(411): at android.os.Looper.loop(Looper.java:123)
12-03 17:46:41.463: WARN/System.err(411): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-03 17:46:41.463: WARN/System.err(411): at java.lang.reflect.Method.invokeNative(Native Method)
12-03 17:46:41.473: WARN/System.err(411): at java.lang.reflect.Method.invoke(Method.java:521)
12-03 17:46:41.483: WARN/System.err(411): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-03 17:46:41.483: WARN/System.err(411): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-03 17:46:41.483: WARN/System.err(411): at dalvik.system.NativeStart.main(Native Method)
12-03 17:46:41.483: WARN/System.err(411): Caused by: java.lang.NoClassDefFoundError: com.thenewboston.travis. StartingPoint
12-03 17:46:41.493: WARN/System.err(411): ... 17 more
12-03 17:46:41.503: WARN/System.err(411): Caused by: java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint in loader dalvik.system.PathClassLoader[/data/app/com.thenewboston.travis-2.apk]
12-03 17:46:41.503: WARN/System.err(411): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
12-03 17:46:41.523: WARN/System.err(411): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
12-03 17:46:41.523: WARN/System.err(411): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
12-03 17:46:41.523: WARN/System.err(411): ... 17 more
12-03 17:46:42.342: WARN/System.err(411): java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint
12-03 17:46:42.342: WARN/System.err(411): at java.lang.Class.classForName(Native Method)
12-03 17:46:42.362: WARN/System.err(411): at java.lang.Class.forName(Class.java:235)
12-03 17:46:42.362: WARN/System.err(411): at java.lang.Class.forName(Class.java:182)
12-03 17:46:42.362: WARN/System.err(411): at com.thenewboston.travis.Menu.onListItemClick(Menu.java:30)
12-03 17:46:42.382: WARN/System.err(411): at android.app.ListActivity$2.onItemClick(ListActivity.java:321)
12-03 17:46:42.382: WARN/System.err(411): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
12-03 17:46:42.382: WARN/System.err(411): at android.widget.ListView.performItemClick(ListView.java:3382)
12-03 17:46:42.392: WARN/System.err(411): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
12-03 17:46:42.392: WARN/System.err(411): at android.os.Handler.handleCallback(Handler.java:587)
12-03 17:46:42.392: WARN/System.err(411): at android.os.Handler.dispatchMessage(Handler.java:92)
12-03 17:46:42.392: WARN/System.err(411): at android.os.Looper.loop(Looper.java:123)
12-03 17:46:42.392: WARN/System.err(411): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-03 17:46:42.412: WARN/System.err(411): at java.lang.reflect.Method.invokeNative(Native Method)
12-03 17:46:42.412: WARN/System.err(411): at java.lang.reflect.Method.invoke(Method.java:521)
12-03 17:46:42.412: WARN/System.err(411): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-03 17:46:42.412: WARN/System.err(411): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-03 17:46:42.422: WARN/System.err(411): at dalvik.system.NativeStart.main(Native Method)
12-03 17:46:42.422: WARN/System.err(411): Caused by: java.lang.NoClassDefFoundError: com.thenewboston.travis. StartingPoint
12-03 17:46:42.432: WARN/System.err(411): ... 17 more
12-03 17:46:42.442: WARN/System.err(411): Caused by: java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint in loader dalvik.system.PathClassLoader[/data/app/com.thenewboston.travis-2.apk]
12-03 17:46:42.442: WARN/System.err(411): at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
12-03 17:46:42.452: WARN/System.err(411): at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
12-03 17:46:42.462: WARN/System.err(411): at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
12-03 17:46:42.462: WARN/System.err(411): ... 17 more
12-03 17:46:42.792: WARN/System.err(411): java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint
12-03 17:46:42.792: WARN/System.err(411): at java.lang.Class.classForName(Native Method)
12-03 17:46:42.822: WARN/System.err(411): at java.lang.Class.forName(Class.java:235)
12-03 17:46:42.832: WARN/System.err(411): at java.lang.Class.forName(Class.java:182)
12-03 17:46:42.843: WARN/System.err(411): at com.thenewboston.travis.Menu.onListItemClick(Menu.java:30)
12-03 17:46:42.843: WARN/System.err(411): at android.app.ListActivity$2.onItemClick(ListActivity.java:321)
12-03 17:46:42.853: WARN/System.err(411): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
12-03 17:46:42.853: WARN/System.err(411): at android.widget.ListView.performItemClick(ListView.java:3382)
12-03 17:46:42.862: WARN/System.err(411): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696)
12-03 17:46:42.872: WARN/System.err(411): at android.os.Handler.handleCallback(Handler.java:587)
12-03 17:46:42.872: WARN/System.err(411): at android.os.Handler.dispatchMessage(Handler.java:92)
12-03 17:46:42.872: WARN/System.err(411): at android.os.Looper.loop(Looper.java:123)
12-03 17:46:42.872: WARN/System.err(411): at android.app.ActivityThread.main(ActivityThread.java:4627)
12-03 17:46:42.883: WARN/System.err(411): at java.lang.reflect.Method.invokeNative(Native Method)
12-03 17:46:42.883: WARN/System.err(411): at java.lang.reflect.Method.invoke(Method.java:521)
12-03 17:46:42.883: WARN/System.err(411): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
12-03 17:46:42.883: WARN/System.err(411): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
12-03 17:46:42.883: WARN/System.err(411): at dalvik.system.NativeStart.main(Native Method)
12-03 17:46:42.903: WARN/System.err(411): Caused by: java.lang.NoClassDefFoundError: com.thenewboston.travis. StartingPoint
答案 0 :(得分：1)
错误是：
java.lang.ClassNotFoundException: com.thenewboston.travis. StartingPoint
你的班级是
com.thenewboston.travis.StartingPoint
因此，当您获得课程时，请删除额外的空间：
Class ourClass = Class .forName("com.thenewboston.travis. " + cheese);
将其更改为：
Class ourClass = Class.forName("com.thenewboston.travis." + cheese);
希望这有帮助。