Question

我想在Android应用程序中从main.java（启动画面）转到Intro.java。但我收到以下错误......

thread exiting with uncaught exception (group=0x40015560)

这是我的代码......

main.java：

public class main extends Activity {
/** Called when the activity is first created. */

boolean _active = true;
final int _splashTime = 2000; // time to display the splash screen in ms

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.splash);



    // thread for displaying the SplashScreen
    Thread splashTread = new Thread()
    {
        @Override
        public void run()
        {
            try {
                int waited = 0;
                while(_active && (waited < _splashTime)) {
                    sleep(100);

                    // waited is incremented by 100 after every sleep for 100 ms
                    if(_active) {
                        waited += 100;
                    }
                }
            } 
            catch(InterruptedException e) {

            }
            finally {

                    finish();

                    Intent inte = new Intent(main.this, Intro.class);
                    startActivity(inte);
                    }
        }
    };

    splashTread.start();


}
// this is to skip splash screen by touch event
@Override
public boolean onTouchEvent(MotionEvent event) {
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
        _active = false;
    }
    return true;
}

}

Intro.java

public abstract class Intro extends Activity implements OnClickListener
{
/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) 
{
    Log.d("Error"," Intro Started ");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.intro);


     RelativeLayout layout = (RelativeLayout) findViewById(R.layout.intro);
     layout.setOnTouchListener(new OnTouchListener() {

    @Override
    public boolean onTouch(View arg0, MotionEvent arg1)
    {
         Log.d("Error"," Touch Listener set "); 

        Intent i=new Intent(Intro.this,features.class);  
        startActivity(i);
        return false;
    }


});
}
}

intro.java应该通过用户触摸来访问features.java ...

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ubuntu.app"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk android:minSdkVersion="10" />

<application
    android:icon="@drawable/ubundroid"
    android:label="@string/app_name" >
    <activity
        android:name=".main"
        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=".Intro" />
    <activity   android:name=".Feature"/>
</application>

</manifest>

Logcat：

 D/dalvikvm(1229): newInstance failed: p0 i0 [0 a1
 D/AndroidRuntime(1229): Shutting down VM
W/dalvikvm(1229): threadid=1: thread exiting with uncaught exception (group=0x40015560)
 E/AndroidRuntime(1229): FATAL EXCEPTION: main
 E/AndroidRuntime(1229): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ubuntu.app/        com.ubuntu.app.Intro}: java.lang.InstantiationException: com.ubuntu.app.Intro
 E/AndroidRuntime(1229):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1569)
E/AndroidRuntime(1229):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
E/AndroidRuntime(1229):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
E/AndroidRuntime(1229):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
 E/AndroidRuntime(1229):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(1229):     at android.os.Looper.loop(Looper.java:123)
 E/AndroidRuntime(1229):    at android.app.ActivityThread.main(ActivityThread.java:3683)
 E/AndroidRuntime(1229):    at java.lang.reflect.Method.invokeNative(Native Method)
 E/AndroidRuntime(1229):    at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(1229):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
E/AndroidRuntime(1229):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
E/AndroidRuntime(1229):     at dalvik.system.NativeStart.main(Native Method)
 E/AndroidRuntime(1229): Caused by: java.lang.InstantiationException: com.ubuntu.app.Intro
E/AndroidRuntime(1229):     at java.lang.Class.newInstanceImpl(Native Method)
 E/AndroidRuntime(1229):    at java.lang.Class.newInstance(Class.java:1409)
 E/AndroidRuntime(1229):    at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
 E/AndroidRuntime(1229):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1561)
 E/AndroidRuntime(1229):    ... 11 more

提前致谢...

=========================== EDITED =================== ==================

当我删除Intro.java中的所有触摸事件时，它开始运行。新的java文件是：

package com.ubuntu.app;

import android.app.Activity;



import android.os.Bundle;
import android.util.Log;



public  class Intro extends Activity
{
/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) 
{
    Log.d("Error"," Intro Started ");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.intro);

}
}

但我想通过触摸用户来获得正确的方式进入下一个活动..

Answer 1

使用

Intent i=new Intent(Intro.this,Feature.class);  
        startActivity(i);

而不是

 Intent i=new Intent(Intro.this,features.class);  
        startActivity(i);

或者如果功能是您的活动，那么也将其注册为清单：

<activity   android:name=".features"/>

Answer 2

无法实例化活动ComponentInfo {com.ubuntu.app/
com.ubuntu.app.Intro}：java.lang.InstantiationException： com.ubuntu.app.Intro

...

public abstract class Intro extends Activity implements OnClickListener

intro是一个抽象类，不能使它成为实例所以当你启动这个类时，android会尝试创建它会给出错误的实例

我想我必须编写代码

public  class Intro extends Activity implements OnClickListener
{
/** Called when the activity is first created. */

@Override
public void onCreate(Bundle savedInstanceState) 
{
    Log.d("Error"," Intro Started ");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.intro);

}

public void onClick(View v) {
    //handle button event 
} 
}

线程退出与未捕获的异常（组= 0x40015560）

2 个答案: