安卓新手上路，求问各路大神ava.lang.ClassNotFoundException与java.lang.RuntimeException是什么原因

sinat_23870319 2015-09-09 02:29:30
小弟刚刚才开始学java与安卓，这次老师布置的作业发现编译能通过，但是不能运行。logcat一看是这样的

好吧，当时我的内心是崩溃的
然后开始着手解决，但是发现那几个Exception都没办法独立解决。。无奈之下，只好来这里请教各位大神，还希望各位不吝赐教Orz
这是Manifest
<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.stopwatch"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="14"

        android:targetSdkVersion="18" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity 

            android:name=".StopWatch"

            android:label="StopWatch by XGW">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

				<category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".SecondActivity" 

            		android:label="Stopped">

        </activity>

    </application>

</manifest>




import com.example.stopwatch.R;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;



import java.util.*;





public class StopWatch extends Activity{

	final Calendar cal = Calendar.getInstance();

	int seconds;

	long startTime, t2;

	boolean started = false;

	int second;

	int minute;

	ArrayList<Integer> ListOfSecond = new ArrayList<Integer>();

	

	public String showTimeCount(long time) {

		String timeCount = "";

	    long hourc = time/3600000;

	    String hour = "0" + hourc;

	    hour = hour.substring(hour.length()-2, hour.length());

	        

	    long minuec = (time-hourc*3600000)/(60000);

	    String minue = "0" + minuec;

	    minue = minue.substring(minue.length()-2, minue.length());

	        

	    long secc = (time-hourc*3600000-minuec*60000)/1000;

	    String sec = "0" + secc;

	    sec = sec.substring(sec.length()-2, sec.length());

	    timeCount = hour + ":" + minue + ":" + sec;

	    return timeCount;

	}

	

	class Timer extends Thread{

		String temp;

		long startTime;

		Timer(long time){

			startTime = time;

		}

		public void run(){

			try{

				while(true){

					cal.setTime(new Date());

					long currentTime = cal.getTimeInMillis();

					temp = showTimeCount(currentTime - startTime);

					text.setText(temp);

					Thread.sleep(1000);

				}

			}

			catch(Exception e){

				e.printStackTrace();

			}

		}

	}

	 

	Button button1;

	Button button2;

	Button button3;

	TextView text;

	

	protected void onCreat(Bundle savedInstanceState){

		super.onCreate(savedInstanceState);

		setContentView(R.layout.first_layout);

		

		button1 = (Button) findViewById(R.id.button1);

		button2 = (Button) findViewById(R.id.button2);

		button3 = (Button) findViewById(R.id.button3);

		text = (TextView) findViewById(R.id.textView1);

		button1.setOnClickListener(new OnClickListener(){

			@Override

			public void onClick(View v) {

				if(started == false){

					cal.setTime(new Date());

					startTime = cal.getTimeInMillis();

					started = true;

					Timer timer = new Timer(startTime);

					timer.start();

					

				}

				else {

					Toast.makeText(getBaseContext(), "you have already started it!", Toast.LENGTH_LONG).show();

				}

			}		

		});

		Log.e("1","1");

		button2.setOnClickListener(new OnClickListener(){

			@Override

			public void onClick(View v) {

			// TODO Auto-generated method stub

			cal.setTime(new Date());

		    long t2= cal.getTimeInMillis();

		    seconds = (int) ((t2 - startTime) % 1000);

		    ListOfSecond.add(seconds);

		    Toast.makeText(getBaseContext(), "time recorded.", Toast.LENGTH_SHORT).show();

			}

		});

		

		button3.setOnClickListener(new OnClickListener(){

			@Override

			public void onClick(View v) {

				Toast.makeText(getBaseContext(), "stopped.", Toast.LENGTH_LONG).show();

				Bundle data = new Bundle();

				Intent intent = new Intent(StopWatch.this, SecondActivity.class);

				data.putIntegerArrayList("second",ListOfSecond);

				intent.putExtras(data);

				startActivity(intent);

				}

					

		});

		

		

	}

}





import java.util.ArrayList;

import java.util.Date;

import android.util.Log;

import com.example.stopwatch.R;



import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;



public class SecondActivity extends Activity{

	public String showTimeCount(long time) {

		

		String timeCount = "";

	    long hourc = time/3600;

	    String hour = "0" + hourc;

	    hour = hour.substring(hour.length()-2, hour.length());

	        

	    long minuec = (time-hourc*3600);

	    String minue = "0" + minuec;

	    minue = minue.substring(minue.length()-2, minue.length());

	        

	    long secc = (time-hourc*3600-minuec*60);

	    String sec = "0" + secc;

	    sec = sec.substring(sec.length()-2, sec.length());

	    timeCount = hour + ":" + minue + ":" + sec;

	    return timeCount;

	}

	

	TextView text;

	Button button1;

	

	protected void onCreate(Bundle saveInstanceState){

		super.onCreate(saveInstanceState);

		setContentView(R.layout.second_layout);

		text = (TextView) findViewById(R.id.textView1);

		button1 = (Button) findViewById(R.id.button1);

		Bundle bundle = this.getIntent().getExtras();   

		ArrayList<Integer> ListOfSecond  = bundle.getIntegerArrayList("second");

		String display = "";

		for (int i= 0; i < ListOfSecond.size(); ++ i){

			display += showTimeCount(ListOfSecond.get(i));

			display += '\n';

		}

		

		text.setText(display);

	

		button1.setOnClickListener(new OnClickListener(){

		@Override

		public void onClick(View v) {

			Intent intent = new Intent(SecondActivity.this, StopWatch.class);

			startActivity(intent);

		}		

		});

	}

}

这是两个活动。可能写的比较渣还请各位大神轻吐
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sinat_23870319 2015-09-09
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现在已经成功解决了这个error，可以启动程序了。原来是包文件路径的问题Orz。
但现在启动之后变成了这样，加载不出layout……
qq_25039477 2015-09-09
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报错的说的是你的方法没找到 你的页面注册了吗？
sinat_23870319 2015-09-09
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引用 3 楼 a1129963143 的回复:
[quote=引用 楼主 sinat_23870319 的回复:] 小弟刚刚才开始学java与安卓，这次老师布置的作业发现编译能通过，但是不能运行。logcat一看是这样的 好吧，当时我的内心是崩溃的 然后开始着手解决，但是发现那几个Exception都没办法独立解决。。无奈之下，只好来这里请教各位大神，还希望各位不吝赐教Orz 这是Manifest 
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.stopwatch"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity 
            android:name=".StopWatch"
            android:label="StopWatch by XGW">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity" 
            		android:label="Stopped">
        </activity>
    </application>
</manifest>

import com.example.stopwatch.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.*;


public class StopWatch extends Activity{
	final Calendar cal = Calendar.getInstance();
	int seconds;
	long startTime, t2;
	boolean started = false;
	int second;
	int minute;
	ArrayList<Integer> ListOfSecond = new ArrayList<Integer>();
	
	public String showTimeCount(long time) {
		String timeCount = "";
	    long hourc = time/3600000;
	    String hour = "0" + hourc;
	    hour = hour.substring(hour.length()-2, hour.length());
	        
	    long minuec = (time-hourc*3600000)/(60000);
	    String minue = "0" + minuec;
	    minue = minue.substring(minue.length()-2, minue.length());
	        
	    long secc = (time-hourc*3600000-minuec*60000)/1000;
	    String sec = "0" + secc;
	    sec = sec.substring(sec.length()-2, sec.length());
	    timeCount = hour + ":" + minue + ":" + sec;
	    return timeCount;
	}
	
	class Timer extends Thread{
		String temp;
		long startTime;
		Timer(long time){
			startTime = time;
		}
		public void run(){
			try{
				while(true){
					cal.setTime(new Date());
					long currentTime = cal.getTimeInMillis();
					temp = showTimeCount(currentTime - startTime);
					text.setText(temp);
					Thread.sleep(1000);
				}
			}
			catch(Exception e){
				e.printStackTrace();
			}
		}
	}
	 
	Button button1;
	Button button2;
	Button button3;
	TextView text;
	
	protected void onCreat(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.first_layout);
		
		button1 = (Button) findViewById(R.id.button1);
		button2 = (Button) findViewById(R.id.button2);
		button3 = (Button) findViewById(R.id.button3);
		text = (TextView) findViewById(R.id.textView1);
		button1.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				if(started == false){
					cal.setTime(new Date());
					startTime = cal.getTimeInMillis();
					started = true;
					Timer timer = new Timer(startTime);
					timer.start();
					
				}
				else {
					Toast.makeText(getBaseContext(), "you have already started it!", Toast.LENGTH_LONG).show();
				}
			}		
		});
		Log.e("1","1");
		button2.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
			// TODO Auto-generated method stub
			cal.setTime(new Date());
		    long t2= cal.getTimeInMillis();
		    seconds = (int) ((t2 - startTime) % 1000);
		    ListOfSecond.add(seconds);
		    Toast.makeText(getBaseContext(), "time recorded.", Toast.LENGTH_SHORT).show();
			}
		});
		
		button3.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				Toast.makeText(getBaseContext(), "stopped.", Toast.LENGTH_LONG).show();
				Bundle data = new Bundle();
				Intent intent = new Intent(StopWatch.this, SecondActivity.class);
				data.putIntegerArrayList("second",ListOfSecond);
				intent.putExtras(data);
				startActivity(intent);
				}
					
		});
		
		
	}
}


import java.util.ArrayList;
import java.util.Date;
import android.util.Log;
import com.example.stopwatch.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class SecondActivity extends Activity{
	public String showTimeCount(long time) {
		
		String timeCount = "";
	    long hourc = time/3600;
	    String hour = "0" + hourc;
	    hour = hour.substring(hour.length()-2, hour.length());
	        
	    long minuec = (time-hourc*3600);
	    String minue = "0" + minuec;
	    minue = minue.substring(minue.length()-2, minue.length());
	        
	    long secc = (time-hourc*3600-minuec*60);
	    String sec = "0" + secc;
	    sec = sec.substring(sec.length()-2, sec.length());
	    timeCount = hour + ":" + minue + ":" + sec;
	    return timeCount;
	}
	
	TextView text;
	Button button1;
	
	protected void onCreate(Bundle saveInstanceState){
		super.onCreate(saveInstanceState);
		setContentView(R.layout.second_layout);
		text = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		Bundle bundle = this.getIntent().getExtras();   
		ArrayList<Integer> ListOfSecond  = bundle.getIntegerArrayList("second");
		String display = "";
		for (int i= 0; i < ListOfSecond.size(); ++ i){
			display += showTimeCount(ListOfSecond.get(i));
			display += '\n';
		}
		
		text.setText(display);
	
		button1.setOnClickListener(new OnClickListener(){
		@Override
		public void onClick(View v) {
			Intent intent = new Intent(SecondActivity.this, StopWatch.class);
			startActivity(intent);
		}		
		});
	}
}
这是两个活动。可能写的比较渣还请各位大神轻吐
首先，作为新手还是要养成写注释的习惯啊[/quote]嗯嗯好的，小弟记住了T_T
sinat_23870319 2015-09-09
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引用 5 楼 hjywyj 的回复:
package 呢？

在这里额
sinat_23870319 2015-09-09
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用的是默认包额，只有一个包
骑着蜗牛去爬山 2015-09-09
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package 呢？
淡的微笑 2015-09-09
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异常信息不完整，还有，你没打断点调试一下吗
淡的微笑 2015-09-09
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引用 楼主 sinat_23870319 的回复:
小弟刚刚才开始学java与安卓，这次老师布置的作业发现编译能通过，但是不能运行。logcat一看是这样的 好吧，当时我的内心是崩溃的 然后开始着手解决，但是发现那几个Exception都没办法独立解决。。无奈之下，只好来这里请教各位大神，还希望各位不吝赐教Orz 这是Manifest 
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.stopwatch"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="14"
        android:targetSdkVersion="18" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity 
            android:name=".StopWatch"
            android:label="StopWatch by XGW">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
				<category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".SecondActivity" 
            		android:label="Stopped">
        </activity>
    </application>
</manifest>

import com.example.stopwatch.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.*;


public class StopWatch extends Activity{
	final Calendar cal = Calendar.getInstance();
	int seconds;
	long startTime, t2;
	boolean started = false;
	int second;
	int minute;
	ArrayList<Integer> ListOfSecond = new ArrayList<Integer>();
	
	public String showTimeCount(long time) {
		String timeCount = "";
	    long hourc = time/3600000;
	    String hour = "0" + hourc;
	    hour = hour.substring(hour.length()-2, hour.length());
	        
	    long minuec = (time-hourc*3600000)/(60000);
	    String minue = "0" + minuec;
	    minue = minue.substring(minue.length()-2, minue.length());
	        
	    long secc = (time-hourc*3600000-minuec*60000)/1000;
	    String sec = "0" + secc;
	    sec = sec.substring(sec.length()-2, sec.length());
	    timeCount = hour + ":" + minue + ":" + sec;
	    return timeCount;
	}
	
	class Timer extends Thread{
		String temp;
		long startTime;
		Timer(long time){
			startTime = time;
		}
		public void run(){
			try{
				while(true){
					cal.setTime(new Date());
					long currentTime = cal.getTimeInMillis();
					temp = showTimeCount(currentTime - startTime);
					text.setText(temp);
					Thread.sleep(1000);
				}
			}
			catch(Exception e){
				e.printStackTrace();
			}
		}
	}
	 
	Button button1;
	Button button2;
	Button button3;
	TextView text;
	
	protected void onCreat(Bundle savedInstanceState){
		super.onCreate(savedInstanceState);
		setContentView(R.layout.first_layout);
		
		button1 = (Button) findViewById(R.id.button1);
		button2 = (Button) findViewById(R.id.button2);
		button3 = (Button) findViewById(R.id.button3);
		text = (TextView) findViewById(R.id.textView1);
		button1.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				if(started == false){
					cal.setTime(new Date());
					startTime = cal.getTimeInMillis();
					started = true;
					Timer timer = new Timer(startTime);
					timer.start();
					
				}
				else {
					Toast.makeText(getBaseContext(), "you have already started it!", Toast.LENGTH_LONG).show();
				}
			}		
		});
		Log.e("1","1");
		button2.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
			// TODO Auto-generated method stub
			cal.setTime(new Date());
		    long t2= cal.getTimeInMillis();
		    seconds = (int) ((t2 - startTime) % 1000);
		    ListOfSecond.add(seconds);
		    Toast.makeText(getBaseContext(), "time recorded.", Toast.LENGTH_SHORT).show();
			}
		});
		
		button3.setOnClickListener(new OnClickListener(){
			@Override
			public void onClick(View v) {
				Toast.makeText(getBaseContext(), "stopped.", Toast.LENGTH_LONG).show();
				Bundle data = new Bundle();
				Intent intent = new Intent(StopWatch.this, SecondActivity.class);
				data.putIntegerArrayList("second",ListOfSecond);
				intent.putExtras(data);
				startActivity(intent);
				}
					
		});
		
		
	}
}


import java.util.ArrayList;
import java.util.Date;
import android.util.Log;
import com.example.stopwatch.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class SecondActivity extends Activity{
	public String showTimeCount(long time) {
		
		String timeCount = "";
	    long hourc = time/3600;
	    String hour = "0" + hourc;
	    hour = hour.substring(hour.length()-2, hour.length());
	        
	    long minuec = (time-hourc*3600);
	    String minue = "0" + minuec;
	    minue = minue.substring(minue.length()-2, minue.length());
	        
	    long secc = (time-hourc*3600-minuec*60);
	    String sec = "0" + secc;
	    sec = sec.substring(sec.length()-2, sec.length());
	    timeCount = hour + ":" + minue + ":" + sec;
	    return timeCount;
	}
	
	TextView text;
	Button button1;
	
	protected void onCreate(Bundle saveInstanceState){
		super.onCreate(saveInstanceState);
		setContentView(R.layout.second_layout);
		text = (TextView) findViewById(R.id.textView1);
		button1 = (Button) findViewById(R.id.button1);
		Bundle bundle = this.getIntent().getExtras();   
		ArrayList<Integer> ListOfSecond  = bundle.getIntegerArrayList("second");
		String display = "";
		for (int i= 0; i < ListOfSecond.size(); ++ i){
			display += showTimeCount(ListOfSecond.get(i));
			display += '\n';
		}
		
		text.setText(display);
	
		button1.setOnClickListener(new OnClickListener(){
		@Override
		public void onClick(View v) {
			Intent intent = new Intent(SecondActivity.this, StopWatch.class);
			startActivity(intent);
		}		
		});
	}
}
这是两个活动。可能写的比较渣还请各位大神轻吐
首先，作为新手还是要养成写注释的习惯啊
淡的微笑 2015-09-09
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没找到类异常，触发上级的运行时异常
sinat_23870319 2015-09-09
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啊对了，这个作业是要写一个秒表，也是我第一个安卓项目= = 烦请各路大神不吝赐教
ERROR:java.lang.RuntimeException: java.lang.ClassNotFoundException: Class cn.itcast.xx.xx not found
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运行mapreduce程序时出现异常java.lang.RuntimeException: java.lang.ClassNotFoundException的原因
运行mapreduce程序时出现异常java.lang.RuntimeException: java.lang.ClassNotFoundException的原因 hadoop分布式配置完毕后，我将主节点的下的hadoop-0.20.1直接导入eclipse，想直接在eclipse中书写程序并直接编译...
请问这个java.lang.RuntimeException，java.lang.ClassNotFoundException:异常原因是什么？
运行yarn任务失败Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class com.z.transformer.dimension.key.stats.StatsUserDimension not found 执行[hadoop@nn1 up]$ yarn jar ~/jar/...
Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class xxxx not found
出现“Error: java.lang.RuntimeException: java.lang.ClassNotFoundException: Class mapreduce.Mapper_one not found” 的原因是因为在打包成为jar包的时候出现错误造成的，即 找不到类,主程序中缺少配置 需要...
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver解决办法
用IDEA+maven+jfinal出现的问题：java.lang.ClassNotFoundException: com.mysql.jdbc.Driver今天早上，在配置基础的SSM框架时遇到这样的一个问题：java.lang.ClassNotFoundException: com.mysql.jdbc.Driver当时的第...
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