当点击一个按钮时，应用程序被强制关闭

Question

我正面临onclick按钮的问题。我检查了以前提出的问题，但无法弄清楚问题所在，究竟在哪里。第一次，当我点击'下一步'按钮时，它成功移动到下一页，但在第二页中，输入详细信息后，点击'继续'按钮时，应用程序崩溃。

活动1：

package com.application.P1; 

//import com.application.P1.R; 
//import android.R; 
import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 


public class P1Activity extends Activity implements View.OnClickListener{ 
     /** Called when the activity is first created. */ 



    // @Override 
     public void onCreate(Bundle savedInstanceState) { 


      super.onCreate(savedInstanceState); 

      //Using TextView to Give a Home Page Screen 
      TextView tv=new TextView(this); 
      tv.setText("WELCOME TO Application Click on Next to Proceed"); 



      setContentView(R.layout.main); 
     } 





     public void Welcome(View v){ 

      // Toast.makeText(this, "Please enter your Nickname and proceed further", Toast.LENGTH_SHORT).show();   


      Intent myActivity = new Intent(this,Activity2.class); 
      startActivity(myActivity); 

      // EditText t 



     } 
     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 


     } 



    } 

活性2：

package com.application.P1; 


import android.app.Activity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 

public class Activity2 extends Activity implements View.OnClickListener{ 
     /** Called when the activity is first created. */ 
     // @Override 
     public void onCreate(Bundle savedInstanceState) { 


      super.onCreate(savedInstanceState); 



      setContentView(R.layout.login); 
     } 



     public void Proceed4(View v){ 

    //  Toast.makeText(this, "Thanks for entering your nickname", Toast.LENGTH_SHORT).show(); 

      Intent myActivity2 = new Intent(this,Activity3.class); 
      startActivity(myActivity2); 



      // EditText t 



     } 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

     } 



    } 

Activity3：

package com.application.P1; 

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


public class Activity3 extends Activity implements View.OnClickListener{ 
     /** Called when the activity is first created. */ 


    // @Override 
     public void onCreate(Bundle savedInstanceState) { 

      super.onCreate(savedInstanceState); 



      setContentView(R.layout.check); 
     } 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 


     } 







    } 

所有三项活动都在同一个包。在第二项活动中，点击按钮后，当消息被烘烤时，烘烤的消息就会正常显示。但是，当下一个活动被调用时，它不会到来。

XML Coding: 

main.xml中：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" 
    android:background="@drawable/backrepeat" 
    > 


    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="@string/hello" /> 

    <Button 
     android:text="@string/Next" 
     android:id="@+id/Button01" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"   
     android:onClick="Welcome"/> 





</LinearLayout> 

login.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" 
    > 



    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="@string/mynickname" /> 



<EditText 
      android:id="@+id/mynickname3" 
      android:singleLine="true" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
    /> 

    <Button 
     android:text="@string/Proceed" 
     android:id="@+id/Button02" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"   
     android:onClick="Proceed4"/> 


</LinearLayout> 

Check.xml：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <TextView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:text="@string/hello3" /> 
</LinearLayout> 

的AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.application.P1" 
    android:versionCode="1" 
    android:versionName="1.0" > 

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

    <application 
     android:icon="@drawable/cherry" 
     android:label="@string/app_name" > 
     <activity 
      android:name=".P1Activity" 
      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=".Activity2"> 


     </activity> 

     <activity android:name=".Activity3"></activity> 

     </application> 

</manifest> 

03-22 00：50：27.125：E/AndroidRuntime（857）：在java.lang.reflect.Method.invokeNative（本机方法） 03-22 00：50：27.125：E/AndroidRuntime（857 ）：在java.lang.reflect.Method.invoke（Method.java:507） 03-22 00：50：27.125：E/AndroidRuntime（857）：at android.view.View $ 1.onClick（View.java： 2139） 03-22 00：50：27.125：E/AndroidRuntime（857）：... 11更多 03-22 00：50：27.125：E/AndroidRuntime（857）：引起：android.content.ActivityNotFoundException：无法找到明确的活动

class {com.application.P1/com.application.P1.Activity3}; have you declared this activity in your AndroidManifest.xml? 
03-22 00:50:27.125: E/AndroidRuntime(857): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1405) 
03-22 00:50:27.125: E/AndroidRuntime(857): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379) 
03-22 00:50:27.125: E/AndroidRuntime(857): at android.app.Activity.startActivityForResult(Activity.java:2827) 
03-22 00:50:27.125: E/AndroidRuntime(857): at android.app.Activity.startActivity(Activity.java:2933) 
03-22 00:50:27.125: E/AndroidRuntime(857): at com.application.P1.Activity2.Proceed4(Activity2.java:31) 
03-22 00:50:27.125: E/AndroidRuntime(857): ... 14 more 
03-22 00:50:29.867: I/Process(857): Sending signal. PID: 857 SIG: 9 

Values.xml：

从这个代码 此

// @Override 
     public void onCreate(Bundle savedInstanceState) { 


      super.onCreate(savedInstanceState); 

      //Using TextView to Give a Home Page Screen 
      TextView tv=new TextView(this); 
      tv.setText("WELCOME TO Application Click on Next to Proceed"); 



      setContentView(R.layout.main); 
     } 

：在活动A

<string name="hello">Welcome to Expresso Application</string> 
     <string name="Next">Next</string> 
     <string name="app_name">Expresso2</string> 
     <string name="Proceed">Proceed</string> 
     <string name="Nickname">Nickname</string> 
     <string name="mynickname">myNickname</string> 

     <string name="hello3">Tensions</string> 

Answer 1

基于堆栈跟踪，看来你的玛尼fest文件不会声明该活动。检查Activity3是否有<activity>标签。

Answer 2

拳头取代

@Override 
     public void onCreate(Bundle savedInstanceState) { 

      super.onCreate(savedInstanceState); 
setContentView(R.layout.main); 
      //Using TextView to Give a Home Page Screen 
      TextView tv=new TextView(this); 
      tv.setText("WELCOME TO Application Click on Next to Proceed"); 

     }