Question

我正面临一个按钮onclick的问题。我检查了之前提出的问题，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，单击“继续”按钮时，应用程序崩溃。

活性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


        }







    }

所有这三项活动都在同一个包中。在第二个活动中，按钮点击后，当一个消息被烘烤时，烤好的消息正好进入。但是，当调用下一个活动时，它就不会到来。

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）：at java.lang.reflect.Method.invokeNative（Native Method） 03-22 00：50：27.125：E / AndroidRuntime（857）：at java.lang.reflect.Method.invoke（Method.java:507） 03-22 00：50：27.125：E / AndroidRuntime（857）：在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：无法找到显式活动

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：

<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

根据堆栈跟踪，您的清单文件似乎不会声明活动。检查<activity>是否有Activity3标记。

Answer 2

在活动A中替换：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);
        }

来自此代码：

@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");

        }

单击按钮时，应用程序将强制关闭

2 个答案: