该应用程序突然关闭,只要登录按钮,pressed [英] The app closes abruptly as soon as Login Button is pressed

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问题描述

我是一个新手,Android和我构建了一个小app.But应用说,当我preSS登录按钮它没有响应,请帮我解决这个错误倒闭

清单code

 <?XML版本=1.0编码=UTF-8&GT?;
  <清单的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
   包=com.example.firstapp
   安卓版code =1
   机器人:=的versionName1.0>   <用途-SDK
    安卓的minSdkVersion =8
    机器人:targetSdkVersion =17/>   <应用
    机器人:allowBackup =真
    机器人:图标=@绘制/ ic_launcher
    机器人:标签=@字符串/ APP_NAME
    机器人:主题=@风格/ Theme.Base.AppCompat.Light.DarkActionBar>
    <活动
        机器人:名字=。MainActivity
        机器人:标签=@字符串/ title_activity_main>
        &所述;意图滤光器>
            <作用机器人:名字=android.intent.action.MAIN/>            <类机器人:名字=android.intent.category.LAUNCHER/>
        &所述; /意图滤光器>
    < /活性GT;
    <活动
        机器人:二NAME =
        机器人:标签=@字符串/ title_activity_second>
    < /活性GT;
    <活动
        机器人:注册NAME =
        机器人:标签=@字符串/ title_activity_registration>
    < /活性GT;
  < /用途>< /清单>

MainActivity_java

 包com.example.firstapp;进口com.example.firstapp.R;
进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.widget.Button;公共类MainActivity延伸活动{   @覆盖
   保护无效的onCreate(捆绑savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.activity_main);
    最后Button按钮=(按钮)findViewById(R.id.button_id);
    button.setOnClickListener(新View.OnClickListener(){
        公共无效的onClick(视图v){
            意图I =新意图(MainActivity.this,Second.class);
            startActivity(ⅰ);
        }
    });
最后的按钮按钮2 =(按钮)findViewById(R.id.button2_id);
button2.setOnClickListener(新View.OnClickListener(){
    公共无效的onClick(视图v){
        意向J =新意图(MainActivity.this,Registration.class);
        startActivity(J);
    }
});
}
 }

Second.java

 包com.example.firstapp;  进口android.os.Bundle;
  进口android.support.v7.app.ActionBarActivity;
  进口android.view.View;
  进口android.widget.AdapterView;
 进口android.widget.AdapterView.OnItemSelectedListener;
 进口android.widget.ArrayAdapter;
 进口android.widget.Spinner;
进口android.widget.Toast;
 公共类二扩展ActionBarActivity实现OnItemSelectedListener {@覆盖
保护无效的onCreate(捆绑savedInstanceState){
    super.onCreate(savedInstanceState);
    的setContentView(R.layout.activity_main);
    微调微调=(微调)findViewById(R.id.spinner1);
    spinner.setOnItemSelectedListener(本);
 //使用字符串数组和默认微调布局的ArrayAdapter
 ArrayAdapter<&CharSequence的GT;适配器= ArrayAdapter.createFromResource(这一点,
         R.array.food_array,android.R.layout.simple_spinner_item);
 //指定布局使用出现的选项列表时,
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 //应用适配器微调
 spinner.setAdapter(适配器);
}
@覆盖
公共无效onItemSelected(适配器视图<>母公司,观景,INT位置,长的id){
  字符串项= parent.getItemAtPosition(位置)的ToString();    //显示选择微调项目
    Toast.makeText(parent.getContext(),选择:+项目,Toast.LENGTH_LONG).show();}
@覆盖
公共无效onNothingSelected(适配器视图<>母公司){
    // code
}
 }


解决方案

MainActivity_java

 包com.example.firstapp;
        进口android.view.View.OnClickListener;
        进口android.app.Activity;
        进口android.content.Intent;
        进口android.os.Bundle;
        进口android.view.Menu;
        进口android.view.MenuItem;
        进口android.view.View;
        进口android.widget.Button;        公共类MainActivity延伸活动{
    Button按钮,按钮2;           @覆盖
           保护无效的onCreate(捆绑savedInstanceState){
            super.onCreate(savedInstanceState);
            的setContentView(R.layout.activity_main);
            按钮=(按钮)findViewById(R.id.button_id);
             按钮2 =(按钮)findViewById(R.id.button2_id);
     setButtonOnClickListeners();
        }
       私人无效setButtonOnClickListeners(){
      button.setOnClickListener(新OnClickListener(){
          公共无效的onClick(视图v){
              意图I =新意图(MainActivity.this,Second.class);
              startActivity(ⅰ);
          }
      });  button2.setOnClickListener(新OnClickListener(){
      公共无效的onClick(视图v){
          意向J =新意图(MainActivity.this,Registration.class);
          startActivity(J);
      }
  });
  }
   }

I'm a newbie to android and I constructed a small app.But the app closes down by saying its not responding when I press the login button,please help me out in solving this error

Manifest Code

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

   <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

   <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.Base.AppCompat.Light.DarkActionBar" >


    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Second"
        android:label="@string/title_activity_second" >
    </activity>
    <activity
        android:name=".Registration"
        android:label="@string/title_activity_registration" >
    </activity>
  </application>

</manifest>

MainActivity_java

  package com.example.firstapp;

import com.example.firstapp.R;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {

   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Button button = (Button) findViewById(R.id.button_id);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            Intent i = new Intent(MainActivity.this,Second.class);
            startActivity(i);
        }
    });
final Button button2=(Button) findViewById(R.id.button2_id);
button2.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        Intent j = new Intent(MainActivity.this,Registration.class);
        startActivity(j);
    }
});
}


 }

Second.java

  package com.example.firstapp;

  import android.os.Bundle;
  import android.support.v7.app.ActionBarActivity;
  import android.view.View;
  import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemSelectedListener;
 import android.widget.ArrayAdapter;
 import android.widget.Spinner;
import android.widget.Toast;


 public class Second extends ActionBarActivity implements OnItemSelectedListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Spinner spinner = (Spinner) findViewById(R.id.spinner1);
    spinner.setOnItemSelectedListener(this);
 // Create an ArrayAdapter using the string array and a default spinner layout
 ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this,
         R.array.food_array, android.R.layout.simple_spinner_item);
 // Specify the layout to use when the list of choices appears
 adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
 // Apply the adapter to the spinner
 spinner.setAdapter(adapter);


}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,long id) {
  String item = parent.getItemAtPosition(position).toString();

    // Showing selected spinner item
    Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

}
@Override
public void onNothingSelected (AdapterView<?> parent) {
    // code
}
 }

解决方案

MainActivity_java

      package com.example.firstapp;
        import android.view.View.OnClickListener;
        import android.app.Activity;
        import android.content.Intent;
        import android.os.Bundle;
        import android.view.Menu;
        import android.view.MenuItem;
        import android.view.View;
        import android.widget.Button;

        public class MainActivity extends Activity {
    Button button, button2 ;

           @Override
           protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            button  = (Button) findViewById(R.id.button_id);
             button2  = (Button) findViewById(R.id.button2_id);


     setButtonOnClickListeners();
        }
       private void setButtonOnClickListeners(){
      button.setOnClickListener(new OnClickListener(){
          public void onClick(View v) {
              Intent i = new Intent(MainActivity.this,Second.class);
              startActivity(i);
          }
      });

  button2.setOnClickListener(new OnClickListener(){
      public void onClick(View v) {
          Intent j = new Intent(MainActivity.this,Registration.class);
          startActivity(j);
      }
  });
  }
   }

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