点击操作栏菜单按钮导致应用程序停止

我完全是全新的android开发。我目前正试图做一个笔记应用程序。操作栏将有2个按钮，创建和设置，引导用户创建和设置页面。创建按钮工作得很好，但我不知道为什么每当我运行应用程序，然后单击设置按钮它不会导致我到设置页面，应用程序突然停止。点击操作栏菜单按钮导致应用程序停止

这里是我的代码

MainActivity.java

包com.example.sunny.mynote;

import android.app.ActionBar; 
import android.app.ListActivity; 
import android.content.Intent; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.view.ContextMenu; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Adapter; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

import com.example.sunny.mynote.com.example.sunny.mynote.data.NoteDataSource; 
import com.example.sunny.mynote.com.example.sunny.mynote.data.NoteItem; 

import java.util.List; 


public class MainActivity extends ListActivity { 

    public static final int EDITOR_ACRIVITY_REQUEST = 1001; 
    public static final int SETTINGS_REQUEST = 1003; 
    private static final int MENU_DELETE_ID = 1002; 
    private int currentNoteId; 
    private NoteDataSource datasource; 
    List<NoteItem> notesList; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     registerForContextMenu(getListView()); 

     datasource = new NoteDataSource(this); 

     refreshDisplay(); 
    } 

    private void refreshDisplay() { 
     notesList = datasource.findAll(); 
     ArrayAdapter<NoteItem> adapter = 
       new ArrayAdapter<NoteItem>(this, R.layout.list_item_layout, notesList); 
     setListAdapter(adapter); 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    public boolean onOptionsItemSelected(MenuItem item) { 
     if (item.getItemId() == R.id.action_create) 
     { 
      createNote(); 
     } 
     int id = item.getItemId(); 
     if (id == R.id.action_create) { 
      return true; 
     } 

     if (item.getItemId() == R.id.action_settings) 
     { 
      Intent intent2 = new Intent(MainActivity.this, Settings.class); 
      startActivity(intent2); 
     } 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    private void createNote() 
    { 
     NoteItem note = NoteItem.getNew(); 
     Intent intent = new Intent(this, NoteEditorActivity.class); 
     intent.putExtra("key", note.getKey()); 
     intent.putExtra("text", note.getText()); 
     startActivityForResult(intent, EDITOR_ACRIVITY_REQUEST); 
    } 

    private void Settings() 
    { 

    } 


    @Override 
    protected void onListItemClick(ListView l, View v, int position, long id) { 
     NoteItem note = notesList.get(position); 
     Intent intent = new Intent(this, NoteEditorActivity.class); 
     intent.putExtra("key", note.getKey()); 
     intent.putExtra("text", note.getText()); 
     startActivityForResult(intent, EDITOR_ACRIVITY_REQUEST); 
    } 

    @Override 
    protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
     if (requestCode == EDITOR_ACRIVITY_REQUEST && resultCode == RESULT_OK) 
     { 
      overridePendingTransition(R.anim.fadein, R.anim.fadeout); 
      NoteItem note = new NoteItem(); 
      note.setKey(data.getStringExtra("key")); 
      note.setText(data.getStringExtra("text")); 
      datasource.update(note); 
      refreshDisplay(); 
     } 
    } 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { 

     AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; 
     currentNoteId = (int)info.id; 
     menu.add(0, MENU_DELETE_ID, 0, "Delete"); 
    } 

    @Override 
    public boolean onContextItemSelected(MenuItem item) { 

     if (item.getItemId() == MENU_DELETE_ID) 
     { 
      NoteItem note = notesList.get(currentNoteId); 
      datasource.remove(note); 
      refreshDisplay(); 
     } 

     return super.onContextItemSelected(item); 
    } 
}

Settings.java

package com.example.sunny.mynote; 

import android.app.Activity; 
import android.content.Intent; 
import android.graphics.Color; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.widget.Button; 
import android.widget.RadioButton; 
import android.widget.RadioGroup; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.widget.EditText; 

/** 
* Created by Sunny on 19/04/2015. 
*/ 
public class Settings extends Activity { 

    View view = LayoutInflater.from(getApplication()).inflate(R.layout.activity_note_editor, null); 

    private RadioGroup RadioGroup1; 
    private RadioButton rdbRed, rdbBlue, rdbOrange; 
    private Button btnSave; 
    private TextView textView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.settings); 
     View view = LayoutInflater.from(getApplication()).inflate(R.layout.settings, null); 

     RadioGroup1 = (RadioGroup) findViewById(R.id.RadioGroup1); 

     RadioGroup1.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(RadioGroup group, int checkedId) { 
       if(checkedId == R.id.rdbRed) 
       { 
        Toast.makeText(getApplicationContext(), "choice: Red", 
          Toast.LENGTH_SHORT).show(); 
       } 
       else if(checkedId == R.id.rdbBlue) 
       { 
        Toast.makeText(getApplicationContext(), "choice: Blue", 
          Toast.LENGTH_SHORT).show(); 
       } 
       else 
       { 
        Toast.makeText(getApplicationContext(), "choice: Orange", 
          Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 

     Intent intent = new Intent(this, NoteEditorActivity.class); 

     rdbRed = (RadioButton) findViewById(R.id.rdbRed); 
     rdbBlue = (RadioButton) findViewById(R.id.rdbBlue); 
     rdbOrange = (RadioButton) findViewById(R.id.rdbOrange); 
     textView = (TextView) findViewById(R.id.noteText); 

     btnSave = (Button)findViewById(R.id.btn_Save); 
     btnSave.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       int selectedId = RadioGroup1.getCheckedRadioButtonId(); 
       if(selectedId == rdbRed.getId()) { 
        textView.setTextColor(Color.parseColor("#FF0000")); 
       } else if(selectedId == rdbBlue.getId()) { 
        textView.setTextColor(Color.parseColor("#0066FF")); 
       } else { 
        textView.setTextColor(Color.parseColor("#FF6600")); 
       } 
       finish(); 
      } 

     }); 
    } 

    @Override 
    public void onBackPressed() { 
     finish(); 
    } 
}

日志

04-21 22:02:11.583 26636-26636/com.example.sunny.mynote I/SELinux﹕ Function: selinux_android_load_priority [0], There is no sepolicy file. 
04-21 22:02:11.603 26636-26636/com.example.sunny.mynote I/SELinux﹕ Function: selinux_android_load_priority , spota verifySig and checkHash pass. priority version is VE=SEPF_SM-N9005_4.4.2_0040 
04-21 22:02:11.603 26636-26636/com.example.sunny.mynote I/SELinux﹕ selinux_android_seapp_context_reload: seapp_contexts file is loaded from /data/security/spota/seapp_contexts 
04-21 22:02:11.603 26636-26636/com.example.sunny.mynote E/dalvikvm﹕ >>>>> Normal User 
04-21 22:02:11.603 26636-26636/com.example.sunny.mynote E/dalvikvm﹕ >>>>> com.example.sunny.mynote [ userId:0 | appId:10383 ] 
04-21 22:02:11.603 26636-26636/com.example.sunny.mynote D/dalvikvm﹕ Late-enabling CheckJNI 
04-21 22:02:11.613 26636-26636/com.example.sunny.mynote I/dalvikvm﹕ Enabling JNI app bug workarounds for target SDK version 7... 
04-21 22:02:11.693 26636-26636/com.example.sunny.mynote W/ApplicationPackageManager﹕ getCSCPackageItemText() 
04-21 22:02:11.693 26636-26636/com.example.sunny.mynote I/PersonaManager﹕ getPersonaService() name persona_policy 
04-21 22:02:11.723 26636-26636/com.example.sunny.mynote E/MoreInfoHPW_ViewGroup﹕ Parent view is not a TextView 
04-21 22:02:11.743 26636-26636/com.example.sunny.mynote D/AbsListView﹕ Get MotionRecognitionManager 
04-21 22:02:11.763 26636-26636/com.example.sunny.mynote D/AbsListView﹕ onVisibilityChanged() is called, visibility : 4 
04-21 22:02:11.763 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:11.763 26636-26636/com.example.sunny.mynote D/AbsListView﹕ onVisibilityChanged() is called, visibility : 0 
04-21 22:02:11.763 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:11.773 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:11.793 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:11.793 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:11.823 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:12.868 26636-26636/com.example.sunny.mynote D/AbsListView﹕ Get MotionRecognitionManager 
04-21 22:02:12.898 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:12.948 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:12.948 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:12.998 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:12.998 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:13.758 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:13.758 26636-26636/com.example.sunny.mynote D/AbsListView﹕ onDetachedFromWindow 
04-21 22:02:13.758 26636-26636/com.example.sunny.mynote D/AbsListView﹕ unregisterIRListener() is called 
04-21 22:02:13.758 26636-26636/com.example.sunny.mynote D/AndroidRuntime﹕ Shutting down VM 
04-21 22:02:13.758 26636-26636/com.example.sunny.mynote W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0x417e0da0) 
04-21 22:02:13.768 26636-26636/com.example.sunny.mynote E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.example.sunny.mynote, PID: 26636 
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.sunny.mynote/com.example.sunny.mynote.Settings}: java.lang.NullPointerException 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2218) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2350) 
      at android.app.ActivityThread.access$800(ActivityThread.java:163) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1257) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:157) 
      at android.app.ActivityThread.main(ActivityThread.java:5335) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.NullPointerException 
      at android.view.LayoutInflater.from(LayoutInflater.java:212) 
      at com.example.sunny.mynote.Settings.<init>(Settings.java:21) 
      at java.lang.Class.newInstanceImpl(Native Method) 
      at java.lang.Class.newInstance(Class.java:1208) 
      at android.app.Instrumentation.newActivity(Instrumentation.java:1079) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2209) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2350) 
            at android.app.ActivityThread.access$800(ActivityThread.java:163) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1257) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:157) 
            at android.app.ActivityThread.main(ActivityThread.java:5335) 
            at java.lang.reflect.Method.invokeNative(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:515) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1265) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1081) 
            at dalvik.system.NativeStart.main(Native Method) 
04-21 22:02:15.248 26636-26636/com.example.sunny.mynote I/Process﹕ Sending signal. PID: 26636 S

IG：9

来源

2015-04-21 Lulu Harper

请张贴崩溃日志 – nvinayshetty

是否显示任何错误？ logcat的？ – Harry

需要logcat跟踪来显示您的错误。 [见此链接]（http://stackoverflow.com/questions/4839539/android-effecient-way-to-read-logcat-output）。 – Vijay

你有夸大视图内或改变的OnCreate（）呼叫在Settings.java所以将你的行View view = LayoutInflater.from(getApplication()).inflate(R.layout.activity_note_editor, null);里面的OnCreate（）

来源

2015-04-21 11:33:03

我试过这个，但应用程序仍然崩溃当我按设置按钮 –

任何更改logcat或仍然是相同的？也更新代码和logcat在你的问题 –

设置和logcat更新 –

尝试改变该行中设置：

private View view; 

protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.settings); 
    view = LayoutInflater.from(getApplication()).inflate(R.layout.activity_note_editor, null); 
}

来源

2015-04-21 11:29:20 Vijay

现在整个应用程序完全崩溃 –

再次看到你的logcat。 – Vijay

小解释。成员变量在构造函数调用之前被初始化。在构造函数之前调用'LayoutInflater.from（getApplication（））'，并且'getApplication（）'返回null。 'getApplication（）'方法只在活动被“附加”之后才返回应用程序对象。所以你应该在'onCreate（）'中做。 –

点击操作栏菜单按钮导致应用程序停止

回答

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