AndroidRuntime：致命异常：main java.lang.RuntimeException：无法在运行期间在logcat中启动活动ComponentInfo

-2

当我在模拟器中运行时，应用程序崩溃说“不幸的应用程序已停止”。并显示错误AndroidRuntime：FATAL EXCEPTION：main java.lang.RuntimeException：无法在我的logcat中启动活动ComponentInfo。请帮我解决这个错误，因为我是java和android的新手。 MainActivity.javaAndroidRuntime：致命异常：main java.lang.RuntimeException：无法在运行期间在logcat中启动活动ComponentInfo

package com.example.kiran.lamolamo; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TextView; 

public class MainActivity extends Activity { 

    EditText Input; 
    TextView Text; 

    MyDBHandler dbHandler; 


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

Input = (EditText)findViewById(R.id.buckysInput); 
     Text = (TextView) findViewById(R.id.buckysText); 
dbHandler= new MyDBHandler(this, null, null, 1); 
     printDatabase(); 
    } 

    public void addButtonClicked(View view){ 
     Products product = new Products(Input.getText().toString()); 
     dbHandler.addproduct(product); 
     printDatabase(); 


    } 
public void deleteButtonClicked(View view) { 
    String inputText = Input.getText().toString(); 
    dbHandler.deleteproduct(inputText); 
    printDatabase(); 
} 
    public void printDatabase() { 

     String dbString = dbHandler.databaseToString(); 
     Text.setText(dbString); 
     Input.setText(""); 

    } 
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.kiran.lamolamo.MainActivity"> 

    <EditText 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:inputType="textPersonName" 
     android:text="Name" 
     android:ems="10" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="20dp" 
     android:id="@+id/buckysInput" /> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 

     android:id="@+id/addUser" 
     android:onClick="addButtonClicked" 
     android:text="Add User" 
     android:layout_marginLeft="21dp" 
     android:layout_marginStart="21dp" 
     android:layout_marginTop="40dp" 
     android:layout_below="@+id/buckysInput" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     /> 

    <Button 
     android:text="Button" 
     android:onClick="deleteButtonClicked" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignBottom="@+id/addUser" 
     android:layout_alignRight="@+id/buckysInput" 
     android:layout_alignEnd="@+id/buckysInput" 
     android:id="@+id/button" /> 

    <TextView 
     android:text="TextView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/button" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="152dp" 
     android:id="@+id/buckysText" 
     android:textAppearance="@style/TextAppearance.AppCompat.Display2" /> 

</RelativeLayout>

Products.java

package com.example.kiran.lamolamo; 
public class Products { 
private int _id; 
    private String _productname; 
public Products(){}; 
    public Products(String productname) { 
     this.set_productname(productname); 
    } 
    public int get_id() { 
     return _id; 
    } 
    public void set_id(int _id) { 
     this._id = _id; 
    } 

    public String get_productname() { 
     return _productname; 
    } 

    public void set_productname(String _productname) { 
     this._productname = _productname; 
    } 
}

MyDBHandler.java

包com.example.kiran.lamolamo;

import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

public class MyDBHandler extends SQLiteOpenHelper{ 

private static final int DATABASE_VESION = 1; 
    private static final String DATABASE_NAME = "products.db"; 
    public static final String TABLE_NAME = "products"; 
    public static final String COLUMN_ID="_id"; 
    public static final String COLUMN_PRODUCTNAME = "productname"; 




    public MyDBHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) { 
     super(context, DATABASE_NAME, factory, DATABASE_VESION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
    String Query = "CREATE TABLE" + TABLE_NAME + "(" + 
      COLUMN_ID + "INTEGER PRIMARY KEY AUTOINCREMENT" + 
      COLUMN_PRODUCTNAME + "TEXT" + 
     ");"; 
     db.execSQL(Query); 
    } 
    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME); 
     onCreate(db); 
    } 

public void addproduct(Products product) { 
    ContentValues values = new ContentValues(); 
    values.put(COLUMN_PRODUCTNAME,product.get_productname()); 
    SQLiteDatabase db = getWritableDatabase(); 
    db.insert(TABLE_NAME,null,values); 
    db.close(); 
} 

    public void deleteproduct(String productName) { 
     SQLiteDatabase db = getWritableDatabase(); 
     db.execSQL("DELETE FROM" + TABLE_NAME + "WHERE"+COLUMN_PRODUCTNAME + "=\"" + productName + "\";"); 

    } 

public String databaseToString() { 
String dbString = ""; 
    SQLiteDatabase db = getWritableDatabase(); 
    String Query = "SELECT * FROM " + TABLE_NAME + "WHERE 1"; 
    Cursor c = db.rawQuery(Query,null); 
    c.moveToFirst(); 
    while(!c.isAfterLast()){ 
    if (c.getString(c.getColumnIndex("productname"))!=null) { 
    dbString += c.getString(c.getColumnIndex("productname")); 
     dbString+="\n"; 
    } 
    } 
    db.close(); 
    return dbString; 
} 
}

logcat的

11-11 18:53:20.979 30992-30992/? D/dalvikvm: Late-enabling CheckJNI 
11-11 18:53:21.063 30992-30992/com.example.kiran.lamolamo I/dalvikvm: Could not find method android.app.Application.registerOnProvideAssistDataListener, referenced from method com.android.tools.fd.runtime.BootstrapApplication.registerOnProvideAssistDataListener 
11-11 18:53:21.067 30992-30992/com.example.kiran.lamolamo W/dalvikvm: VFY: unable to resolve virtual method 242: Landroid/app/Application;.registerOnProvideAssistDataListener (Landroid/app/Application$OnProvideAssistDataListener;)V 
11-11 18:53:21.067 30992-30992/com.example.kiran.lamolamo D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002 
11-11 18:53:21.143 30992-30992/com.example.kiran.lamolamo I/dalvikvm: Could not find method android.app.Application.unregisterOnProvideAssistDataListener, referenced from method com.android.tools.fd.runtime.BootstrapApplication.unregisterOnProvideAssistDataListener 
11-11 18:53:21.143 30992-30992/com.example.kiran.lamolamo W/dalvikvm: VFY: unable to resolve virtual method 245: Landroid/app/Application;.unregisterOnProvideAssistDataListener (Landroid/app/Application$OnProvideAssistDataListener;)V 
11-11 18:53:21.143 30992-30992/com.example.kiran.lamolamo D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002 
11-11 18:53:21.143 30992-30992/com.example.kiran.lamolamo I/InstantRun: Instant Run Runtime started. Android package is com.example.kiran.lamolamo, real application class is null. 
11-11 18:53:21.175 30992-30992/com.example.kiran.lamolamo W/InstantRun: No instant run dex files added to classpath 
11-11 18:53:21.179 30992-30992/com.example.kiran.lamolamo E/dalvikvm: Could not find class 'android.util.ArrayMap', referenced from method com.android.tools.fd.runtime.MonkeyPatcher.monkeyPatchExistingResources 
11-11 18:53:21.183 30992-30992/com.example.kiran.lamolamo W/dalvikvm: VFY: unable to resolve check-cast 1704 (Landroid/util/ArrayMap;) in Lcom/android/tools/fd/runtime/MonkeyPatcher; 
11-11 18:53:21.183 30992-30992/com.example.kiran.lamolamo D/dalvikvm: VFY: replacing opcode 0x1f at 0x025e 
11-11 18:53:21.183 30992-30992/com.example.kiran.lamolamo E/dalvikvm: Could not find class 'android.util.ArrayMap', referenced from method com.android.tools.fd.runtime.MonkeyPatcher.pruneResourceCache 
11-11 18:53:21.183 30992-30992/com.example.kiran.lamolamo W/dalvikvm: VFY: unable to resolve const-class 1704 (Landroid/util/ArrayMap;) in Lcom/android/tools/fd/runtime/MonkeyPatcher; 
11-11 18:53:21.183 30992-30992/com.example.kiran.lamolamo D/dalvikvm: VFY: replacing opcode 0x1c at 0x0060 
11-11 18:53:21.295 30992-30992/com.example.kiran.lamolamo E/SQLiteLog: (1) near "TABLEproducts": syntax error 
11-11 18:53:21.295 30992-30992/com.example.kiran.lamolamo D/AndroidRuntime: Shutting down VM 
11-11 18:53:21.303 30992-30992/com.example.kiran.lamolamo W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0xa62c4288) 
11-11 18:53:21.303 30992-30992/com.example.kiran.lamolamo E/AndroidRuntime: FATAL EXCEPTION: main 
                      java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.kiran.lamolamo/com.example.kiran.lamolamo.MainActivity}: android.database.sqlite.SQLiteException: near "TABLEproducts": syntax error (code 1): , while compiling: CREATE TABLEproducts(_idINTEGER PRIMARY KEY AUTOINCREMENTproductnameTEXT); 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 
                       at android.app.ActivityThread.access$600(ActivityThread.java:130) 
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 
                       at android.os.Handler.dispatchMessage(Handler.java:99) 
                       at android.os.Looper.loop(Looper.java:137) 
                       at android.app.ActivityThread.main(ActivityThread.java:4745) 
                       at java.lang.reflect.Method.invokeNative(Native Method) 
                       at java.lang.reflect.Method.invoke(Method.java:511) 
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
                       at dalvik.system.NativeStart.main(Native Method) 
                      Caused by: android.database.sqlite.SQLiteException: near "TABLEproducts": syntax error (code 1): , while compiling: CREATE TABLEproducts(_idINTEGER PRIMARY KEY AUTOINCREMENTproductnameTEXT); 
                       at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) 
                       at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882) 
                       at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:493) 
                       at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) 
                       at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58) 
                       at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31) 
                       at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1663) 
                       at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1594) 
                       at com.example.kiran.lamolamo.MyDBHandler.onCreate(MyDBHandler.java:31) 
                       at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:252) 
                       at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:164) 
                       at com.example.kiran.lamolamo.MyDBHandler.databaseToString(MyDBHandler.java:55) 
                       at com.example.kiran.lamolamo.MainActivity.printDatabase(MainActivity.java:42) 
                       at com.example.kiran.lamolamo.MainActivity.onCreate(MainActivity.java:25) 
                       at android.app.Activity.performCreate(Activity.java:5008) 
                       at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 
                       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 
                       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)  
                       at android.app.ActivityThread.access$600(ActivityThread.java:130)  
                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)  
                       at android.os.Handler.dispatchMessage(Handler.java:99)  
                       at android.os.Looper.loop(Looper.java:137)  
                       at android.app.ActivityThread.main(ActivityThread.java:4745)  
                       at java.lang.reflect.Method.invokeNative(Native Method)  
                       at java.lang.reflect.Method.invoke(Method.java:511)  
                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)  
                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)  
                       at dalvik.system.NativeStart.main(Native Method)

来源

2016-11-11 Kiran

你真正的问题

产生的原因：android.database.sqlite.SQLiteException：近 “TABLEproducts”：语法错误（代码1）：在编译： CREATE TABLEproducts（_idINTEGER PRIMARY KEY AUTOINCREMENTproductnameTEXT）;

原因

String Query = "CREATE TABLE" + TABLE_NAME + "(" + 
     COLUMN_ID + "INTEGER PRIMARY KEY AUTOINCREMENT" + 
     COLUMN_PRODUCTNAME + "TEXT" + 
    ");";

解决方案

String Query = "CREATE TABLE " + TABLE_NAME + "(" + 
          ^add a space 

     COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
        ^add a space      ^^ add a comma, and space 

     COLUMN_PRODUCTNAME + " TEXT" + 
          ^add a space 
    ");";

我喜欢它们执行我查询之前调试日志。

if (debugQuery) { Log.d("MyDBHelper", "Executing query [ " + query + " ]"); } db.execSQL(Query);

好像你在调用onUpgrade时也会有同样的问题。

db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);

再次，缺少空间

db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); ^here
您的查询
又一次......

String Query = "SELECT * FROM " + TABLE_NAME + "WHERE 1";

应该

String Query = "SELECT * FROM " + TABLE_NAME + " WHERE 1"; ^here

来源

2016-11-11 19:17:03

谢谢马特·克拉克的回答。我已经根据你编辑了我的代码，它确实帮助我运行代码。该应用程序运行，但当我单击底部时停止。我的代码有错吗？请帮忙。 – Kiran

飞机坠毁的原因是输入错误，在你的MyDBHandler.java你忘了5位和1个逗号。

它必须是

public class MyDBHandler extends SQLiteOpenHelper{ 
... 
@Override 
public void onCreate(SQLiteDatabase db) { 
String Query = "CREATE TABLE " + TABLE_NAME + " (" + 
     COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
     COLUMN_PRODUCTNAME + " TEXT" + 
    ");"; 
    db.execSQL(Query); 
} 
...

来源

2016-11-11 19:15:27

AndroidRuntime：致命异常：main java.lang.RuntimeException：无法在运行期间在logcat中启动活动ComponentInfo

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