创建数据库和插入表的简单应用程序在模拟器上工作但在设备上停止

Question

我在这里有一个简单的应用程序，可以在模拟器上完美运行。但是显示应用程序在移动设备或标签页上运行时已停止。

我的主动就是这样。

public class MainActivity extends Activity {

    EditText animalName;
    DBController controller = new DBController(this);

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        animalName = (EditText) findViewById(R.id.editText1);

        final ListView lv=(ListView)findViewById(R.id.listView1);
        final TextView tv=(TextView)findViewById(R.id.textView1);

        final ArrayList<String> your_array_list = new ArrayList<String>();
        final ArrayAdapter<String> arrayAdapter;

        Button b2=(Button)findViewById(R.id.button2);
        b2.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                tv.setText(controller.getInfo());   

            }

        });

        Button b1=(Button)findViewById(R.id.button1);
        b1.setOnClickListener(new OnClickListener(){

            @Override
            public void onClick(View view) {
                // TODO Auto-generated method stub
                String name=animalName.getText().toString();
                controller.createEntry(name);
                this.callHomeActivity(view);

            }

            private void callHomeActivity(View view) {
                // TODO Auto-generated method stub
                Intent objIntent = new Intent(getApplicationContext(), MainActivity.class);
                startActivity(objIntent);
            }

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

}

和DBController.java

package com.example.dbapp;

import java.util.ArrayList;
import java.util.HashMap;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Toast;

public class DBController  extends SQLiteOpenHelper {
      private static final String LOGCAT = null;

      private static String DB_TABLE = "Animals";

      private static String KEY_ROW = "animalId";

      private static String KEY_NAME = "animalName";



      public DBController(Context applicationcontext) {
        super(applicationcontext, "androidsqlite.db", null, 1);
        Log.d(LOGCAT,"Created");
      }

      @Override
      public void onCreate(SQLiteDatabase database) {
        String query;
        //query = "CREATE TABLE" +DB_TABLE+"(" +KEY_ROW+" INTEGER PRIMARY KEY AUTOINCREMENT, " +KEY_NAME+ " TEXT NOT NULL);"
        database.execSQL("CREATE TABLE" +DB_TABLE+"(" +KEY_ROW+" INTEGER PRIMARY KEY AUTOINCREMENT, " +KEY_NAME+ " TEXT NOT NULL);");
        Log.d(LOGCAT,"animals Created");
      }
      @Override
      public void onUpgrade(SQLiteDatabase database, int version_old, int current_version) {
        String query;
        query = "DROP TABLE IF EXISTS animals";
        database.execSQL(query);
        onCreate(database);
      }

      public String getInfo()
      {
          SQLiteDatabase myDataBase = this.getReadableDatabase();
        String s = null;
        Cursor c=myDataBase.rawQuery("SELECT * FROM animals",null);
        if(c.moveToFirst())
        {
            s=c.getString(c.getColumnIndex("animalName"));
        }
        return s;
      } 

      public void createEntry(String name)
      {
          String s= "Insert success";
          SQLiteDatabase database = this.getWritableDatabase();
          ContentValues cv = new ContentValues();
          cv.put(KEY_NAME, name);
          database.insert("DB_TABLE",null,cv);
          database.close();
      }   
}

应用必须从editText中获取值，并应插入到表中。点击显示时，它应显示第一行元素。