尝试创建另一个布局时出错

Question

我的项目有些问题。当我通过虚拟设备运行我的项目时，AS发布了一个错误（如下图所示）： Image here

这个问题的解决方案是什么（我想当我尝试创建第二个布局代码时会发生这种情况））

public class MainActivity extends Activity implements OnClickListener {
EditText bmisat;
TextView txtstat;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
     btnView =(Button) findViewById(R.id.ButtonView);
    btnView.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent scr=new Intent(MainActivity.this,Main2Activity.class);
            startActivity(scr);
        }
    });

    Button CalculateBMI_Btn = (Button) findViewById(R.id.CalculateBMI);
    CalculateBMI_Btn.setOnClickListener(this);

}


@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;
}


@Override
public void onClick(View v) {
    try{
    EditText edtWeight = (EditText) findViewById(R.id.WeightInputEdt);
    EditText edtHeight = (EditText) findViewById(R.id.HeightInputEdt);

         txtstat=(TextView) findViewById(R.id.release_bmi);


        String sWeigth = edtWeight.getText().toString();
    String sHeigth = edtHeight.getText().toString();

    float fWeight = Float.valueOf(sWeigth);
    float fHeight = Float.valueOf(sHeigth);

    final float fBMI = fWeight / (fHeight*fHeight);

    EditText edtBMIEdt = (EditText) findViewById(R.id.BMIEdt);
         bmisat=(EditText) findViewById(R.id.bmi_bar);
    edtBMIEdt.setText(String.valueOf(fBMI));
    Getstat(fBMI,0f,15f,"Thiếu cân rất nặng");
    Getstat(fBMI,15f,16f,"Thiếu cân nặng");
    Getstat(fBMI,16f,18.5f,"Thiếu cân");
    Getstat(fBMI,18.5f,25f,"Bình thường");
    Getstat(fBMI,25f,30f,"Tiền beó phì");
    Getstat(fBMI,30f,35f,"Beó phì độ I");
    Getstat(fBMI,35f,40f,"Béo phì độ II");
    Getstat(fBMI,40f,1000f,"Beó phì độ III");

        DB=this.openOrCreateDatabase(DB_NAME,MODE_PRIVATE,null);
        DB.execSQL("CREATE TABLE IF NOT EXISTS "+TABLE_NAME+"(BMI_num REAL);");

        ContentValues ct=new ContentValues();
        ct.put("BMI_num",fBMI);
        DB.insert(TABLE_NAME,null,ct);
    //  DB.delete(TABLE_NAME,null,null);

        Cursor c=DB.rawQuery("SELECT BMI_num FROM "+TABLE_NAME,null)    ;
        if (c.moveToFirst()){
            do {
                float code=c.getFloat(c.getColumnIndex("BMI_num"));
                Toast.makeText(MainActivity.this,code+"",Toast.LENGTH_LONG).show();
            } while (c.moveToNext());
        }
    }catch(Exception e ){
      Toast.makeText(v.getContext(), "Error during calculating BMI"+e.toString(), 1000);
    }

}



    private    void Getstat(float intial,float a,float b,String str)
{

    if ((intial>=a) && (intial<b))
    {

            bmisat.setText(str);

    }
}

} 我在项目中添加了以下2个代码

  

私人决赛String TABLE_NAME =＆＃34; BMI_TABLE＆＃34 ;;   private final String DB_NAME =＆＃34; Database＆＃34 ;;   SQLiteDatabase DB = null;