安卓应用开发我的app闪退怎么回事啊，闪到界面都出不来啊！大神们救救孩子吧
！！！！！！！！！！！！
public class MainActivity extends AppCompatActivity {
private EditText mEditText;
private TextView mTextView;
private Button mButton;
private ImageView mImageView;
private View backgroundColor;
private double rate =39.37;
private int [] colors = {Color.BLACK,Color.BLUE,Color.RED,Color.GRAY,Color.GREEN,Color.WHITE};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mEditText=(EditText) findViewById(R.id.meterEditText);
mTextView=(TextView) findViewById(R.id.resultTextView);
mImageView=(ImageView) findViewById(R.id.changeColorImageView);
backgroundColor=findViewById(R.id.backgroundColor);
mButton=(Button) findViewById(R.id.converBtn);

mButton.setOnClickListener((v)->{
double meters=0.0;
double result =0.0;