Question

尝试创建BMI计算器我已经为重量和高度声明了一个变量，但我仍然得到“变量”重量的错误“可能尚未初始化。

public class MainActivity extends AppCompatActivity {

private EditText eheight, eweight;
private Button computeb;
private TextView output, category;

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

    eheight = (EditText) findViewById(R.id.eheight);
    eweight = (EditText) findViewById(R.id.eweight);
    output = (TextView) findViewById(R.id.output);
    category = (TextView) findViewById(R.id.category);
    computeb = (Button) findViewById(R.id.computeb);

    computeb.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {

            float weight, height, BMI;

            if (checkInputLength())
                return;
            weight = Float.parseFloat(weight.getText().toString());
            height = Float.parseFloat(height.getText().toString());
            computeBMI(weight, height);

            BMI = weight / (height * height);
        }
    });
}

Answer 1

weight.getText（）？ weight是一个浮点类型值，此处未初始化。我想你想用eweight。和身高一样。

            weight = Float.parseFloat(eweight.getText().toString());
            height = Float.parseFloat(eheight.getText().toString());

Answer 2

更改

weight = Float.parseFloat(weight.getText().toString());
height = Float.parseFloat(height.getText().toString());

到

weight = Float.parseFloat(eweight.getText().toString());
height = Float.parseFloat(eheight.getText().toString());

权重和高度只是浮点变量。如果要解析来自edittext的数据，则必须从edittexts获取数据并将它们存储在相应的变量中。

Answer 3

将其设置为0。

float weight = 0;

Answer 4

改变这个：

weight = Float.parseFloat(weight.getText().toString());

为：

weight = Float.parseFloat(eweight.getText().toString());

Android - 变量可能尚未初始化

4 个答案: