java - token "boolean"出现语法错误，表达式无效

Question

-我在 if/else 部分或下面的代码中遇到“标记“boolean ”的语法错误，无效的表达式”错误。我在所有“else/if”行上收到此错误 3 次。

-我遇到的另一个错误是在最后一个“else”上我必须插入一个“;”在没有解决任何问题的声明之后。

package com.dey2929.bmihealth;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;

public class ResultActivity extends Activity {
TextView result;
TextView review;
    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_result);
    result = (TextView) findViewById(R.id.tvmybmi);
    review = (TextView) findViewById(R.id.review);
     Intent intent = getIntent();
     String YourBmi = intent.getStringExtra("YourBmi");
     result.setText(" Your BMI is: " + YourBmi);
      if (boolean.valueof(YourBmi) <= 18.0)
      {
          review.setText("You are Underweight ");

      }
      else if ((boolean.valueof(YourBmi) > 18.0 && boolean.valueof(YourBmi) < 25.0 ))
      {
          review.setText("You are Normal (healthy weight) ");
      }
      else ((boolean.valueof(YourBmi)) > 25.0)
      {
          review.setText("You are Overweight");
      }


}


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

}

更新:

编辑-仅在最后一行中留下错误，即

• The left-hand side of an assignment must be a variable -Syntax error, insert ";" to complete Statement
  • Insert assignment operator expression to complete assignment.

修改后的代码:

package com.dey2929.bmihealth;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TextView;

public class ResultActivity extends Activity {
TextView result;
TextView review;
    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_result);
    result = (TextView) findViewById(R.id.tvmybmi);
    review = (TextView) findViewById(R.id.review);
     Intent intent = getIntent();
     String YourBmi = intent.getStringExtra("YourBmi");
     result.setText(" Your BMI is: " + YourBmi);
      if (Float.parseFloat(YourBmi) <= 18.0)
      {
          review.setText("You are Underweight ");

      }
      else if ((Float.parseFloat(YourBmi) > 18.0 && Float.parseFloat(YourBmi) < 25.0 ))
      {
          review.setText("You are Normal (healthy weight) ");
      }
      else (Float.parseFloat(YourBmi) > 25.0)
      {
          review.setText("You are Overweight");
      }


}


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

}

Answer 1

以下内容无效

  if (boolean.valueof(YourBmi) <= 18.0)

更改为

  if (Float.parseFloat(YourBmi) <= 18.0)

我假设YourBmi将包含String形式的 float