這是我MainActivity.java可以在非常基本的Android代碼解決錯誤
package com.calc.calculator;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
private EditText no1=(EditText) findViewById(R.id.editText1);
private EditText no2=(EditText) findViewById(R.id.editText2);
private EditText out=(EditText) findViewById(R.id.editText3);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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;
}
public void add(View view){
float output=Float.parseFloat(out.getText().toString());
float no1Value = Float.parseFloat(no1.getText().toString());
float no2Value = Float.parseFloat(no2.getText().toString());
float ans=Calc.Add(no1Value, no2Value);
output.setText(String.valueOf(Calc.Add(no1Value, no2Value)));
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
這是我Calc.java
package com.calc.calculator;
public class Calc {
public static float Add(float no1,float no2){
return(no1+no2);
}
}
我試圖做一個非常簡單的應用程序,計算總和的兩個號碼。但它表明在Mainactivity.java錯誤在這行35
output.setText(String.valueOf(Calc.Add(no1Value, no2Value)));
它說不能對原始數據類型float調用的setText(字符串)
我新的android開發,我很憋屈這是非常初學者的問題。 請幫助:d
輸出被定義爲** float **('floa t output = Float.parseFloat(out.getText()。toString());')。您無法將**字符串**傳遞給它。它沒有'setText()'方法。 – 2014-12-13 18:45:36
請檢查這個答案:[這裏](http://stackoverflow.com/questions/26533870/error-cannot-invoke-string-on-the-primitive-type-float-on-quadratic-formul) – 2014-12-13 18:50:25
這是一個錯字既不是'java'也不是'android'錯誤。更好地檢查你的代碼,而不是回答問題。你應該寫出'out.setText(String.valueOf(Calc.Add(no1Value,no2Value)));' – madlymad 2014-12-13 18:56:43