Android-如何计算一个编辑文本并除以另一个值?
我是一个完全的初学者,我想知道是否有人可以帮助我的代码。我正在尝试制作理想的日常饮水应用程序 将只有一个编辑文本供用户输入他们的重量,我希望它除以例如0.024。有按钮计算,然后在屏幕上显示答案Android-如何计算一个编辑文本并除以另一个值?,android,android-edittext,Android,Android Edittext,我是一个完全的初学者,我想知道是否有人可以帮助我的代码。我正在尝试制作理想的日常饮水应用程序 将只有一个编辑文本供用户输入他们的重量,我希望它除以例如0.024。有按钮计算,然后在屏幕上显示答案 public class WaterCalculate extends Activity { //Declare textviews as fields, so they can be accessed throughout the activity. EditText weightu
public class WaterCalculate extends Activity {
//Declare textviews as fields, so they can be accessed throughout the activity.
EditText weightuser;
TextView tv4;
ImageButton calculate;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.water_calculate);
//Bind the EditText views
weightuser = (EditText)findViewById(R.id.weight);
tv4 = (TextView)findViewById(R.id.res);
calculate = (ImageButton)findViewById(R.id.calc);
calculate.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
calculate();
}
});
}
private void calculate() {
//get entered texts from the edittexts,and convert to integers.
Double value1 = Double.parseDouble(weightuser.getText().toString());
//do the calculation
Double calculatedValue = (value1/0.024);
//set the value to the textview, to display on screen.
tv4.setText(String.valueOf("You need " + calculatedValue + "\nliters of water per day" ));
}
}
当我运行应用程序时,按下按钮计算其不工作,并显示应用程序已停止。感谢您的帮助。请尝试下面的代码,我相信它会起作用,当您使用“单击侦听器”按钮时,您应该使用“查看”。Onclick
class WaterCalculate extends Activity {
// Declare textviews as fields, so they can be accessed throughout the
// activity.
EditText weightuser;
TextView tv4;
ImageButton calculate;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.water_calculate);
// Bind the EditText views
weightuser = (EditText) findViewById(R.id.weight);
tv4 = (TextView) findViewById(R.id.res);
calculate = (ImageButton) findViewById(R.id.calc);
calculate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
calculate();
}
});
}
private void calculate() {
// get entered texts from the edittexts,and convert to integers.
Double value1 = Double.parseDouble(weightuser.getText().toString());
// do the calculation
Double calculatedValue = (value1 / 0.024);
// set the value to the textview, to display on screen.
tv4.setText(String.valueOf("You need " + calculatedValue
+ "\nliters of water per day"));
}
}
我以为问题出在这方面
tv4.setText(String.valueOf("You need " + calculatedValue + "\nliters of water per day" ));
像这样试一试
tv4.setText("You need "+Double.toString(calculatedValue)+"\nliters of water per day");
同时还要确保在必要的位置捕捉到异常,例如将editText值转换为double。我已经尝试过,但当我单击按钮时,应用程序仍然停止。谢谢你的回答@MadhuSorry,但我没有点击它。但是你的回答很有用。再次感谢你@MadhuI已经将其更改为字符串,但仍然无法工作。也许代码很好,但我不知道错误在哪里。顺便说一句,谢谢@Vishwa@Ell首先确保父布局中有可用的视图ID。然后在try-and-catch中尝试整个代码。您将获得异常类型。基于异常将帮助您找到解决方案。