如何在我的Java代碼中插入DecimalFormat。我想我的價值(resultat)像這樣###,###,###。00。 (Resultat)in result.setText(「rent is」+ String.valueOf(resultat)+「currency」);我正在嘗試幾個DecimalFormat,但沒有效果,因爲可能我沒有正確插入字符串中的decimalFormat。謝謝你給我看。如何在我的Java代碼中插入DecimalFormat
package albencreation.realestateapplication;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class Rent extends AppCompatActivity {
EditText price = null;
EditText profit = null;
TextView result = null;
Button envoyer = null;
Button close = null;
Button info = null;
Button clear = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.rent);
price = (EditText) findViewById(R.id.price);
profit = (EditText) findViewById(R.id.profit);
result = (TextView) findViewById(R.id.result);
envoyer = (Button) findViewById(R.id.buttcalculate);
close = (Button) findViewById(R.id.buttclose);
info = (Button) findViewById(R.id.buttinfo);
clear = (Button) findViewById(R.id.buttclear);
envoyer.setOnClickListener(envoyerListener);
close.setOnClickListener(closeListener);
info.setOnClickListener(infoListener);
clear.setOnClickListener(clearListener);
}
private OnClickListener envoyerListener = new OnClickListener() {
@Override
public void onClick(View v) {
String p = price.getText().toString();
String o = profit.getText().toString();
float pValue;
if (p.isEmpty()) {
pValue = 0;
} else {
pValue = Float.valueOf(p);
}
float oValue;
if (o.isEmpty()) {
oValue = 0;
} else {
oValue = Float.valueOf(o);
}
float resultat = oValue * pValue/100;
result.setText("the rent is " + String.valueOf(resultat) + " currency");
}
};
private OnClickListener closeListener = new OnClickListener() {
@Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, MainActivity.class);
startActivity(jumpage);
Rent.this.finish();
}
};
private OnClickListener infoListener = new OnClickListener() {
@Override
public void onClick(View v) {
Intent jumpage = new Intent(Rent.this, Inforent.class);
startActivity(jumpage);
}
};
private OnClickListener clearListener = new OnClickListener() {
@Override
public void onClick(View v) {
price.getText().clear();
profit.getText().clear();
String defaut = "result rent";
result.setText(defaut);
}
};
}
很好,你包括你的代碼,但'DecimalFormat'不會出現在你發佈的代碼中的任何地方。請參閱幫助中心的[問](https://stackoverflow.com/help/mcve)。 –