My app crashes when my phone language is set to Persian or Arabic due to Double.parseDouble… here is a solution to the problem.
My app crashes when my phone language is set to Persian or Arabic due to Double.parseDouble
Below is the java code for one of my activities, it works fine when the language of the phone is
English, but it crashes when the language of the phone is set to Persian or Arabic. logcat says there is a problem with Double.parseDouble. It seems that when the user enters the numbers, it changes them to Persian or Arabic numbers, which is why it crashes. Is there any solution?
java code:
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.math.BigDecimal;
import java.text.DecimalFormat;
public class stressesoninclinedsections extends AppCompatActivity {
private EditText input1;
private EditText input2;
private EditText input3;
private TextView sh_resultt;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stressesoninclinedsections);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
input1 = (EditText) findViewById(R.id.editText);
input2 = (EditText) findViewById(R.id.editText2);
input3 = (EditText) findViewById(R.id.editText3);
Button bt_calculate1 = (Button) findViewById(R.id.button4);
sh_resultt = (TextView) findViewById(R.id.textView8);
bt_calculate1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
makeCalculationss();
}
});
}
private void makeCalculationss() {
if ( input1.getText().toString().trim().equals("") || input1.getText().toString().trim().equals("-") || input1.getText().toString().trim().equals(".") || input1.getText().toString().trim().equals("-.")
|| input2.getText().toString().trim().equals("") || input2.getText().toString().trim().equals(".")
|| input3.getText().toString().trim().equals("") || input3.getText().toString().trim().equals("-") || input3.getText().toString().trim().equals(".") || input3.getText().toString().trim().equals("-.")) {
sh_resultt.setText("");
Snackbar.make(findViewById(android. R.id.content), "لطفا مقادیر تمامی متغیرها را وارد کنید ", Snackbar.LENGTH_LONG)
.show();
}
else {
Double n1 = Double.valueOf(input1.getText().toString());
Double n2 = Double.valueOf(input2.getText().toString());
Double n3 = Double.valueOf(input3.getText().toString());
Double n3pi2 = n3+90;
Double n3pi2rad = (n3pi2*Math.PI)/180;
Double n3radians = (n3*Math.PI)/180;
Double result1 = ((n1 / n2) *Math.cos(n3radians)*Math.cos(n3radians))/1000;
Double result2 = ((n1 / n2) *Math.cos(n3pi2rad)*Math.cos(n3pi2rad))/1000;
Double result3 = -((n1 / n2) *Math.sin(n3radians)*Math.cos(n3radians))/1000;
result1 =Double.parseDouble(new DecimalFormat("##.######").format(result1));
result2 =Double.parseDouble(new DecimalFormat("##.######").format(result2));
result3 =Double.parseDouble(new DecimalFormat("##.######").format(result3));
sh_resultt.setText( "σx' (MPa)=\n" + result1 + "\n" + "\nσy' (MPa)=\n" + result2 + "\n" + "\nTx'y' (MPa)=\n" + result3 );
}
}
@Override
public void onBackPressed() {
Intent intent = new Intent(stressesoninclinedsections.this, solidmechanics.class);
startActivity(intent);
finish();
}
}
This is Logcat:
03-08 19:16:32.457 3035-3035/com.wima.civilengineeringcalculator E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NumberFormatException: Invalid long: "٠٫٠١١٧٥٢"
at java.lang.Long.invalidLong(Long.java:125)
at java.lang.Long.parse(Long.java:362)
at java.lang.Long.parseLong(Long.java:353)
at java.lang.Long.parseLong(Long.java:319)
at java.math.BigDecimal.<init>(BigDecimal.java:350)
at java.math.BigDecimal.<init>(BigDecimal.java:438)
at com.wima.civilengineeringcalculator.stressesoninclinedsections.makeCalculationss(stressesoninclinedsections.java:65)
at com.wima.civilengineeringcalculator.stressesoninclinedsections.access$000(stressesoninclinedsections.java:16)
at com.wima.civilengineeringcalculator.stressesoninclinedsections$1.onClick(stressesoninclinedsections.java:42)
at android.view.View.performClick(View.java:3549)
at android.view.View$PerformClick.run(View.java:14393)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:4945)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
03-08 19:16:32.467 1595-2005/? E/EmbeddedLogger: App crashed! Process: com.wima.civilengineeringcalculator
03-08 19:16:32.467 1595-2005/? E/EmbeddedLogger: App crashed! Package: com.wima.civilengineeringcalculator v1 (1.0)
Solution
You need to convert numbers from string to double locale using a Latin locale such as English-United States:
Try parsing it like this:
try {
Double d=(Double)NumberFormat.getInstance(new Locale("en","US")).parse("123");
} catch (ParseException e) {
e.printStackTrace();
}