Why does my app crash without any errors?
Internet of Things
IoT Frameworks
2 years ago
1
Rating
_x000D_
_x000D_
App crashes and I am getting these errors:
FATAL EXCEPTION: main
Process: com.example.ayyan.jellybeanestimator, PID: 2960
java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.example.ayyan.jellybeanestimator/com.example.ayyan.jellybeanestimator.MainActivity}:
java.lang.NumberFormatException: empty String
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
Caused by: java.lang.NumberFormatException: empty String
at
java.lang.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1071)
at java.lang.Double.parseDouble(Double.java:547)
at
com.example.ayyan.jellybeanestimator.MainActivity.onCreate(MainActivity.java:25)
at android.app.Activity.performCreate(Activity.java:6662)
at
android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2599)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2707)Â
at android.app.ActivityThread.-wrap12(ActivityThread.java)Â
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:1460)Â
at android.os.Handler.dispatchMessage(Handler.java:102)Â
at android.os.Looper.loop(Looper.java:154)Â
at android.app.ActivityThread.main(ActivityThread.java:6077)Â
at java.lang.reflect.Method.invoke(Native Method)Â
at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)Â
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
package com.example.ayyan.jellybeanestimator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.EditText;
import android.widget.Button;
import android.content.Intent;
import android.view.View;
public class MainActivity extends AppCompatActivity {
EditText jellyBeanLength, jellyBeanDiameter, jarSizeVolume;
double jellybeantall, jellybeanfat, jellybeanspace;
double loadFactor = .698;
TextView answer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
jellyBeanLength = (EditText) findViewById (R.id.length);
jellyBeanDiameter = (EditText) findViewById (R.id.diameter);
jarSizeVolume = (EditText) findViewById (R.id.jarsize);
jellybeantall = Double.parseDouble(jellyBeanLength.getText().toString());
jellybeanfat = Double.parseDouble(jellyBeanDiameter.getText().toString());
jellybeanspace = Double.parseDouble(jarSizeVolume.getText().toString());
answer = (TextView) findViewById (R.id.answer);
Button calculate = (Button) findViewById (R.id.calculate);
calculate.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, MainActivity.class));
}
});
double volumeOfOneJellyBean = ((3.14159265359/6)*(jellybeanfat*jellybeanfat)*jellybeantall);
double volumeofBeans = (jellybeanspace*loadFactor);
float numberOfBeans = (float)Math.round (volumeofBeans/volumeOfOneJellyBean);
answer.setText("You have this amount of beans in your jar" + numberOfBeans);
}
}
Posted on 16 Aug 2022, this text provides information on IoT Frameworks related to Internet of Things. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
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Best Answer
2 years ago
_x000D_ you should calculate onClick of button.In your code you are not entering any value and trying to calculate it. @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); jellyBeanLength = (EditText) findViewById (R.id.length); jellyBeanDiameter = (EditText) findViewById (R.id.diameter); jarSizeVolume = (EditText) findViewById (R.id.jarsize); jellybeantall = Double.parseDouble(jellyBeanLength.getText().toString()); jellybeanfat = Double.parseDouble(jellyBeanDiameter.getText().toString()); jellybeanspace = Double.parseDouble(jarSizeVolume.getText().toString()); answer = (TextView) findViewById (R.id.answer); Button calculate = (Button) findViewById (R.id.calculate); calculate.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { double volumeOfOneJellyBean = ((3.14159265359/6)*(jellybeanfat*jellybeanfat)*jellybeantall); double volumeofBeans = (jellybeanspace*loadFactor); float numberOfBeans = (float)Math.round (volumeofBeans/volumeOfOneJellyBean); answer.setText("You have this amount of beans in your jar" + numberOfBeans); } }); }