Application has stopped working in android
Question
This is my fourthpage class in my application. I am getting the error
unfortunately application has stopped working
I have no idea why am I getting this.
package student.a.a;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.text.DecimalFormat;
public class fourthpage extends Activity {
EditText txtb1, txtb2, txtb3, txtb4, txtb5;
Button btnper;
TextView lblgrade, lblper;
DecimalFormat df = new DecimalFormat("##.##");
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fourthxml);
// text boxes
txtb1 = (EditText) findViewById(R.id.txtb1);
txtb2 = (EditText) findViewById(R.id.txtb2);
txtb3 = (EditText) findViewById(R.id.txtb3);
txtb4 = (EditText) findViewById(R.id.txtb4);
txtb5 = (EditText) findViewById(R.id.txtb5);
// buttons
btnper = (Button) findViewById(R.id.btnper);
// labels/text view
lblgrade = (TextView) findViewById(R.id.lblgrade);
lblper = (TextView) findViewById(R.id.lblgrade);
}
String tb1 = txtb1.getText().toString();
String tb2 = txtb2.getText().toString();
String tb3 = txtb3.getText().toString();
String tb4 = txtb4.getText().toString();
String tb5 = txtb5.getText().toString();
double txb1 = Double.parseDouble(tb1);
double txb2 = Double.parseDouble(tb2);
double txb3 = Double.parseDouble(tb3);
double txb4 = Double.parseDouble(tb4);
double txb5 = Double.parseDouble(tb5);
double sum = 0;
double total = 0;
public void onClickper(View v) {
sum = txb1 + txb2 + txb3 + txb4 + txb5;
total = (sum / 500) * 100;
String tot = df.format(total);
lblper.setText(tot);
if (total <= 100) {
lblgrade.setText("Congratulations !! , Grade 'A+' ");
} else if (total <= 80) {
lblgrade.setText("Congratulations !! , Grade 'A'");
} else if (total <= 70) {
lblgrade.setText("Grade 'B'");
} else if (total <= 60) {
lblgrade.setText("Grade 'C'");
} else
lblgrade.setText("Failed");
}
}
This is the xml code of fourthpage . It contains 5 text boxes, a button and two textviews:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TableLayout
android:id="@+id/tableLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<TableRow
android:id="@+id/tableRow1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView1"
android:layout_gravity="left"
android:text="Calculate your marks"
android:textAppearance="?android:attr/textAppearanceMedium" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow7"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Space android:layout_gravity="fill_horizontal" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout2"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView2"
android:layout_gravity="left"
android:text="Subject 1"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/txtb1"
android:layout_width="162dp"
android:layout_gravity="fill_horizontal" >
<requestFocus />
</EditText>
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow3"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/GridLayout01"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/TextView01"
android:layout_gravity="left"
android:text="Subject 2"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/txtb2"
android:layout_gravity="fill_horizontal" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/GridLayout02"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/TextView02"
android:layout_gravity="left"
android:text="Subject 3"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/txtb3"
android:layout_gravity="fill_horizontal" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow5"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/GridLayout03"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/TextView03"
android:layout_gravity="left"
android:text="Subject 4"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/txtb4"
android:layout_gravity="fill_horizontal" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow6"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/GridLayout04"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/TextView04"
android:layout_gravity="left"
android:text="Subject 5"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="@+id/txtb5"
android:layout_gravity="fill_horizontal" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow8"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout4"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<Button
android:id="@+id/btnper"
android:layout_gravity="left"
android:text="Button" android:onClick="onClickper"/>
<Button
android:id="@+id/btngrade"
android:layout_gravity="left"
android:text="Button" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow9"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout5"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView3"
android:layout_gravity="left"
android:text="percentage is "
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/lblper"
android:layout_gravity="left"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</GridLayout>
</TableRow>
<TableRow
android:id="@+id/tableRow10"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<GridLayout
android:id="@+id/gridLayout6"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/textView5"
android:layout_gravity="left"
android:text=" Grade is "
android:textAppearance="?android:attr/textAppearanceSmall" />
<TextView
android:id="@+id/lblgrade"
android:layout_gravity="left"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge" />
</GridLayout>
</TableRow>
</TableLayout>
</LinearLayout>
Here is androidmanifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="student.a.a"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="14" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:label="@string/app_name"
android:name=".StudentsinfoActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:label="@string/app_name"
android:name=".secondpage" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:label="@string/app_name"
android:name=".thirdpage" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:label="@string/app_name"
android:name=".fourthpage" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Here is my logcat:
08-09 16:32:00.970: W/dalvikvm(892): threadid=1: thread exiting with uncaught exception (group=0x409961f8)
08-09 16:32:00.980: E/AndroidRuntime(892): FATAL EXCEPTION: main
08-09 16:32:00.980: E/AndroidRuntime(892): java.lang.RuntimeException: Unable to start activity ComponentInfo{student.a.a/student.a.a.fourthpage}: java.lang.NumberFormatException: Invalid double: ""
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.os.Looper.loop(Looper.java:137)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-09 16:32:00.980: E/AndroidRuntime(892): at java.lang.reflect.Method.invokeNative(Native Method)
08-09 16:32:00.980: E/AndroidRuntime(892): at java.lang.reflect.Method.invoke(Method.java:511)
08-09 16:32:00.980: E/AndroidRuntime(892): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-09 16:32:00.980: E/AndroidRuntime(892): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-09 16:32:00.980: E/AndroidRuntime(892): at dalvik.system.NativeStart.main(Native Method)
08-09 16:32:00.980: E/AndroidRuntime(892): Caused by: java.lang.NumberFormatException: Invalid double: ""
08-09 16:32:00.980: E/AndroidRuntime(892): at java.lang.StringToReal.invalidReal(StringToReal.java:63)
08-09 16:32:00.980: E/AndroidRuntime(892): at java.lang.StringToReal.parseDouble(StringToReal.java:248)
08-09 16:32:00.980: E/AndroidRuntime(892): at java.lang.Double.parseDouble(Double.java:295)
08-09 16:32:00.980: E/AndroidRuntime(892): at student.a.a.fourthpage.onCreate(fourthpage.java:61)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.Activity.performCreate(Activity.java:4465)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-09 16:32:00.980: E/AndroidRuntime(892): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
08-09 16:32:00.980: E/AndroidRuntime(892): ... 11 more
1 answers
solution1
0 ACCPTED 2015-08-09 10:54:39
Just because you have put your variable declarations after onCreate that does not mean this code will execute after onCreate . All your String members will be initialized before onCreate is called and before EditText members are initialized. Same goes for your double members.
String tb1 = txtb1.getText().toString();
String tb2 = txtb2.getText().toString();
String tb3 = txtb3.getText().toString();
String tb4 = txtb4.getText().toString();
String tb5 = txtb5.getText().toString();
double txb1= Double.parseDouble(tb1);
double txb2= Double.parseDouble(tb2);
double txb3= Double.parseDouble(tb3);
double txb4= Double.parseDouble(tb4);
double txb5= Double.parseDouble(tb5);
You have to move above initialization into onCreate and declare String and double members separately.
...
String tb1, tb2, tb3, tb4, tb5;
double txb1, txb2, txb, txb4, txb5;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fourthxml);
//text boxes
txtb1=(EditText)findViewById(R.id.txtb1);
txtb2=(EditText)findViewById(R.id.txtb2);
txtb3=(EditText)findViewById(R.id.txtb3);
txtb4=(EditText)findViewById(R.id.txtb4);
txtb5=(EditText)findViewById(R.id.txtb5);
//buttons
btnper=(Button)findViewById(R.id.btnper);
//labels/text view
lblgrade=(TextView)findViewById(R.id.lblgrade);
lblper=(TextView)findViewById(R.id.lblgrade);
tb1 = txtb1.getText().toString();
tb2 = txtb2.getText().toString();
tb3 = txtb3.getText().toString();
tb4 = txtb4.getText().toString();
tb5 = txtb5.getText().toString();
txb1= Double.parseDouble(tb1);
txb2= Double.parseDouble(tb2);
txb3= Double.parseDouble(tb3);
txb4= Double.parseDouble(tb4);
txb5= Double.parseDouble(tb5);
}
You are getting NumberFormatException because you are parsing empty string. You can use following method to safely parse double or set its value to some default if string does not contain valid double value.
public double getDoubleOrDefault(String value, double defValue)
{
try
{
return Double.parseDouble(value);
}
catch (Exception ex)
{
return defValue;
}
}
txb1 = getDoubleOrDefault(tb1, 0.0);
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