Je nouveau avec android, j'utilise Android Studio 2.2 pour mon codage et j'essaye de construire ma première application, fondamentalement l'application ne fait pas beaucoup ou maintenant, et après l'ajout d'une méthode de prix à la méthode onClick
pour mon application, l'application se bloque chaque fois que je clique sur le bouton. Ci-dessous, j'ai fourni le message d'erreur et mon propre code.Android: app s'écraser après bouton cliquez
Le message d'erreur que je reçois de mon studio android est aussi copié de la vue logcat:
10-06 09:46:00.338 30789-30789/com.example.abdulkarim.justjava E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.abdulkarim.justjava, PID: 30789
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4660)
at android.view.View$PerformClick.run(View.java:19445)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4660)
at android.view.View$PerformClick.run(View.java:19445)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x2
at android.content.res.Resources.getText(Resources.java:1431)
at android.support.v7.widget.ResourcesWrapper.getText(ResourcesWrapper.java:52)
at android.widget.TextView.setText(TextView.java:4954)
at com.example.abdulkarim.justjava.MainActivity.display(MainActivity.java:33)
at com.example.abdulkarim.justjava.MainActivity.submit(MainActivity.java:24)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4660)
at android.view.View$PerformClick.run(View.java:19445)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
10-06 09:47:13.823 30789-30789/? I/Process: Sending signal. PID: 30789 SIG: 9
Voici mon code MainActivity.java
package com.example.abdulkarim.justjava;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import java.text.NumberFormat;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
/**
* This method is called when the order button is clicked.
*/
public void submit(View view){
int numberOfCoffees = 2;
display(numberOfCoffees);
displayPrice(numberOfCoffees * 10);
}
/**
* This method displays the given quantity on the screen
*/
private void display(int number){
TextView quantityTextView = (TextView) findViewById(R.id.quantity_text_view);
quantityTextView.setText(number);
}
/**
* This method displays the given price on the screen
*/
private void displayPrice(int number){
TextView priceTextView = (TextView) findViewById(R.id.price_text_view);
priceTextView.setText(NumberFormat.getCurrencyInstance().format(number));
}
}
et voici mon code de mise en page de main_activity .xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="com.example.abdulkarim.justjava.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Quantity"
android:textAllCaps="true"
android:textSize="16sp"
android:textColor="@android:color/darker_gray"
android:layout_marginBottom="16dp"/>
<TextView
android:id="@+id/quantity_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="0"
android:textSize="16sp"
android:textColor="@android:color/black"
android:layout_marginBottom="16dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Price"
android:textAllCaps="true"
android:textSize="16sp"
android:textColor="@android:color/darker_gray"
android:layout_marginBottom="16dp"/>
<TextView
android:id="@+id/price_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="$0"
android:textSize="16sp"
android:textColor="@android:color/black"
android:layout_marginBottom="16dp"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Order"
android:textAllCaps="true"
android:textSize="16sp"
android:onClick="submit"/>
</LinearLayout>
S'il vous plaît aidez-moi à trouver l'erreur dans mon code.
Modifier ce 'quantityTextView.setText (nombre),' 'à quantityTextView.setText (String.valueOf (number).) De même dans d'autres endroits – Raghunandan