Discussion :

[pitchu]

Bonjour,
Lorsque je compile mon programme j'obtiens cette erreur

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03-28 20:25:35.571      949-949/com.example.user.cercles E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.user.cercles/com.example.user.cercles.MainActivity}: java.lang.NullPointerException
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
            at android.app.ActivityThread.access$600(ActivityThread.java:130)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            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:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.NullPointerException
            at android.content.ContextWrapper.getResources(ContextWrapper.java:81)
            at android.view.View.<init>(View.java:3228)
            at com.example.user.cercles.MyView.<init>(MyView.java:25)
            at com.example.user.cercles.MainActivity.<init>(MainActivity.java:59)
            at java.lang.Class.newInstanceImpl(Native Method)
            at java.lang.Class.newInstance(Class.java:1319)
            at android.app.Instrumentation.newActivity(Instrumentation.java:1053)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)
************at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
************at android.app.ActivityThread.access$600(ActivityThread.java:130)
************at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
************at android.os.Handler.dispatchMessage(Handler.java:99)
************at android.os.Looper.loop(Looper.java:137)
************at android.app.ActivityThread.main(ActivityThread.java:4745)
************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:786)
************at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
************at dalvik.system.NativeStart.main(Native Method)

Code :

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public class MainActivity extends ActionBarActivity {
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //setContentView(new MyView(this));
 
        Button boutonOk = (Button)findViewById(R.id.ok);
        boutonOk.setOnClickListener(okOnClick);
 
    }
 
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }
 
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
 
        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }
 
        return super.onOptionsItemSelected(item);
    }
 
 
    EditText varNbCercle;
    EditText varEpaisseur;
 
    String StrNbCercle;
    String StrEpaisseur;
 
    int intNbCercle;
    int intEpaisseur;
 
   MyView Cercle = new MyView(this);
 
 
   private View.OnClickListener okOnClick = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
 
            varNbCercle = (EditText) findViewById(R.id.nbCercle);
            varEpaisseur = (EditText) findViewById(R.id.epaisseur);
 
            StrNbCercle = varNbCercle.getText().toString();
            StrEpaisseur = varEpaisseur.getText().toString();
 
            try {
                intNbCercle = Integer.parseInt(StrNbCercle);
                intEpaisseur = Integer.parseInt(StrEpaisseur);
 
                Cercle.setNbCercle(intNbCercle);
                Cercle.setEpaisseur(intEpaisseur);
 
                Cercle.invalidate();//force l'appel de onDraw()
 
            }
 
            catch (NumberFormatException nfe) {}
 
        }
    };
 
}