Bonjour,

Je suis débutant dans la programmation Android sur Android Studio, lorsque je lance mon application, j'obtiens l'erreur :
Error java.LangNullPointerExeption attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference.
S'il-vous-plaît, j'ai passé beaucoup de temps sur cette erreur, je suis bloqué sur mon premier projet, j'ai besoin de votre aide pour continuer.

Merci beaucoup !

Voici mon code :

Code Java :Sélectionner tout -Visualiser dans une fenêtre à part
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package com.my.newproject;
 
import android.app.*;
import android.os.*;
import android.view.*;
import android.view.View.*;
import android.widget.*;
import android.content.*;
import android.graphics.*;
import android.media.*;
import android.net.*;
import android.text.*;
import android.util.*;
import android.webkit.*;
import android.animation.*;
import android.view.animation.*;
import java.util.*;
import java.text.*;
import android.support.v7.app.AppCompatActivity;
import android.widget.LinearLayout;
import android.widget.Button;
import java.util.Timer;
import java.util.TimerTask;
import android.content.Intent;
import android.net.Uri;
import android.animation.ObjectAnimator;
import android.view.animation.LinearInterpolator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.BounceInterpolator;
import android.view.View;
 
public class MainActivity extends AppCompatActivity {
 
	private Timer _timer = new Timer();
 
	private double rotation = 0;
	private double click = 0;
	private double xbk = 0;
 
	private LinearLayout linear1;
	private LinearLayout linear2;
	private Button menu;
	private LinearLayout linear3;
	private LinearLayout linear4;
	private Button button8;
	private Button button2;
	private Button button3;
	private Button button4;
	private Button button5;
	private Button button6;
 
	private TimerTask timer;
	private Intent intent = new Intent();
	private ObjectAnimator ani = new ObjectAnimator();
	private Intent show = new Intent();
	@Override
	protected void onCreate(Bundle _savedInstanceState) {
		super.onCreate(_savedInstanceState);
		setContentView(R.layout.main);
		initialize(_savedInstanceState);
		initializeLogic();
	}
 
	private void initialize(Bundle _savedInstanceState) {
 
		linear1 = (LinearLayout) findViewById(R.id.linear1);
		linear2 = (LinearLayout) findViewById(R.id.linear2);
		menu = (Button) findViewById(R.id.menu);
		linear3 = (LinearLayout) findViewById(R.id.linear3);
		linear4 = (LinearLayout) findViewById(R.id.linear4);
		button8 = (Button) findViewById(R.id.button8);
		button2 = (Button) findViewById(R.id.button2);
		button3 = (Button) findViewById(R.id.button3);
		button4 = (Button) findViewById(R.id.button4);
		button5 = (Button) findViewById(R.id.button5);
		button6 = (Button) findViewById(R.id.button6);
 
		menu.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				click++;
				if (click == 1) {
					ani.setTarget(linear4);
					ani.setPropertyName("translationX");
					ani.setFloatValues((float)(SketchwareUtil.getDip(getApplicationContext(), (int)(-200)) - SketchwareUtil.getDisplayWidthPixels(getApplicationContext())), (float)(0 - SketchwareUtil.getDisplayWidthPixels(getApplicationContext())));
					ani.setDuration((int)(500));
					ani.setRepeatMode(ValueAnimator.REVERSE);
					ani.setRepeatCount((int)(0));
					ani.setInterpolator(new AccelerateInterpolator());
					ani.start();
				}
				else {
					if (click == 2) {
						ani.setTarget(linear4);
						ani.setFloatValues((float)(0 - SketchwareUtil.getDisplayWidthPixels(getApplicationContext())), (float)(SketchwareUtil.getDip(getApplicationContext(), (int)(-200)) - SketchwareUtil.getDisplayWidthPixels(getApplicationContext())));
						ani.start();
						click = 0;
					}
				}
			}
		});
 
		button8.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
 
			}
		});
 
		button2.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				intent.setClass(getApplicationContext(), DonneesActivity.class);
				startActivity(intent);
			}
		});
 
		button3.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				intent.setClass(getApplicationContext(), ClientsActivity.class);
				startActivity(intent);
			}
		});
 
		button4.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				intent.setClass(getApplicationContext(), ProduitsActivity.class);
				startActivity(intent);
			}
		});
 
		button5.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				intent.setClass(getApplicationContext(), EditionfactdevActivity.class);
				startActivity(intent);
			}
		});
 
		button6.setOnClickListener(new View.OnClickListener() {
			@Override
			public void onClick(View _view) {
				intent.setClass(getApplicationContext(), VisuelfactdevActivity.class);
				startActivity(intent);
			}
		});
	}
	private void initializeLogic() {
		click = 0;
	}
 
	@Override
	protected void onActivityResult(int _requestCode, int _resultCode, Intent _data) {
		super.onActivityResult(_requestCode, _resultCode, _data);
 
		switch (_requestCode) {
 
			default:
			break;
		}
	}
 
	@Override
	public void onBackPressed() {
		xbk++;
		if (xbk == 2) {
			xbk = 2;
			finish();
		}
		else {
			SketchwareUtil.showMessage(getApplicationContext(), "Presser 2 fois pour quitter !");
		}
	}
	@Deprecated
	public void showMessage(String _s) {
		Toast.makeText(getApplicationContext(), _s, Toast.LENGTH_SHORT).show();
	}
 
	@Deprecated
	public int getLocationX(View _v) {
		int _location[] = new int[2];
		_v.getLocationInWindow(_location);
		return _location[0];
	}
 
	@Deprecated
	public int getLocationY(View _v) {
		int _location[] = new int[2];
		_v.getLocationInWindow(_location);
		return _location[1];
	}
 
	@Deprecated
	public int getRandom(int _min, int _max) {
		Random random = new Random();
		return random.nextInt(_max - _min + 1) + _min;
	}
 
	@Deprecated
	public ArrayList<Double> getCheckedItemPositionsToArray(ListView _list) {
		ArrayList<Double> _result = new ArrayList<Double>();
		SparseBooleanArray _arr = _list.getCheckedItemPositions();
		for (int _iIdx = 0; _iIdx < _arr.size(); _iIdx++) {
			if (_arr.valueAt(_iIdx))
			_result.add((double)_arr.keyAt(_iIdx));
		}
		return _result;
	}
 
	@Deprecated
	public float getDip(int _input){
		return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, _input, getResources().getDisplayMetrics());
	}
 
	@Deprecated
	public int getDisplayWidthPixels(){
		return getResources().getDisplayMetrics().widthPixels;
	}
 
	@Deprecated
	public int getDisplayHeightPixels(){
		return getResources().getDisplayMetrics().heightPixels;
	}
 
}