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POAdd object to an array object is not work in android
 

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  1. POAdd object to an array object is not work in android
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    <p>I am a new experience of Android. Could anyone help me out with my problem? I want to create a game Tiger fighting with Cow (it is board game). I have a class Piece can be setType as Tiger or Cow and I want to create an array of this class like below.</p> <p>*Note: Piece is extends ImageView</p> <pre><code>Piece[] tigers = new Piece[4]; for(int i = 0; i &lt; tigers.length; i++) { tigers[i] = new Piece(context); tigers[i].setType(R.drawable.tiger); } </code></pre> <p>Here is my Piece class:</p> <pre><code>package com.camitss.klasikou; import android.content.Context; import android.util.Log; import android.widget.ImageView; public class Piece extends ImageView{ private int type; public Piece(Context context){ super(context); super.setScaleType(ImageView.ScaleType.CENTER_CROP); super.setPadding(4, 4, 4, 4); } public int getType() { return this.type; } public void setType(int type) { this.type = type; } } </code></pre> <p>Here is my MainActivity.java</p> <pre><code>package com.camitss.klasikou; import com.camitss.klasikou.R; import android.app.Activity; import android.content.Context; import android.os.Bundle; import android.view.Gravity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.widget.GridView; import android.widget.LinearLayout; import android.widget.RelativeLayout; public class MainActivity extends Activity implements OnClickListener{ private LinearLayout llNewGame; private LinearLayout llInstruction; private LinearLayout llOption; private LinearLayout llAbout; private LinearLayout llCow; private LinearLayout llTiger; private RelativeLayout p_new_game; private RelativeLayout p_instruction; private GridView p_fighting; public static ImageAdapter imgAdt; Context context; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.activity_main); llNewGame = (LinearLayout) findViewById(R.id.l_new_game); llNewGame.setOnClickListener(this); llInstruction = (LinearLayout) findViewById(R.id.l_instruction); llInstruction.setOnClickListener(this); llOption = (LinearLayout) findViewById(R.id.l_option); llOption.setOnClickListener(this); llAbout = (LinearLayout) findViewById(R.id.l_about); llAbout.setOnClickListener(this); llCow = (LinearLayout) findViewById(R.id.l_cow); llCow.setOnClickListener(this); llTiger = (LinearLayout) findViewById(R.id.l_tiger); llTiger.setOnClickListener(this); p_new_game = (RelativeLayout) findViewById(R.id.page_new_game); p_instruction = (RelativeLayout) findViewById(R.id.page_instruction); p_fighting = (GridView) findViewById(R.id.page_fighting); imgAdt = new ImageAdapter(this); boardInit(); p_fighting.setAdapter(imgAdt); p_fighting.setGravity(Gravity.CENTER); } private void llOff(LinearLayout llNewGame, LinearLayout llInstruction, LinearLayout llOption, LinearLayout llAbout) { llNewGame.setBackgroundResource(R.drawable.menu_newgame); llInstruction.setBackgroundResource(R.drawable.menu_instructions); llOption.setBackgroundResource(R.drawable.menu_options); llAbout.setBackgroundResource(R.drawable.menu_about); } private void wrapInvisible(RelativeLayout p_new_game, RelativeLayout p_instruction) { p_new_game.setVisibility(View.GONE); p_instruction.setVisibility(View.GONE); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } @Override public void onClick(View v) { // TODO Auto-generated method stub if (v.getId() == R.id.page_fighting) { } if (v.getId() == R.id.l_cow) { p_new_game.setVisibility(View.GONE); p_fighting.setVisibility(View.VISIBLE); } if (v.getId() == R.id.l_tiger) { p_new_game.setVisibility(View.GONE); p_fighting.setVisibility(View.VISIBLE); } if (v.getId() == R.id.l_new_game) { llOff(llNewGame, llInstruction, llOption, llAbout); wrapInvisible(p_new_game, p_instruction); llNewGame.setBackgroundResource(R.drawable.menu_newgame_on); p_new_game.setVisibility(View.VISIBLE); } if (v.getId() == R.id.l_instruction) { llOff(llNewGame, llInstruction, llOption, llAbout); wrapInvisible(p_new_game, p_instruction); llInstruction.setBackgroundResource(R.drawable.menu_instructions_on); p_instruction.setVisibility(View.VISIBLE); } if (v.getId() == R.id.l_option) { llOff(llNewGame, llInstruction, llOption, llAbout); llOption.setBackgroundResource(R.drawable.menu_options_on); } if (v.getId() == R.id.l_about) { llOff(llNewGame, llInstruction, llOption, llAbout); llAbout.setBackgroundResource(R.drawable.menu_about_on); } } public void boardInit(){ Piece[] tigers = new Piece[4]; for(int i = 0; i &lt; tigers.length; i++) { tigers[i] = new Piece(context); tigers[i].setType(R.drawable.tiger); } } } </code></pre> <p>Here is my ImageAdapter.java</p> <pre><code>package com.camitss.klasikou; import android.content.Context; import android.database.DataSetObserver; import android.view.View; import android.view.ViewGroup; import android.widget.GridView; import android.widget.ImageView; import android.widget.ListAdapter; public class ImageAdapter implements ListAdapter { private Context mContext; public Integer[] board = {0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0}; public ImageAdapter(Context c) { mContext = c; } public void setObjectToBoard(int type, int position) { board[position] = type; } @Override public int getCount() { // TODO Auto-generated method stub return this.board.length; } @Override public Object getItem(int position) { // TODO Auto-generated method stub return this.board[position]; // return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return 0; } @Override public int getItemViewType(int position) { // TODO Auto-generated method stub return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { // if it's not recycled, initialize some attributes imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(57, 58)); } else { imageView = (ImageView) convertView; } imageView.setImageResource(board[position]); return imageView; } @Override public int getViewTypeCount() { // TODO Auto-generated method stub return 1; } @Override public boolean hasStableIds() { // TODO Auto-generated method stub return false; } @Override public boolean isEmpty() { // TODO Auto-generated method stub return false; } @Override public void registerDataSetObserver(DataSetObserver observer) { // TODO Auto-generated method stub } @Override public void unregisterDataSetObserver(DataSetObserver observer) { // TODO Auto-generated method stub } @Override public boolean areAllItemsEnabled() { // TODO Auto-generated method stub return false; } @Override public boolean isEnabled(int position) { // TODO Auto-generated method stub return false; } } </code></pre> <p>The problem is can not add new objects to that array. What is wrong with this and how should I do?</p> <p>Error:</p> <pre><code>03-12 10:36:17.376: E/AndroidRuntime(1331): FATAL EXCEPTION: main 03-12 10:36:17.376: E/AndroidRuntime(1331): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.camitss.klasikou/com.camitss.klasikou.MainActivity}: java.lang.NullPointerException 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread.access$600(ActivityThread.java:122) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.os.Handler.dispatchMessage(Handler.java:99) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.os.Looper.loop(Looper.java:137) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread.main(ActivityThread.java:4340) 03-12 10:36:17.376: E/AndroidRuntime(1331): at java.lang.reflect.Method.invokeNative(Native Method) 03-12 10:36:17.376: E/AndroidRuntime(1331): at java.lang.reflect.Method.invoke(Method.java:511) 03-12 10:36:17.376: E/AndroidRuntime(1331): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 03-12 10:36:17.376: E/AndroidRuntime(1331): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 03-12 10:36:17.376: E/AndroidRuntime(1331): at dalvik.system.NativeStart.main(Native Method) 03-12 10:36:17.376: E/AndroidRuntime(1331): Caused by: java.lang.NullPointerException 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.view.ViewConfiguration.get(ViewConfiguration.java:314) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.view.View.&lt;init&gt;(View.java:2693) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.widget.ImageView.&lt;init&gt;(ImageView.java:104) 03-12 10:36:17.376: E/AndroidRuntime(1331): at com.camitss.klasikou.Piece.&lt;init&gt;(Piece.java:9) 03-12 10:36:17.376: E/AndroidRuntime(1331): at com.camitss.klasikou.MainActivity.boardInit(MainActivity.java:134) 03-12 10:36:17.376: E/AndroidRuntime(1331): at com.camitss.klasikou.MainActivity.onCreate(MainActivity.java:66) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.Activity.performCreate(Activity.java:4465) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049) 03-12 10:36:17.376: E/AndroidRuntime(1331): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919) 03-12 10:36:17.376: E/AndroidRuntime(1331): ... 11 more </code></pre>
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    3. CODouble check that each loop is using the correct array length.
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