初学Android练习用，20以内加减法运算练习（代码经调试通过，GridView-动态数组-wav）

package x.AdderSanXiao; import java.util.ArrayList; import java.util.HashMap; import android.app.Activity; import android.content.Context; import android.graphics.Color; import android.media.AudioManager; import android.media.SoundPool; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.GridView; import android.widget.SimpleAdapter; import android.widget.TextView; public class AdderSanXiao extends Activity implements OnClickListener{// /** Called when the activity is first created. */ Button button01; TextView textview01; EditText EditText01; private int op1; private int op2; int op3; public static final int SOUND_EXPLOSION = 1; public static final int SOUND_ZHENGQUE = 2; //zhengque =正确 private SoundPool soundPool; private HashMap soundPoolMap; //Button button01=(Button)findViewById(R.id.Button01); public void onClick(View vABB){ if (vABB == button01){ //button01.setText("vABB=button01"); this.setTitle("加油，三笑！"); textview01.setText("vABB=button01"); op3=getRandomOp1Op2(0,10); textview01.setText(" "+op1+" + "+op2+" = "); EditText01.setBackgroundColor(Color.WHITE); EditText01.setText("?"); //EditText01. explode(); } } @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); initSounds(); GridView gridview = (GridView) findViewById(R.id.gridview); //button01.setOnClickListener(this); button01= new Button(this); button01=(Button)findViewById(R.id.Button01); button01.setOnClickListener(this); textview01= new TextView(this); textview01=(TextView)findViewById(R.id.textview01); EditText01= new EditText(this); EditText01=(EditText)findViewById(R.id.EditText01); //生成动态数组，并且转入数据 ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>(); for(int i=1;i<=20;i++) { HashMap<String, Object> map = new HashMap<String, Object>(); map.put("ItemImage", R.drawable.icon);//添加图像资源的ID map.put("ItemText", ""+String.valueOf(i));//按序号做ItemText lstImageItem.add(map); } //生成适配器的ImageItem <====> 动态数组的元素，两者一一对应 SimpleAdapter saImageItems = new SimpleAdapter(this, //没什么解释 lstImageItem,//数据来源 R.layout.night_item,//night_item的XML实现 //动态数组与ImageItem对应的子项 new String[] {"ItemImage","ItemText"}, //ImageItem的XML文件里面的一个ImageView,两个TextView ID new int[] {R.id.ItemImage,R.id.ItemText}); //添加并且显示 gridview.setAdapter(saImageItems); //添加消息处理 gridview.setOnItemClickListener((OnItemClickListener) new ItemClickListener()); // button01.setOnClickListener((OnClickListener) new ClickListener()); } //当AdapterView被单击(触摸屏或者键盘)，则返回的Item单击事件 class ItemClickListener implements OnItemClickListener { public void onItemClick(AdapterView<?> arg0,//The AdapterView where the click happened View arg1,//The view within the AdapterView that was clicked int arg2,//The position of the view in the adapter long arg3//The row id of the item that was clicked ) { //在本例中arg2=arg3 HashMap<String, Object> item=(HashMap<String, Object>) arg0.getItemAtPosition(arg2); //显示所选Item的ItemText //setTitle((String)item.get("ItemText")); {String str_op3_FAQ =(String)item.get("ItemText"); int op3_FAQ=Integer.parseInt(str_op3_FAQ); EditText01.setText(str_op3_FAQ); if(op3_FAQ ==op3){ //setTitle("OK"); playSound(SOUND_ZHENGQUE); EditText01.setBackgroundColor(Color.GREEN); } else { //setTitle("Error"); EditText01.setBackgroundColor(Color.RED); } } } } public int getRandomOp1Op2(int start,int end){ int i = 0; while(i<20) { op1=getRandom(0,20); op2=getRandom(0,20); if(op1+op2<=20 && op1+op2>=10 )break; i++; } return(op1+op2) ; } public static int getRandom(int start,int end){ if(start>end || start<0 || end<0){return -1;} return(int)(Math.random()*(end-start+1))+start; } private void initSounds() { soundPool = new SoundPool(4, AudioManager.STREAM_MUSIC, 100); soundPoolMap = new HashMap(); soundPoolMap.put(SOUND_EXPLOSION, soundPool.load(getBaseContext(), R.raw.boru, 1)); soundPoolMap.put(SOUND_ZHENGQUE, soundPool.load(getBaseContext(), R.raw.zhengque, 1)); }// 只支持wav声音格式的文件 public void playSound(int sound) { AudioManager mgr = (AudioManager)getBaseContext().getSystemService(Context.AUDIO_SERVICE); float streamVolumeCurrent = mgr.getStreamVolume(AudioManager.STREAM_MUSIC); float streamVolumeMax = mgr.getStreamMaxVolume(AudioManager.STREAM_MUSIC); float volume = streamVolumeCurrent / streamVolumeMax; soundPool.play((Integer) soundPoolMap.get(sound), 1, 1, 1, 0, 1f); } public void explode() { playSound(SOUND_EXPLOSION); } }