我正在开发一个游戏程序，我想在按钮中存储图像。当用户再次玩游戏时，我想随机化按钮中显示的图像，但我不知道如何随机化图像。
public class MainActivity extends Activity {
public static final String COME_FROM = "come_from";
private int[] id_mc = new int[16];
private Integer[][] img_mc = new Integer [16][2];
private Button[] myMcs = new Button[16];
private int mc_counter = 0;
private int firstid = 0;
private int secondid = 0;
private Boolean mc_isfirst = false;
private int correctcounter = 0;
private TextView tFeedback;
private MediaPlayer mp;
private Boolean b_snd_inc, b_snd_cor;
Random r = new Random();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.activity_main);
Toast.makeText(this, "onCreate", Toast.LENGTH_SHORT).show();
initGame();
}
private void initGame() {
setContentView(R.layout.activity_main);
SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
b_snd_cor =settings.getBoolean("play_sound_when_correct", true);
b_snd_inc =settings.getBoolean("play_sound_when_incorrect", true);
mc_counter = 0;
firstid = 0;
secondid = 0;
mc_isfirst = false;
correctcounter = 0;
tFeedback = (TextView) findViewById(R.id.mc_feedback);
// setup button listeners
Button startButton = (Button) findViewById(R.id.game_menu);
startButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startMenu();
}
});
Button settingsButton = (Button) findViewById(R.id.game_settings);
settingsButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
startPrefs();
}
});
// fill arrays with resources
id_mc[0] = R.id.mc0;
id_mc[1] = R.id.mc1;
id_mc[2] = R.id.mc2;
id_mc[3] = R.id.mc3;
id_mc[4] = R.id.mc4;
id_mc[5] = R.id.mc5;
id_mc[6] = R.id.mc6;
id_mc[7] = R.id.mc7;
id_mc[8] = R.id.mc8;
id_mc[9] = R.id.mc9;
id_mc[10] = R.id.mc10;
id_mc[11] = R.id.mc11;
id_mc[12] = R.id.mc12;
id_mc[13] = R.id.mc13;
id_mc[14] = R.id.mc14;
id_mc[15] = R.id.mc15;
img_mc[0][0] = R.drawable.back1;
img_mc[0][1] = R.drawable.ic_img1;
img_mc[1][0] = R.drawable.back2;
img_mc[1][1] = R.drawable.ic_img2;
img_mc[2][0] = R.drawable.back3;
img_mc[2][1] = R.drawable.ic_img3;
img_mc[3][0] = R.drawable.back4;
img_mc[3][1] = R.drawable.ic_img4;
img_mc[4][0] = R.drawable.back5;
img_mc[4][1] = R.drawable.ic_img5;
img_mc[5][0] = R.drawable.back6;
img_mc[5][1] = R.drawable.ic_img6;
img_mc[6][0] = R.drawable.back7;
img_mc[6][1] = R.drawable.ic_img7;
img_mc[7][0] = R.drawable.back8;
img_mc[7][1] = R.drawable.ic_img8;
img_mc[8][0] = R.drawable.back1;
img_mc[8][1] = R.drawable.ic_img1;
img_mc[9][0] = R.drawable.back2;
img_mc[9][1] = R.drawable.ic_img2;
img_mc[10][0] = R.drawable.back3;
img_mc[10][1] = R.drawable.ic_img3;
img_mc[11][0] = R.drawable.back4;
img_mc[11][1] = R.drawable.ic_img4;
img_mc[12][0] = R.drawable.back5;
img_mc[12][1] = R.drawable.ic_img5;
img_mc[13][0] = R.drawable.back6;
img_mc[13][1] = R.drawable.ic_img6;
img_mc[14][0] = R.drawable.back7;
img_mc[14][1] = R.drawable.ic_img7;
img_mc[15][0] = R.drawable.back8;
img_mc[15][1] = R.drawable.ic_img8;
//Collections.shuffle(Arrays.asList(img_mc));
for (int i = 0; i < 16; i++) {
try{
myMcs[i] = (Button) findViewById(id_mc[i]);
myMcs[i].setBackgroundResource(img_mc[i][0]);
myMcs[i].setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
int i = 0;
for (int n = 0; n < 16; n++) {
if (id_mc[n] == view.getId())
i = n;
}
doClickAction(view, i);
}
});
}catch(Exception e)
{
Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}}
}
private void doClickAction(View v, int i)
{
v.setBackgroundResource(img_mc[i][1]);
mc_isfirst = !mc_isfirst;
// disable all buttons
for (Button b : myMcs) {
b.setEnabled(false);
}
if (mc_isfirst) {
// turning the first card
firstid = i;
// re enable all except this one
for (Button b : myMcs) {
if (b.getId() != firstid) {
b.setEnabled(true);
}
}
} else {
// turning the second card
secondid = i;
doPlayMove();
}
}
private void doPlayMove() {
mc_counter++;
if (img_mc[firstid][1] - img_mc[secondid][1] == 0) {
//correct
if (b_snd_cor) playSound(R.raw.correct);
waiting(200);
myMcs[firstid].setVisibility(View.INVISIBLE);
myMcs[secondid].setVisibility(View.INVISIBLE);
correctcounter++;
} else {
//incorrect
if (b_snd_inc) playSound(R.raw.incorrect);
waiting(400);
}
// reenable and turn cards back
for (Button b : myMcs) {
if (b.getVisibility() != View.INVISIBLE) {
b.setEnabled(true);
b.setBackgroundResource(R.drawable.memory_back);
for (int i = 0; i < 16; i++) {
myMcs[i].setBackgroundResource(img_mc[i][0]);
}
}
}
tFeedback.setText("" + correctcounter + " / " + mc_counter);
if (correctcounter > 7) {
Intent iSc = new Intent(getApplicationContext(), Scoreboard.class);
iSc.putExtra("com.gertrietveld.memorygame.SCORE", mc_counter);
startActivity(iSc);
finish();
}
}
public void playSound(int sound) {
mp = MediaPlayer.create(this, sound);
mp.setVolume((float).5,(float).5);
mp.start();
mp.setOnCompletionListener(new OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
mp.release();
}
});
}
public static void waiting(int n) {
long t0, t1;
t0 = System.currentTimeMillis();
do {
t1 = System.currentTimeMillis();
} while ((t1 - t0) < (n));
}
private void startMenu() {
Intent launchMenu = new Intent(this, MenuScreen.class);
launchMenu.putExtra(COME_FROM,"PlayGame");
startActivity(launchMenu);
}
private void startPrefs() {
Intent launchPrefs = new Intent(this, Setting.class);
startActivity(launchPrefs);
}
////////////////////////////////
@Override
protected void onRestart() {
super.onRestart();
//String sender = getIntent().getExtras().getString("SENDER");
//initGame();
Toast.makeText(this, "onRestart-sender is " , Toast.LENGTH_SHORT).show();
}
@Override
protected void onResume() {
super.onResume();
SharedPreferences settings = getSharedPreferences("memoryPrefs", 0);
b_snd_cor =settings.getBoolean("play_sound_when_correct", true);
b_snd_inc =settings.getBoolean("play_sound_when_incorrect", true);
Toast.makeText(this, "onResume", Toast.LENGTH_SHORT).show();
}
////////////////////////////////
}
答案 0 :(得分：0)
你的Collections.shuffle()部分是正确的，你只需要将随机列表放回到你的数组中：
private Integer[][] img_mc = new Integer [16][2];
...
List<Integer[]> img_mc_list = new ArrayList<Integer[]>();
for (Integer[] img : img_mc) {
img_mc_list.add(img);
}
Collections.shuffle(img_mc_list);
img_mc_list.toArray(img_mc);
或者使用它：
private void randomize(Integer[][] array) {
int index;
Integer[] temp;
Random random = new Random();
for (int i = array.length - 1; i > 0; i--) {
index = random.nextInt(i + 1);
temp = array[index];
array[index] = array[i];
array[i] = temp;
}
}