我正在创建一个应用,其中观看奖励视频广告时硬币/点数会增加,并且应该在应用中保存这些硬币/点数
例如:每次按钮点击硬币值增加到10点。现在,当我完全销毁应用程序并再次打开它时,点值应显示相同,而不是零
这是我的代码
private TextView mText;
private int coinCount;
mText = (TextView)
findViewById(R.id.money);
coinCount = 0;
mText.setText(" " + coinCount);
Button button = (Button)
findViewById(R.id.buynow);
button.setOnClickListener(new.
View.OnClickListener() {
@Override
public void onClick(View v) {
if (coinCount <= 29) {
//if(coinCount <30) {
new MaterialStyledDialog.Builder(MainActivity.this)
.setTitle("Not Enough Coins")
.setDescription("Watch the Ad To Get 10 coins")
.setIcon(R.drawable.ic_money)
.withIconAnimation(true)
.withDialogAnimation(true)
.withDarkerOverlay(true)
.setHeaderColor(R.color.color)
.setPositiveText("Get some coins")
.onPositive(new MaterialDialog.SingleButtonCallback() {
@Override
public void onClick(@NonNull MaterialDialog dialog, @NonNull DialogAction which) {
mRewardedVideoAd.show();
}
})
.show();
} else {
coinCount = coinCount - 30;
mText.setText(String.valueOf(coinCount));
}
}
});
我的问题是如何在共享首选项中保存硬币值并检索它?
答案 0 :(得分:1)
SharedPreferences preferences = Context.getSharedPreferences("fileName", Context.MODE_PRIVATE);
preferences.edit().putString("coins", 10).apply();
preferences.getString("coins", "value if not yet set");
这里有文档:https://developer.android.com/training/data-storage/shared-preferences