我想數 5 秒并啟動一個功能。該函數還需要每 3 秒調用一次。Toast.makeText(this, "Countdown 5", Toast.LENGTH_SHORT).show();Handler handler = new Handler();for (int i = 5; i >= 0; --i) { final int idx = i; handler.postDelayed(() -> { Toast.makeText(MyActivity.this, "Countdown " + (idx - 1), Toast.LENGTH_SHORT).show(); if (idx == 0) { int messageSize = messageItems.size(); for (int j = 0; j < messageSize; j++) { final int jdx = j; Handler handler1 = new Handler(); handler1.postDelayed(() -> { Toast.makeText(MyActivity.this, messageItems.get(jdx), Toast.LENGTH_SHORT).show(); }, 3000 * jdx); } } }, 1000 * (5-idx));}內循環部分在沒有外循環的情況下效果很好。 int messageSize = messageItems.size(); for (int j = 0; j < messageSize; j++) { final int jdx = j; Handler handler1 = new Handler(); handler1.postDelayed(() -> { Toast.makeText(MyActivity.this, messageItems.get(jdx), Toast.LENGTH_SHORT).show(); }, 3000 * jdx); }我想添加一個功能，比如 5 秒倒計時。然后啟動 Toast Message。而且 Toast 消息也需要每 3 秒敬酒一次。
1 回答
慕田峪9158850
TA貢獻1794條經驗 獲得超7個贊
試試這個代碼。這給出了相當準確的結果。有時會有一些滯后，但不會明顯。Tweek 這個來展示你的祝酒詞。
int counter = 5;
Handler handler = new Handler();
ArrayList<String> messageItems = new ArrayList<>();
messageItems.add("Message 1");
messageItems.add("Message 2");
messageItems.add("Message 3");
Runnable runnable = new Runnable() {
@Override
public void run() {
counter--;
if (counter > 0) {
Log.d("HOME", "onCreate: countdown " + counter + " " + System.currentTimeMillis());
handler.postDelayed(this, 1000);
}
if (counter == 1) {
for (int j = 0; j < messageItems.size(); j++) {
final int jdx = j;
Handler handler1 = new Handler();
handler1.postDelayed(() -> {
Log.d("HOME", "onCreate: countdown " + messageItems.get(jdx) + " " + System.currentTimeMillis());
}, 3000 * jdx);
}
}
}
};
Log.d("HOME", "onCreate: countdown 5 " + System.currentTimeMillis());
handler.postDelayed(runnable, 1000);
以下是計時的輸出 -
Countdown 5 1551720212370
+1004
Countdown 4 1551720213374
+1019
Countdown 3 1551720214393
+1013
Countdown 2 1551720215406
+1568
Countdown 1 1551720216974
+413
Message 1 1551720217387
+2589
Message 2 1551720219976
+2999
Message 3 1551720222975
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