这段文字将在5秒内消失。

    final Toast toast = Toast.makeText(getApplicationContext(), "My Text", Toast.LENGTH_SHORT);
    toast.show();

    Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
           @Override
           public void run() {
               toast.cancel(); 
           }
    }, 5000); // Change to what you want

编辑: 正如Itai Spector在评论中所说，它将显示约3.5秒，所以使用以下代码:

    int toastDuration = 5000; // in MilliSeconds
    Toast mToast = Toast.makeText(this, "My text", Toast.LENGTH_LONG);
    CountDownTimer countDownTimer;
    countDownTimer = new CountDownTimer(toastDuration, 1000) {
        public void onTick(long millisUntilFinished) {
            mToast.show();
        }

        public void onFinish() {
            mToast.cancel();
        }
    };

    mToast.show();
    countDownTimer.start();

用户不能自定义吐司的持续时间。因为NotificationManagerService的scheduleTimeoutLocked()函数没有使用字段duration。源代码如下。

private void scheduleTimeoutLocked(ToastRecord r, boolean immediate)
    {
        Message m = Message.obtain(mHandler, MESSAGE_TIMEOUT, r);
        long delay = immediate ? 0 : (r.duration == Toast.LENGTH_LONG ? LONG_DELAY : SHORT_DELAY);
        mHandler.removeCallbacksAndMessages(r);
        mHandler.sendMessageDelayed(m, delay);
    }

我知道我有点晚了，但我取了Regis_AG的答案，并将其包装在一个助手类中，它工作得很好。

public class Toaster {
  private static final int SHORT_TOAST_DURATION = 2000;

  private Toaster() {}

  public static void makeLongToast(String text, long durationInMillis) {
    final Toast t = Toast.makeText(App.context(), text, Toast.LENGTH_SHORT);
    t.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL, 0, 0);

    new CountDownTimer(Math.max(durationInMillis - SHORT_TOAST_DURATION, 1000), 1000) {
      @Override
      public void onFinish() {
        t.show();
      }

      @Override
      public void onTick(long millisUntilFinished) {
        t.show();
      }
    }.start();
  }
}

在你的应用代码中，就像这样做:

    Toaster.makeLongToast("Toasty!", 8000);

将吐司设置为以毫秒为单位的特定时间段:

public void toast(int millisec, String msg) {
    Handler handler = null;
    final Toast[] toasts = new Toast[1];
    for(int i = 0; i < millisec; i+=2000) {
        toasts[0] = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
        toasts[0].show();
        if(handler == null) {
            handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override
                public void run() {
                    toasts[0].cancel();
                }
            }, millisec);
        }
    }
}

为什么要吃吐司，当你可以拥有整个Snackbar: https://developer.android.com/reference/android/support/design/widget/Snackbar.html

小吃店>吐司，定制吐司，油炸面包丁

使用Crouton，这是一个非常灵活的吐司库。

油煎面包块

你可以像烤面包一样使用它:

Crouton.makeText(context, "YOUR_MESSAGE", Style.INFO);

或者你甚至可以更深入一点，自定义更多，比如将时间设置为无限!例如，在这里我想显示一个toast消息，直到用户通过点击它来确认它。

private static void showMessage(final Activity context, MessageType type, String header, String message) {
    View v = context.getLayoutInflater().inflate(R.layout.toast_layout, null);
    TextView headerTv = (TextView) v.findViewById(R.id.toastHeader);
    headerTv.setText(header);
    TextView messageTv = (TextView) v.findViewById(R.id.toastMessage);
    messageTv.setText(message);
    ImageView toastIcon = (ImageView) v.findViewById(R.id.toastIcon);

    final Crouton crouton = getCrouton(context, v);
    v.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Crouton.hide(crouton);
        }
    });

    crouton.show();
}

private static Crouton getCrouton(final Activity context, View v) {
    Crouton crouton = Crouton.make(context, v);
    crouton.setConfiguration(new Configuration.Builder().setDuration(Configuration.DURATION_INFINITE).build());
    return crouton;
}

自定义布局，将膨胀为吐司。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:animateLayoutChanges="true"
    android:background="@drawable/shadow_container"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:padding="@dimen/default_margin"
    tools:ignore="Overdraw">

    <ImageView
        android:id="@+id/toastIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/default_spacing_full"
        android:layout_weight="1"
        android:orientation="vertical">

        <TextView
            android:id="@+id/toastHeader"
            style="@style/ItemText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <TextView
            android:id="@+id/toastMessage"
            style="@style/ItemSubText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

</LinearLayout>