如果你深入挖掘android代码，你会发现这些行清楚地表明，我们不能改变Toast消息的持续时间。

 NotificationManagerService.scheduleTimeoutLocked() {
    ...
    long delay = immediate ? 0 : (r.duration == Toast.LENGTH_LONG ? LONG_DELAY : SHORT_DELAY);
    }

持续时间的默认值为

private static final int LONG_DELAY = 3500; // 3.5 seconds
private static final int SHORT_DELAY = 2000; // 2 seconds

我已经开发了一个自定义吐司类，您可以显示吐司所需的持续时间(以毫秒计)

import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.util.Log;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;

public final class ToastHelper {

    private static final String TAG = ToastHelper.class.getName();

    public static interface OnShowListener {
        public void onShow(ToastHelper toast);
    }

    public static interface OnDismissListener {
        public void onDismiss(ToastHelper toast);
    }

    private static final int WIDTH_PADDING_IN_DIP = 25;
    private static final int HEIGHT_PADDING_IN_DIP = 15;
    private static final long DEFAULT_DURATION_MILLIS = 2000L;

    private final Context context;
    private final WindowManager windowManager;
    private View toastView;

    private int gravity = Gravity.CENTER_HORIZONTAL | Gravity.BOTTOM;
    private int mX;
    private int mY;
    private long duration = DEFAULT_DURATION_MILLIS;
    private CharSequence text = "";
    private int horizontalMargin;
    private int verticalMargin;
    private WindowManager.LayoutParams params;
    private Handler handler;
    private boolean isShowing;
    private boolean leadingInfinite;

    private OnShowListener onShowListener;
    private OnDismissListener onDismissListener;

    private final Runnable timer = new Runnable() {

        @Override
        public void run() {
            cancel();
        }
    };

    public ToastHelper(Context context) {
        Context mContext = context.getApplicationContext();
        if (mContext == null) {
            mContext = context;
        }
        this.context = mContext;
        windowManager = (WindowManager) mContext
                .getSystemService(Context.WINDOW_SERVICE);
        init();
    }

    private void init() {
        mY = context.getResources().getDisplayMetrics().widthPixels / 5;
        params = new WindowManager.LayoutParams();
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        params.width = WindowManager.LayoutParams.WRAP_CONTENT;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        params.format = android.graphics.PixelFormat.TRANSLUCENT;
        params.type = WindowManager.LayoutParams.TYPE_TOAST;
        params.setTitle("ToastHelper");
        params.alpha = 1.0f;
        // params.buttonBrightness = 1.0f;
        params.packageName = context.getPackageName();
        params.windowAnimations = android.R.style.Animation_Toast;
    }

    @SuppressWarnings("deprecation")
    @android.annotation.TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    private View getDefaultToastView() {
        TextView textView = new TextView(context);
        textView.setText(text);
        textView.setGravity(Gravity.CENTER_VERTICAL | Gravity.START);
        textView.setClickable(false);
        textView.setFocusable(false);
        textView.setFocusableInTouchMode(false);
        textView.setTextColor(android.graphics.Color.WHITE);
        // textView.setBackgroundColor(Color.BLACK);
        android.graphics.drawable.Drawable drawable = context.getResources()
                .getDrawable(android.R.drawable.toast_frame);
        if (Build.VERSION.SDK_INT < 16) {
            textView.setBackgroundDrawable(drawable);
        } else {
            textView.setBackground(drawable);
        }
        int wP = getPixFromDip(context, WIDTH_PADDING_IN_DIP);
        int hP = getPixFromDip(context, HEIGHT_PADDING_IN_DIP);
        textView.setPadding(wP, hP, wP, hP);
        return textView;
    }

    private static int getPixFromDip(Context context, int dip) {
        return (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP,
                dip, context.getResources().getDisplayMetrics());
    }

    public void cancel() {
        removeView(true);
    }

    private void removeView(boolean invokeListener) {
        if (toastView != null && toastView.getParent() != null) {
            try {
                Log.i(TAG, "Cancelling Toast...");
                windowManager.removeView(toastView);
                handler.removeCallbacks(timer);
            } finally {
                isShowing = false;
                if (onDismissListener != null && invokeListener) {
                    onDismissListener.onDismiss(this);
                }
            }
        }
    }

    public void show() {
        if (leadingInfinite) {
            throw new InfiniteLoopException(
                    "Calling show() in OnShowListener leads to infinite loop.");
        }
        cancel();
        if (onShowListener != null) {
            leadingInfinite = true;
            onShowListener.onShow(this);
            leadingInfinite = false;
        }
        if (toastView == null) {
            toastView = getDefaultToastView();
        }
        params.gravity = android.support.v4.view.GravityCompat
                .getAbsoluteGravity(gravity, android.support.v4.view.ViewCompat
                        .getLayoutDirection(toastView));
        if ((gravity & Gravity.HORIZONTAL_GRAVITY_MASK) == Gravity.FILL_HORIZONTAL) {
            params.horizontalWeight = 1.0f;
        }
        if ((gravity & Gravity.VERTICAL_GRAVITY_MASK) == Gravity.FILL_VERTICAL) {
            params.verticalWeight = 1.0f;
        }
        params.x = mX;
        params.y = mY;
        params.verticalMargin = verticalMargin;
        params.horizontalMargin = horizontalMargin;

        removeView(false);
        windowManager.addView(toastView, params);
        isShowing = true;
        if (handler == null) {
            handler = new Handler();
        }
        handler.postDelayed(timer, duration);
    }

    public boolean isShowing() {
        return isShowing;
    }

    public void setDuration(long durationMillis) {
        this.duration = durationMillis;
    }

    public void setView(View view) {
        removeView(false);
        toastView = view;
    }

    public void setText(CharSequence text) {
        this.text = text;
    }

    public void setText(int resId) {
        text = context.getString(resId);
    }

    public void setGravity(int gravity, int xOffset, int yOffset) {
        this.gravity = gravity;
        mX = xOffset;
        mY = yOffset;
    }

    public void setMargin(int horizontalMargin, int verticalMargin) {
        this.horizontalMargin = horizontalMargin;
        this.verticalMargin = verticalMargin;
    }

    public long getDuration() {
        return duration;
    }

    public int getGravity() {
        return gravity;
    }

    public int getHorizontalMargin() {
        return horizontalMargin;
    }

    public int getVerticalMargin() {
        return verticalMargin;
    }

    public int getXOffset() {
        return mX;
    }

    public int getYOffset() {
        return mY;
    }

    public View getView() {
        return toastView;
    }

    public void setOnShowListener(OnShowListener onShowListener) {
        this.onShowListener = onShowListener;
    }

    public void setOnDismissListener(OnDismissListener onDismissListener) {
        this.onDismissListener = onDismissListener;
    }

    public static ToastHelper makeText(Context context, CharSequence text,
            long durationMillis) {
        ToastHelper helper = new ToastHelper(context);
        helper.setText(text);
        helper.setDuration(durationMillis);
        return helper;
    }

    public static ToastHelper makeText(Context context, int resId,
            long durationMillis) {
        String string = context.getString(resId);
        return makeText(context, string, durationMillis);
    }

    public static ToastHelper makeText(Context context, CharSequence text) {
        return makeText(context, text, DEFAULT_DURATION_MILLIS);
    }

    public static ToastHelper makeText(Context context, int resId) {
        return makeText(context, resId, DEFAULT_DURATION_MILLIS);
    }

    public static void showToast(Context context, CharSequence text) {
        makeText(context, text, DEFAULT_DURATION_MILLIS).show();
    }

    public static void showToast(Context context, int resId) {
        makeText(context, resId, DEFAULT_DURATION_MILLIS).show();
    }

    private static class InfiniteLoopException extends RuntimeException {
        private static final long serialVersionUID = 6176352792639864360L;

        private InfiniteLoopException(String msg) {
            super(msg);
        }
    }
}

创建略长的消息的一个非常简单的方法如下:

private Toast myToast;

public MyView(Context context) {
  myToast = Toast.makeText(getContext(), "", Toast.LENGTH_LONG);
}

private Runnable extendStatusMessageLengthRunnable = new Runnable() {
  @Override
    public void run() {
    //Show the toast for another interval.
    myToast.show();
   }
}; 

public void displayMyToast(final String statusMessage, boolean extraLongDuration) {
  removeCallbacks(extendStatusMessageLengthRunnable);

  myToast.setText(statusMessage);
  myToast.show();

  if(extraLongDuration) {
    postDelayed(extendStatusMessageLengthRunnable, 3000L);
  }
}

注意，上面的示例消除了LENGTH_SHORT选项以保持示例简单。

通常不希望使用Toast消息在很长时间间隔内显示消息，因为这不是Toast类的预期目的。但是有时候，你需要显示的文本量可能需要用户超过3.5秒的时间来阅读，在这种情况下，稍微延长时间(例如，如上所示，到6.5秒)可能是有用的，并且与预期的用法一致。

吐司持续时间可以使用专门运行吐司的线程来破解。这是有效的(运行吐司10秒，修改睡眠和ctr到你的喜欢):

final Toast toast = Toast.makeText(this, "Your Message", Toast.LENGTH_LONG);

Thread t = new Thread(){
    public void run(){
          int ctr = 0;
          try{
               while( ctr<10 ){
                    toast.show();
                    sleep(1000);
                    ctr++;
               }
          } catch (Exception e) {
               Log.e("Error", "", e);
          }
     }
 };
 t.start();

LONG_DELAY吐司显示为3.5秒，SHORT_DELAY吐司显示为2秒。

Toast内部使用INotificationManager并在每次调用Toast.show()时调用它的enqueueToast方法。

使用SHORT_DELAY调用show()两次将再次将同一toast排队。它将显示4秒(2秒+ 2秒)。

类似地，两次使用LONG_DELAY调用show()将再次将同一toast排队。它将显示7秒(3.5秒+ 3.5秒)

正如其他人提到的，Android toast可以是LENGTH_LONG或LENGTH_SHORT。这是没有办法的，你也不应该遵循发布的任何“技巧”。

toast的目的是显示“非必要的”信息，由于它们的持久影响，如果消息的持续时间超过一定的阈值，消息可能会脱离上下文。如果股票吐司被修改，使它们可以显示比LENGTH_LONG更长的时间，消息将在屏幕上停留，直到应用程序的进程终止，因为吐司视图被添加到WindowManager，而不是应用程序中的ViewGroup。我认为这就是硬编码的原因。

如果您确实需要显示toast样式的消息超过3.5秒，我建议构建一个附加到Activity内容的视图，这样当用户退出应用程序时，它就会消失。我的SuperToasts库处理这个问题和许多其他问题，请随意使用它!您很可能对使用SuperActivityToasts感兴趣