将 setDuration() 用于 Toast 时,是否可以设置自定义长度或至少长于Toast.LENGTH_LONG
?
27 回答
如果您深入研究 android 代码,您会发现清楚地表明我们无法更改 Toast 消息的持续时间的行。
NotificationManagerService.scheduleTimeoutLocked() {
...
long delay = immediate ? 0 : (r.duration == Toast.LENGTH_LONG ? LONG_DELAY : SHORT_DELAY);
}
持续时间的默认值是
private static final int LONG_DELAY = 3500; // 3.5 seconds
private static final int SHORT_DELAY = 2000; // 2 seconds
LENGTH_SHORT
和的值LENGTH_LONG
是 0 和 1。这意味着它们被视为标志而不是实际持续时间,因此我认为不可能将持续时间设置为这些值以外的任何值。
如果您想向用户显示更长时间的消息,请考虑使用状态栏通知。当状态栏通知不再相关时,可以通过编程方式取消它们。
您可能想尝试:
for (int i=0; i < 2; i++)
{
Toast.makeText(this, "blah", Toast.LENGTH_LONG).show();
}
时间加倍。如果您指定 3 而不是 2 它将增加三倍的时间..等等。
如果你想Toast
坚持下去,我发现你可以通过反复Timer
打电话来绕过它toast.show()
(每隔一秒左右就应该这样做)。如果 已经显示,则调用show()
不会破坏任何内容Toast
,但会刷新它在屏幕上停留的时间。
我开发了一个自定义 Toast 类,您可以使用它显示 Toast 所需的持续时间(以毫秒为单位)
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);
}
}
}
为此,我编写了一个辅助类。您可以在 github 上查看代码:https ://github.com/quiqueqs/Toast-Expander/blob/master/src/com/thirtymatches/toasted/ToastedActivity.java
这是你如何显示一个 5 秒(或 5000 毫秒)的吐司:
Toast aToast = Toast.makeText(this, "Hello World", Toast.LENGTH_SHORT);
ToastExpander.showFor(aToast, 5000);
我知道我有点晚了,但我接受了 Regis_AG 的回答并将其包装在一个助手类中,效果很好。
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();
}
}
在您的应用程序代码中,只需执行以下操作:
Toaster.makeLongToast("Toasty!", 8000);
LONG_DELAY toast 显示3.5 秒,SHORT_DELAY toast 显示2 秒。
Toast 在内部使用 INotificationManager 并在每次调用 Toast.show() 时调用它的 enqueueToast 方法。
使用 SHORT_DELAY 调用 show() 两次将再次将相同的 toast 排入队列。它将显示4 秒(2 秒 + 2 秒)。
同样,使用 LONG_DELAY 调用 show() 两次将再次将相同的 toast 排入队列。它将显示7 秒(3.5 秒 + 3.5 秒)
我知道答案已经很晚了.. 在查看 android 的 toast 源代码后,我遇到了同样的问题并决定实现我自己的裸骨 Toast 版本。
基本上,您需要创建一个新的窗口管理器,并使用处理程序在所需的持续时间内显示和隐藏窗口
//Create your handler
Handler mHandler = new Handler();
//Custom Toast Layout
mLayout = layoutInflater.inflate(R.layout.customtoast, null);
//Initialisation
mWindowManager = (WindowManager) context.getApplicationContext()
.getSystemService(Context.WINDOW_SERVICE);
WindowManager.LayoutParams params = new WindowManager.LayoutParams();
params.gravity = Gravity.BOTTOM
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 = PixelFormat.TRANSLUCENT;
params.windowAnimations = android.R.style.Animation_Toast;
params.type = WindowManager.LayoutParams.TYPE_TOAST;
布局初始化后,您可以使用自己的隐藏和显示方法
public void handleShow() {
mWindowManager.addView(mLayout, mParams);
}
public void handleHide() {
if (mLayout != null) {
if (mLayout.getParent() != null) {
mWindowManager.removeView(mLayout);
}
mLayout = null;
}
现在你只需要添加两个可运行的线程,它们调用你可以发布到处理程序的handleShow() 和handleHide()。
Runnable toastShowRunnable = new Runnable() {
public void run() {
handleShow();
}
};
Runnable toastHideRunnable = new Runnable() {
public void run() {
handleHide();
}
};
最后一部分
public void show() {
mHandler.post(toastShowRunnable);
//The duration that you want
mHandler.postDelayed(toastHideRunnable, mDuration);
}
这是一个快速而肮脏的实现。没有考虑任何性能。
这是我使用上述代码制作的自定义 Toast 类:
import android.content.Context;
import android.os.CountDownTimer;
import android.widget.Toast;
public class CustomToast extends Toast {
int mDuration;
boolean mShowing = false;
public CustomToast(Context context) {
super(context);
mDuration = 2;
}
/**
* Set the time to show the toast for (in seconds)
* @param seconds Seconds to display the toast
*/
@Override
public void setDuration(int seconds) {
super.setDuration(LENGTH_SHORT);
if(seconds < 2) seconds = 2; //Minimum
mDuration = seconds;
}
/**
* Show the toast for the given time
*/
@Override
public void show() {
super.show();
if(mShowing) return;
mShowing = true;
final Toast thisToast = this;
new CountDownTimer((mDuration-2)*1000, 1000)
{
public void onTick(long millisUntilFinished) {thisToast.show();}
public void onFinish() {thisToast.show(); mShowing = false;}
}.start();
}
}
正如其他人提到的,Android Toast 可以是 LENGTH_LONG 或 LENGTH_SHORT。没有办法解决这个问题,您也不应该遵循任何发布的“黑客”。
Toast 的目的是显示“非必要”信息,并且由于其挥之不去的效果,如果消息的持续时间超过某个阈值,则消息可能会远离上下文。如果修改了库存 Toast 以使其显示时间超过 LENGTH_LONG,则消息将一直停留在屏幕上,直到应用程序的进程终止,因为 toast 视图被添加到 WindowManager 而不是应用程序中的 ViewGroup。我认为这就是为什么它是硬编码的。
如果您绝对需要显示超过三秒半的 toast 样式消息,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库处理了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
如果您需要较长的 Toast,有一个实用的替代方案,但它需要您的用户单击 OK 按钮才能使其消失。您可以像这样使用 AlertDialog:
String message = "This is your message";
new AlertDialog.Builder(YourActivityName.this)
.setTitle("Optional Title (you can omit this)")
.setMessage(message)
.setPositiveButton("ok", null)
.show();
如果您的消息很长,很可能您不知道用户阅读该消息需要多长时间,因此有时要求您的用户单击“确定”按钮以继续是个好主意。就我而言,当用户单击帮助图标时,我会使用此技术。
只需使用SuperToast即可在任何情况下做出优雅的吐司。让你的吐司多姿多彩。编辑你的字体颜色和它的大小。希望这一切都为您服务。
为什么要吃 Toast,当你可以拥有整个Snackbar时:https ://developer.android.com/reference/android/support/design/widget/Snackbar.html
小吃店 > 吐司、定制吐司、面包块
不,这里列出的大多数/所有黑客都不再适用于 android 9。但是有一个更好的解决方案:如果您的消息需要闲逛,请使用对话框。
(new AlertDialog.Builder(this)).setTitle("Sorry!")
.setMessage("Please let me know by posting a beta comment on the play store .")
.setPositiveButton("OK", null).create().show();
用户无法自定义 Toast 的持续时间。因为 NotificationManagerService 的 scheduleTimeoutLocked() 函数不使用字段持续时间。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);
}
使用 Crouton,它是一个非常灵活的 Toast 库。
你可以像 toasts 一样使用它:
Crouton.makeText(context, "YOUR_MESSAGE", Style.INFO);
或者你甚至可以更深入地定制它,比如将时间设置为无限!例如,在这里我想显示一条 toast 消息,直到用户通过单击它来确认它。
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;
}
将为吐司充气的自定义布局。
<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>
Toast 持续时间可以使用专门运行 toast 的线程来破解。这有效(运行 toast 10 秒,根据自己的喜好修改sleep和ctr ):
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();
具有自定义背景和视图的吐司对我有用。我在 nexus 7 平板电脑上对其进行了测试,我注意到循环期间没有淡入淡出动画。下面是实现:
public static void customToast(Context context, String message, int duration) {
for (int i = 0; i < duration; i++) {
Toast toast = new Toast(context);
toast.setDuration(Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER, 0, 0);
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.toast_layout, null);
TextView textViewToast = (TextView) view
.findViewById(R.id.textViewToast);
textViewToast.setText(message);
toast.setView(view);
toast.show();
}
}
这是上面代码中使用的自定义文本视图:
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/textViewToast"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/fragment_background"
android:padding="8dp"
android:text="Large Text"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="@color/blue" />
@drawable/fragment_background 让我的吐司像 kitkat 版本一样变成圆角。您也可以在文件中添加其他视图。鼓励任何改进和评论的修改,因为我计划在我的实时应用程序中实现这一点。
将倒计时安排到未来的某个时间,并在此期间定期通知。在文本字段中显示 30 秒倒计时的示例:
新的倒计时(30000,1000){ 公共无效onTick(长millisUntilFinished){ mTextField.setText("剩余秒数:" + millisUntilFinished / 1000); } 公共无效 onFinish() { mTextField.setText("完成!"); } }。开始();
该文本将在 5 秒后消失。
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,它将显示大约 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();
在所有可用的解决方案都失败后,我终于有了使用递归的解决方法。
代码:
//Recursive function, pass duration in seconds
public void showToast(int duration) {
if (duration <= 0)
return;
Toast.makeText(this, "Hello, it's a toast", Toast.LENGTH_LONG).show();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
showToast(duration-1);
}
}, 1000);
}
创建稍长消息的一种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);
}
}
请注意,上面的示例消除了 LENGTH_SHORT 选项以保持示例简单。
您通常不希望使用 Toast 消息以很长的时间间隔显示消息,因为这不是 Toast 类的预期用途。但是有时您需要显示的文本量可能需要用户超过 3.5 秒才能阅读,在这种情况下,稍微延长时间(例如,如上所示,延长至 6.5 秒)可能,IMO,很有用并与预期用途一致。
将 toast 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);
}
}
}
private Toast mToastToShow;
public void showToast(View view) {
// Set the toast and duration
int toastDurationInMilliSeconds = 10000;
mToastToShow = Toast.makeText(this, "Hello world, I am a toast.", Toast.LENGTH_LONG);
// Set the countdown to display the toast
CountDownTimer toastCountDown;
toastCountDown = new CountDownTimer(toastDurationInMilliSeconds, 1000 /*Tick duration*/) {
public void onTick(long millisUntilFinished) {
mToastToShow.show();
}
public void onFinish() {
mToastToShow.cancel();
}
};
// Show the toast and starts the countdown
mToastToShow.show();
toastCountDown.start();
}
val toast = Toast.makeText(this, "", Toast.LENGTH_LONG)
val countDownTimer = object : CountDownTimer(5000, 1000) {
override fun onTick(millisUntilFinished: Long) { }
override fun onFinish() { toast.cancel() }
}
toast.show()
countDownTimer.start()
Toast.makeText(this, "Text", Toast.LENGTH_LONG).show();
Toast.makeText(this, "Text", Toast.LENGTH_LONG).show();
这个问题的一个非常简单的解决方案。他们的两倍或三倍将使吐司持续更长时间。这是唯一的方法。