A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. For example, navigating away from an email before you send it triggers a "Draft saved" toast to let you know that you can continue editing later. Toasts automatically disappear after a timeout.
創(chuàng)新互聯(lián)公司專注于羅莊網(wǎng)站建設服務及定制,我們擁有豐富的企業(yè)做網(wǎng)站經(jīng)驗。 熱誠為您提供羅莊營銷型網(wǎng)站建設,羅莊網(wǎng)站制作、羅莊網(wǎng)頁設計、羅莊網(wǎng)站官網(wǎng)定制、小程序設計服務,打造羅莊網(wǎng)絡公司原創(chuàng)品牌,更為您提供羅莊網(wǎng)站排名全網(wǎng)營銷落地服務。二、The Basics
First, instantiate a Toast
object with one of the makeText()
methods. This method takes three parameters: the application Context
, the text message, and the duration for the toast. It returns a properly initialized Toast object. You can display the toast notification with show()
, as shown in the following example:
Context context = getApplicationContext();
CharSequence text= "Hello toast!";
int duration = Toast.LENGTH_SHORT;
Toast toast= Toast.makeText(context, text, duration);
toast.show();
This example demonstrates everything you need for most toast notifications. You should rarely need anything else. You may, however, want to position the toast differently or even use your own layout instead of a simple text message. The following sections describe how you can do these things.
You can also chain your methods and avoid holding on to the Toast object, like this:
Toast.makeText(context, text, duration).show();
三、Positioning your Toast
A standard toast notification appears near the bottom of the screen, centered horizontally. You can change this position with the setGravity(int, int, int)
method. This accepts three parameters: aGravity
constant, an x-position offset, and a y-position offset.
For example, if you decide that the toast should appear in the top-left corner, you can set the gravity like this:
toast.setGravity(Gravity.TOP|Gravity.LEFT, 0, 0);
f you want to nudge the position to the right, increase the value of the second parameter. To nudge it down, increase the value of the last parameter.
四、Creating a Custom Toast View
If a simple text message isn't enough, you can create a customized layout for your toast notification. To create a custom layout, define a View layout, in XML or in your application code, and pass the root View
object to the setView(View)
method.
For example, you can create the layout for the toast visible in the screenshot to the right with the following XML (saved as toast_layout.xml):
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toast_layout_root"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="8dp"
android:background="#DAAA" > <ImageViewandroid:src="@drawable/droid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="8dp" /> <TextViewandroid:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#FFF" /></LinearLayout>
Notice that the ID of the LinearLayout element is "toast_layout_root". You must use this ID to inflate the layout from the XML, as shown here:
LayoutInflater inflater = getLayoutInflater();
View layout= inflater.inflate(R.layout.custom_toast,
(ViewGroup) findViewById(R.id.toast_layout_root));
TextView text= (TextView) layout.findViewById(R.id.text);
text.setText("This is a custom toast");
Toast toast= new Toast(getApplicationContext());
toast.setGravity(Gravity.CENTER_VERTICAL,0, 0);
toast.setDuration(Toast.LENGTH_LONG);
toast.setView(layout);
toast.show();
First, retrieve the LayoutInflater
with getLayoutInflater()
(or getSystemService()
), and then inflate the layout from XML using inflate(int, ViewGroup)
. The first parameter is the layout resource ID and the second is the root View. You can use this inflated layout to find more View objects in the layout, so now capture and define the content for the ImageView and TextView elements. Finally, create a new Toast with Toast(Context)
and set some properties of the toast, such as the gravity and duration. Then call setView(View)
and pass it the inflated layout. You can now display the toast with your custom layout by calling show()
.
Note: Do not use the public constructor for a Toast unless you are going to define the layout withsetView(View)
. If you do not have a custom layout to use, you must use makeText(Context, int, int)
to create the Toast.
分享標題:(三)android中Toast的使用-創(chuàng)新互聯(lián)
當前地址:http://vcdvsql.cn/article36/dsddpg.html
成都網(wǎng)站建設公司_創(chuàng)新互聯(lián),為您提供網(wǎng)站導航、動態(tài)網(wǎng)站、商城網(wǎng)站、網(wǎng)站制作、企業(yè)網(wǎng)站制作、網(wǎng)站建設
聲明:本網(wǎng)站發(fā)布的內(nèi)容(圖片、視頻和文字)以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主,如果涉及侵權(quán)請盡快告知,我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場,如需處理請聯(lián)系客服。電話:028-86922220;郵箱:631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載,或轉(zhuǎn)載時需注明來源: 創(chuàng)新互聯(lián)
猜你還喜歡下面的內(nèi)容