As for Toast, I'm sure you are familiar with it. Here's a summary. There are five ways to use Toast:

1. Default style
2. Custom location
3. Custom picture
4. Fully custom layout
5. Use in other threads

All right, no more nonsense, just look at the code

1. first, add 5 buttons in the activity.xml file to click the event to pop up the Toast

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <Button
        android:id= "@+id/default_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "@string/default_button"
        android:textAllCaps="false"/>

    <Button
        android:id= "@+id/custom_position"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "@string/custom_position"
        android:textAllCaps="false"/>

    <Button
        android:id= "@+id/custom_picture"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "@string/custom_picture"
        android:textAllCaps="false"/>

    <Button
        android:id= "@+id/custom"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "@string/custom"
        android:textAllCaps="false"/>

    <Button
        android:id= "@+id/otherthread"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "@string/otherthread"
        android:textAllCaps="false"/>

</LinearLayout>

2. Here I define the strings in the values/strings file, which is convenient to localize the application. Although it is not necessary for the time being, it is good to develop good habits

<resources>
    <string name="app_name">ToastTest</string>
    <string name="default_button">Default</string>
    <string name="custom_position">Custom Position</string>
    <string name="custom_picture">Custom Picture</string>
    <string name="custom">Custom</string>
    <string name="otherthread">OtherThread</string>
</resources>

3. Then the button item.xml file is used to completely customize the layout style of Toast. Here I use a CardView, which needs to add dependency

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/custom_layout"
    app:cardCornerRadius="5dp"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#CDC9C9">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id= "@+id/custom_layout_text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"/>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation = "horizontal">

            <ImageView
                android:id="@+id/custom_layout_image1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding= "10dp"/>

            <ImageView
                android:id="@+id/custom_layout_image2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding= "10dp"/>

        </LinearLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

5. Finally, get the instance of the button in the activity, register and click the event, and the corresponding Toast will pop up

First, the default style

Button default_button = (Button) findViewById(R.id.default_button);
default_button.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View v){
        //The static method makeText(), the first parameter is context, which is the context of the activity, the second parameter is the text content displayed by Toast, and the third parameter is the display time, which has Toast.LENGTH_LONG and  Toast.LENGTH_SHORT
        Toast.makeText(MainActivity.this, R.string.default_button, Toast.LENGTH_SHORT).show();
    }
});

The results are as follows:

Then the custom location

Button custom_position = (Button) findViewById(R.id.custom_position);
custom_position.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View v){
        Toast toast = Toast.makeText(MainActivity.this, R.string.custom_position, Toast.LENGTH_SHORT);
        //Use setGravity() method to set the position of Toast on the screen. The first parameter sets the gravity position, including TOP. BOTTOM. START and END equivalent. The second and third parameters are used for offset in horizontal and vertical directions  
        toast.setGravity(Gravity.TOP, 10, 10);
        toast.show();
    }
});

Then customize the picture

Button custom_picture = (Button) findViewById(R.id.custom_picture);
custom_picture.setOnClickListener(new View.OnClickListener(){
     @Override
     public void onClick(View view){
         Toast toast = Toast.makeText(MainActivity.this, R.string.custom_picture, Toast.LENGTH_SHORT);
         toast.setGravity(Gravity.TOP, 10, 10);

         //Get the View of Toast using getView() method
         LinearLayout toastView = (LinearLayout) toast.getView();
         ImageView imageView = new ImageView(getApplicationContext());
         imageView.setImageResource(R.drawable.ic_launcher_foreground);

         toastView.setOrientation(LinearLayout.HORIZONTAL);
         //The addView() method of ViewGroup is used to add child views. The first parameter is the View to be added, and the second is the location to be added
         toastView.addView(imageView, 1);

         toast.show();
     }
 });

Results:

And then there's the full customization

Button custom = (Button) findViewById(R.id.custom);
custom.setOnClickListener(new View.OnClickListener(){
     @Override
     public void onClick(View v){
         Toast toast = Toast.makeText(MainActivity.this, R.string.custom, Toast.LENGTH_SHORT);

         //First load the defined Toast layout
         View custom_layout = getLayoutInflater().inflate(R.layout.button_item, (ViewGroup) findViewById(R.id.custom_layout), false);

         //Then set the text. Picture in the layout file
         TextView custom_layout_text = custom_layout.findViewById(R.id.custom_layout_text);
         custom_layout_text.setText(R.string.custom);
         ImageView custom_layout_image1 = custom_layout.findViewById(R.id.custom_layout_image1);
         custom_layout_image1.setImageResource(R.drawable.ic_launcher_foreground);
         ImageView custom_layout_image2 = custom_layout.findViewById(R.id.custom_layout_image2);
         custom_layout_image2.setImageResource(R.drawable.ic_launcher_background);

         toast.setGravity(Gravity.TOP, 10, 10);
         toast.setDuration(Toast.LENGTH_SHORT);

         //setView() method to set the View of Toast
         toast.setView(custom_layout);
         toast.show();
     }
});

Results:

Next, Toast is used in other threads, where asynchronous message processing is used

final Handler handler = new Handler(){
    @Override
    public void handleMessage(Message message){
        switch(message.what){
            case 1:
                showToast();
                break;
            default:
                break;
        }
    }
};

void showToast(){
      Toast.makeText(MainActivity.this, R.string.otherthread, Toast.LENGTH_SHORT).show();
}

Button otherThread = (Button) findViewById(R.id.otherthread);
otherThread.setOnClickListener(new View.OnClickListener(){
    @Override
    public void onClick(View v){
        new Thread(new Runnable() {
            @Override
            public void run() {
                Message message = new Message();
                message.what =1;
                handler.sendMessage(message);
            }
        }).start();
    }
});

Results:

6. Write at the end

Well, these are the five usages of Toast. If there is any mistake or suggestion, you are welcome to criticize and correct.

reference material: http://www.jb51.net/article/101948.htm