User Interface 之自定义Toast

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/toast_layout_root"
              xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:orientation="vertical">
    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/cover"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="I am a custom toast"
        android:textSize="20sp"
        android:typeface="monospace"/>
</LinearLayout>

package com.panjn.userinterface;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View toastView = getLayoutInflater().inflate(R.layout.toast_layout,(ViewGroup)findViewById(R.id.toast_layout_root));
        Toast toast = new Toast(getApplicationContext());
//        toast.setText("Hello Minions");    //不能调用setText(String text), 否则抛出异常
        toast.setView(toastView);
        toast.setDuration(Toast.LENGTH_LONG);
        //params: int gravity, int xOffset, int yOffset
        toast.setGravity(Gravity.CENTER,0,0);
        toast.show();
    }
}