Toast对象的使用

package com.wzc.ex03;

import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private Button mButton;
    private EditText mEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mButton = (Button) findViewById(R.id.button1);
        mEditText = (EditText) findViewById(R.id.editText1);

        mButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                /*声明字符串变量并取得用户输入的EditText字符串*/
                Editable Str;
                Str = mEditText.getText();

                Toast.makeText(
                        MainActivity.this,
                        "你的愿望 "+Str.toString()+"已送达圣诞老人信箱",
                        Toast.LENGTH_LONG).show();
                /*清空EditText*/
                mEditText.setText("");

            }
        });
    }
}