4.3 Toast的使用

package com.chaowen;import android.app.Activity;import android.os.Bundle;import android.text.Editable;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.Toast;public class Ex04_03_Toast extends Activity {    /** Called when the activity is first created. */private TextView mTextView;private EditText mEditText;private Button button;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mTextView=(TextView)findViewById(R.id.myTextView);        mEditText=(EditText)findViewById(R.id.myEditText);        button=(Button)findViewById(R.id.myButton);                button.setOnClickListener(new Button.OnClickListener(){@Overridepublic void onClick(View v) {      //声明字符串变量并取得用户输入的EditText字符串Editable str;str=mEditText.getText();//使用系统标准的makeText方式来产生Toast信息Toast.makeText(Ex04_03_Toast.this, "你的愿望"+str.toString()+"已经送给圣诞老人的信箱", Toast.LENGTH_LONG).show();}                });    }}