android中toast的应用：
本程序实现了用户点击按钮，桌面显示用户在程序中设定好的提示信息
package com.dou.button.activity; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { private Button btn1 =null; private Button btn2 =null; @Override public void onCreate(BundlesavedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //确定按钮的操作代码 btn1 =(Button)findViewById(R.id.btn1); btn1.setOnClickListener(newOnClickListener() { public voidonClick(View v) { Toast.makeText(MainActivity.this,"你点击了确定按钮",Toast.LENGTH_LONG ).show(); } }); //推出按钮的操作代码 btn2 =(Button)findViewById(R.id.btn2); btn2.setOnClickListener(newOnClickListener() { public voidonClick(View v) { Toast.makeText(MainActivity.this,"你点击了退出按钮", Toast.LENGTH_LONG).show(); } }); } }
注：当有多个按钮时以上代码会显得冗余，可以进行修改，修改完成后的代码为以下
package com.dou.button.activity; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { private Button btn1 = null; private Button btn2 = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //确定按钮的操作代码 btn1 = (Button)findViewById(R.id.btn1); btn2 = (Button)findViewById(R.id.btn2); btn1.setOnClickListener(listener); btn2.setOnClickListener(listener); } private OnClickListener listener = new OnClickListener() { public void onClick(View v) { Button btn = (Button)v; switch(btn.getId()) { case R.id.btn1: Toast.makeText(MainActivity.this, "你点击了确定按钮",Toast.LENGTH_LONG).show(); break; case R.id.btn2: Toast.makeText(MainActivity.this, "你点击了退出按钮",Toast.LENGTH_LONG).show(); break; } } };
