android用户界面-提示信息Toast

在程序中创建toast的步骤说明如下

1、调用toast的静态方法makeText()添加现实文本和时长。

2、调用toast的show()显示。

实例如下：

/Chapter04_UI_Toast/src/com/amaker/test/MainActivity.java

代码

                            package           com.amaker.test;

          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 {
           /**           Called when the activity is first created.           */          
           private           Button b1,b2;
 @Override
           public                     void           onCreate(Bundle savedInstanceState) {
           super          .onCreate(savedInstanceState);
 setContentView(R.layout.main);
 b1           =           (Button)findViewById(R.id.Button01);
 b2           =           (Button)findViewById(R.id.Button02);
 
           final                     int           l           =           Toast.LENGTH_LONG;
           final                     int           s           =           Toast.LENGTH_SHORT;
           final           String s1           =                     "          我多显示一会儿！          "          ;
           final           String s2           =                     "          我少显示一会儿！          "          ;
 
 b1.setOnClickListener(          new           OnClickListener() {
           public                     void           onClick(View v) {
 Toast t1           =           Toast.makeText(getApplicationContext(), s1, l);
 t1.show();
 }
 });
 
 b2.setOnClickListener(          new           OnClickListener() {
           public                     void           onClick(View v) {
 Toast t2           =           Toast.makeText(getApplicationContext(), s2, s);
 t2.show();
 }
 });
 
 }
}

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