Android提醒方式之Toast

概述

Toast是Android系统提供的一种提醒方式，在程序中可以使用它将一些短小的信息通知给用户，这些信息会在一段时间后自动消失，并且不会占用任何屏幕空间。

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makeText方法的签名及参数介绍

public class Toast {
  public static Toast makeText(Context context, CharSequence text, @Duration int duration)
  //Make a standard toast that just contains a text view.
  //@param context: The context to use
  //@param text: The text to show
  //@param duration: How long to display the message

   public static Toast makeText(Context context, @StringRes int resId, @Duration int duration)  throws Resources.NotFoundException
   //Make a standard toast that just contains a text view with the text from a resource.
   //@param context: The context to use
   //@param resId: The resource id of the string resource to use
   //@param duration: How long to display the message
   //@throw: If the resource can't be found
}

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实例

public class FirstActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_layout);
        Button button1 = (Button) findViewById(R.id.button_1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //通过Toast.makeText方法创建一个Toast对象，然后调用show()将其显示出来
                Toast.makeText(FirstActivity.this, "You click button 1", Toast.LENGTH_SHORT).show();
            }
        });
    }
}

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参考《第一行代码——Android》