/** Called when the user clicks the Send button */
public void sendMessage(View view) {
  // Do something in response to button
}

In order for the system to match this method to the method name given toandroid:onClick, the signature must be exactly as shown. Specifically, the method must:

• Be public //一定是public的方法
• Have a void return value //一定是无返回值的方法
• Have aViewas the only parameter (this will be theViewthat was clicked) //有且只有一个View类型的形参(希望被点到的View)

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