点击回车搜索

<EditText
    android:id="@+id/city"
    android:imeOptions="actionSearch"
    android:singleLine="true"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />

<Button
    android:id="@+id/search"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:text="搜索" />

edit = (EditText) findViewById(R.id.edit);
search = (Button) findViewById(R.id.search);

city.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if (keyCode == KeyEvent.KEYCODE_ENTER) {//重写回车键
                    search();
                }
                return false;//这里很好玩，你把false改成true试试，你会发现其他按键会被拦截
            }
        });
getWeather.setOnClickListener(new View.OnClickListener() {
     @Override
     public void onClick(View v) {
         search();
     }
 });

//隐藏键盘
public class HideKeyBoard {
    //注意，这里不是构造方法
    public static void HideKeyBoard(Activity activity){
        InputMethodManager inputMethodManager = (InputMethodManager)
                activity.getSystemService(Context.INPUT_METHOD_SERVICE);
        inputMethodManager.hideSoftInputFromWindow(activity.getCurrentFocus()
                .getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
    }
}

public void search(){
        //隐藏键盘
        HideKeyBoard.HideKeyBoard(this);
　　　　　　//....其他搜索内容...
}