主要是掌握怎样在Fragment类型的.java文件中实现对于文本框或者按钮点击事件的触发操作。
相应的出发时间都是之前的代码。主要是怎样在Fragment怎样实现相应的操作主要是对于getActivity()。的相关应用。
对于相关的知识点:
1、
onCreatView是碎片的生命周期中的一种状态,在为碎片创建视图(加载布局)时调用
使用:View view=inflater.inflate(R.layout.right_fragment,container,false);
三个参数的含义及作用
LayoutInflater inflater:作用类似于findViewById(),findViewById()用来寻找xml布局下的具体的控件(Button、TextView等),LayoutInflater inflater()用来找res/layout/下的xml布局文件
ViewGroup container:表示容器,View放在里面(还不理解)
Bundle savedInstanceState:保存当前的状态,在活动的生命周期中,只要离开了可见阶段,活动很可能就会被进程终止,这种机制能保存当时的状态
2、
关于android中onCreateView和onCreate之间的区别
onCreate是指创建该fragment,类似于Activity.onCreate,你可以在其中初始化除了view之外的东西。
onCreateView是创建该fragment对应的视图,你必须在这里创建自己的视图并返回给调用者、
3、
getActivity();来代替context获取他的相应的对象这样在Fragment中好运行点击事件。
主要的两个.java文件的代码如下:
WeixinFragment.java
package com.example.wenandroidcheck11;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.DatePicker;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.TimePicker;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import java.util.Calendar;
public class WeixinFragment extends Fragment implements View.OnClickListener, DatePicker.OnDateChangedListener, TimePicker.OnTimeChangedListener {
private LinearLayout llDate, llTime;
private TextView tvDate, tvTime;
private int year, month, day, hour, minute;
//在TextView上显示的字符
private StringBuffer date, time;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab1, container, false);
llDate = (LinearLayout) view.findViewById(R.id.ll_date);
tvDate = (TextView) view.findViewById(R.id.tv_date);
llTime = (LinearLayout) view.findViewById(R.id.ll_time);
tvTime = (TextView)view.findViewById(R.id.tv_time);
llDate.setOnClickListener(this);
llTime.setOnClickListener(this);
date = new StringBuffer();
time = new StringBuffer();
initDateTime();
return view;
}
/**
* 获取当前的日期和时间
*/
private void initDateTime() {
Calendar calendar = Calendar.getInstance();
year = calendar.get(Calendar.YEAR);
month = calendar.get(Calendar.MONTH)+1;
day = calendar.get(Calendar.DAY_OF_MONTH);
hour = calendar.get(Calendar.HOUR);
minute = calendar.get(Calendar.MINUTE);
}
@Override
public void onClick (View v){
switch (v.getId()) {
case R.id.ll_date:
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setPositiveButton("设置", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (date.length() > 0) { //清除上次记录的日期
date.delete(0, date.length());
}
month += 1;
tvDate.setText(date.append(String.valueOf(year)).append("年").append(String.valueOf(month)).append("月").append(day).append("日"));
dialog.dismiss();//取消对话框的作用
}
});
builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
final AlertDialog dialog = builder.create();//创建对话框
View dialogView = View.inflate(getActivity(), R.layout.dialog_date, null);
/*这个方法可以得到view,但是对view中设置居中等什么属性都是无效的,还有就是设置的宽度也是无效的,默认只能是wrap*/
final DatePicker datePicker = (DatePicker) dialogView.findViewById(R.id.datePicker);
dialog.setTitle("设置日期");
dialog.setView(dialogView);//可以通过自定义一个View,设计成自己想要的不同的dialog,(会话)
dialog.show();//显示对话框
//初始化日期监听事件
datePicker.init(year, month - 1, day, this);
break;
case R.id.ll_time:
AlertDialog.Builder builder2 = new AlertDialog.Builder(getActivity());
builder2.setPositiveButton("设置", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (time.length() > 0) { //清除上次记录的日期
time.delete(0, time.length());
}
tvTime.setText(time.append(String.valueOf(hour)).append("时").append(String.valueOf(minute)).append("分"));
dialog.dismiss();
}
});
builder2.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog dialog2 = builder2.create();
View dialogView2 = View.inflate(getActivity(), R.layout.dialog_time, null);
TimePicker timePicker = (TimePicker) dialogView2.findViewById(R.id.timePicker);
timePicker.setCurrentHour(hour);
timePicker.setCurrentMinute(minute);
timePicker.setIs24HourView(true); //设置24小时制
timePicker.setOnTimeChangedListener(this);
dialog2.setTitle("设置时间");
dialog2.setView(dialogView2);
dialog2.show();
break;
}
/**
* 日期改变的监听事件
*
* @param view
* @param year
* @param monthOfYear
* @param dayOfMonth
*/
}
@Override
public void onDateChanged (DatePicker view,int year, int monthOfYear, int dayOfMonth){
this.year = year;
this.month = monthOfYear;
this.day = dayOfMonth;
}
/**
* 时间改变的监听事件
*
* @param view
* @param hourOfDay
* @param minute
*/
@Override
public void onTimeChanged (TimePicker view,int hourOfDay, int minute){
this.hour = hourOfDay;
this.minute = minute;
}
}
Frdfragment.java
package com.example.wenandroidcheck11;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
public class FrdFragment extends Fragment implements View.OnClickListener{
private Button btn_register;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab2, container, false);
btn_register =(Button) view.findViewById(R.id.button_register);
btn_register.setOnClickListener(this);
return view;
}
@Override
public void onClick(View view){
//String text = "csdnicjbsndicnsdicnsojdn";
//Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getActivity(),RegisterActivity1.class);
startActivity(intent);
}
}
这样实现在tap中界面中按钮的触发时间。并且实现界面的跳转。
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