本文主要记录了关于fragment的四种跳转方式:
1、从同一个Activiy的一个Fragment跳转到另外一个Fragment
2、从一个Activity的Fragment跳转到另外一个Activity
3、从一个Activity跳转到另外一个Activity的Fragment上
4、从一个Activity的Fragment跳转到另外一个Activity的Fragment上
写这篇文章只是一个简单的记录,当初我学这里的时候看别人的文章总是觉得云里雾里的,后来自己也觉得差不多可以了,于是写下这篇博客,也是记录自己的学习过程。
首先新建一个项目,然后新建两个活动MainActivity、OtherActivity。
在MainActivity的布局文件中写一个子布局:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
-
- <FrameLayout
- android:id="@+id/fragment_container"
- android:layout_width="match_parent"
- android:layout_height="0dp"
- android:layout_weight="1"/>
-
-
- LinearLayout>
新建一个my_fragment.xml布局与MyFragment类
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="MyFragment"
- android:textSize="40sp"
- android:gravity="center_horizontal"/>
-
- <Button
- android:id="@+id/my_button"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textAllCaps="false"
- android:text="To YourFragment"/>
-
- <Button
- android:id="@+id/my_other"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textAllCaps="false"
- android:text="To OtherActivity"/>
-
- LinearLayout>
MyFragment类就暂时省略了,后面会贴出所有代码。
在MainActivity中先添加进一个Fragment进行最开始的展示(压栈式添加)
- public class MainActivity extends AppCompatActivity {
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container,new MyFragment())
- .addToBackStack(null)
- .commit();
-
- }
- }
这个跳转与上面初始显示Fragment类似。
新建your_fragment.xml布局与YourFragment类。
- public class YourFragment extends Fragment {
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View contentView;
- contentView = inflater.inflate(R.layout.your_fragment, container, false);
- return contentView;
- }
-
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- Button myReturn = (Button) getActivity().findViewById(R.id.my_return);
- myReturn.setOnClickListener(new View.OnClickListener() {
- //返回到上一个Fragment(同一个Activity中)
- @Override
- public void onClick(View v) {
- getActivity().getSupportFragmentManager().popBackStack();
- }
- });
- }
- }
your_fragment.xml就暂时先省略了,最后会贴出全部代码。
跳转部分代码如下,通过点击按钮跳转:
- myButton.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- /** 一、从同一个Activity的一个Fragment跳到另外一个Fragment*/
- //压栈式跳转
- getActivity().getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container, new YourFragment(), null)
- .addToBackStack(null)
- .commit();
-
- }
- });
此跳转与Activity之间的跳转十分相似,只要引用上下文的时候,改成getActivity()即可。
跳转关键代码:
- myOther.setOnClickListener(new View.OnClickListener() {
- /**
- 二、从一个Activity的Fragment跳转到另外一个Activity(等同于Activity之间的跳转(上下文是getActivity))
- */
- @Override
- public void onClick(View v) {
- Intent intent = new Intent(getActivity(),OtherActivity.class);
- startActivity(intent);
- }
- });
我们要从OtherActivity跳转到MainActivity的YourFragment上去:
首先,我们在OtherActivity中的跳转事件中给MainActivity传递一个参数,命名为id:
- Intent intent = new Intent(OtherActivity.this, MainActivity.class);
- intent.putExtra("id",1);
- startActivity(intent);
然后,我们在MainActivity里接收id值,对值进行判断,如果正确进行跳转操作:
- int id = getIntent().getIntExtra("id", 0);
- if (id == 1) {
- getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container,new YourFragment())
- .addToBackStack(null)
- .commit();
- }
从一个Activity的Fragment跳转到另外一个Activity的Fragment上
新建other_fragment.xml布局作为OtherActivity的一个Fragment。
这种跳转与第三种跳转极为类似,我们只需要将上面的
Intent intent = new Intent(OtherActivity.this, MainActivity.class);
书写在对应的Fragment中,将OtherActivity.this更改为getActivity(),其他不用改变,就能完成跳转。
关键代码如下:
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- Button ToButton = (Button) getActivity().findViewById(R.id.to_button);
- ToButton.setOnClickListener(new View.OnClickListener() {
-
- @Override
- public void onClick(View v) {
- Intent intent = new Intent(getActivity(), MainActivity.class);
- intent.putExtra("id",1);
- startActivity(intent);
- }
- });
- }
最后附上所有的代码文件。
MainActivity:
- package com.example.fragment_activity_skiptest;
-
- import android.content.Intent;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
-
- public class MainActivity extends AppCompatActivity {
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container,new MyFragment())
- .addToBackStack(null)
- .commit();
- int id = getIntent().getIntExtra("id", 0);
- if (id == 1) {
- getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container,new YourFragment())
- .addToBackStack(null)
- .commit();
- }
-
- }
- }
MyFragment:
- package com.example.fragment_activity_skiptest;
-
- import android.content.Intent;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.Button;
-
-
- public class MyFragment extends Fragment {
-
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View contentView;
- contentView = inflater.inflate(R.layout.my_fragment, container, false);
-
- return contentView;
- }
-
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- Button myButton = (Button) getActivity().findViewById(R.id.my_button);
-
- Button myOther = (Button) getActivity().findViewById(R.id.my_other);
- myButton.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- /** 一、从同一个Activity的一个Fragment跳到另外一个Fragment*/
- //压栈式跳转
- getActivity().getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.fragment_container, new YourFragment(), null)
- .addToBackStack(null)
- .commit();
-
- }
- });
- myOther.setOnClickListener(new View.OnClickListener() {
- /**
- 二、从一个Activity的Fragment跳转到另外一个Activity(等同于Activity之间的跳转(上下文是getActivity))
- */
- @Override
- public void onClick(View v) {
- Intent intent = new Intent(getActivity(),OtherActivity.class);
- startActivity(intent);
- }
- });
- }
- }
OtherActivity:
- package com.example.fragment_activity_skiptest;
-
- import android.content.Intent;
- import android.support.v7.app.AppCompatActivity;
- import android.os.Bundle;
- import android.view.View;
- import android.widget.Button;
-
- public class OtherActivity extends AppCompatActivity {
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_other);
- Button button = (Button)findViewById(R.id.to_MainActivity_YourFragment);
- Button button_back = (Button)findViewById(R.id.back);
- Button button_fm = (Button)findViewById(R.id.to_OtherFragment);
- button.setOnClickListener(new View.OnClickListener() {
- /*从一个Activity跳转到另外一个Activity的Fragment上
- 例如我们要从OtherActivity跳转到MainActivity的YourFragment上去:
- 首先,我们在OtherActivity中的跳转事件中给MainActivity传递一个名为id的参数:
- 然后,我们在MainActivity里接收id值,对值进行判断,如果正确进行跳转操作:
- */
- @Override
- public void onClick(View v) {
- Intent intent = new Intent(OtherActivity.this, MainActivity.class);
- intent.putExtra("id",1);
- startActivity(intent);
-
- }
- });
- button_back.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- finish();
- }
- });
- button_fm.setOnClickListener(new View.OnClickListener() {
- @Override
- public void onClick(View v) {
- getSupportFragmentManager()
- .beginTransaction()
- .replace(R.id.frame_container, new OtherFragment(), null)
- .addToBackStack(null)
- .commit();
- }
- });
- }
- }
OtherFragment:
- package com.example.fragment_activity_skiptest;
-
- import android.content.Intent;
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.Button;
-
-
- public class OtherFragment extends Fragment {
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View contentView;
- contentView = inflater.inflate(R.layout.other_fragment, container, false);
- return contentView;
- }
-
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- Button ToButton = (Button) getActivity().findViewById(R.id.to_button);
- ToButton.setOnClickListener(new View.OnClickListener() {
- /*4、从一个Activity的Fragment跳转到另外一个Activity的Fragment上
- 这种跳转与第三种跳转极为类似,我们只需要将
- Intent intent = new Intent(OtherActivity.this, MainActivity.class);
- 书写在对应的Fragment中,将OtherActivity.this更改为getActivity(),其他不用改变,几个完成跳转.
- */
- @Override
- public void onClick(View v) {
- Intent intent = new Intent(getActivity(), MainActivity.class);
- intent.putExtra("id",1);
- startActivity(intent);
- }
- });
- }
- }
YourFragment:
- package com.example.fragment_activity_skiptest;
-
- import android.os.Bundle;
- import android.support.annotation.Nullable;
- import android.support.v4.app.Fragment;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.widget.Button;
-
-
- public class YourFragment extends Fragment {
- public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
- View contentView;
- contentView = inflater.inflate(R.layout.your_fragment, container, false);
- return contentView;
- }
-
- @Override
- public void onActivityCreated(@Nullable Bundle savedInstanceState) {
- super.onActivityCreated(savedInstanceState);
- Button myReturn = (Button) getActivity().findViewById(R.id.my_return);
- myReturn.setOnClickListener(new View.OnClickListener() {
- //返回到上一个Fragment(同一个Activity中)
- @Override
- public void onClick(View v) {
- getActivity().getSupportFragmentManager().popBackStack();
- }
- });
- }
- }
activity_main.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
-
- <FrameLayout
- android:id="@+id/fragment_container"
- android:layout_width="match_parent"
- android:layout_height="0dp"
- android:layout_weight="1"/>
-
-
- LinearLayout>
activity_other.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:id="@+id/activity_other"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#d0ff05"
- >
-
- <FrameLayout
- android:id="@+id/frame_container"
- android:layout_width="match_parent"
- android:layout_height="0dp"
- android:layout_weight="1">
- <LinearLayout
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="OtherActivity"
- android:textSize="50sp"
- android:gravity="center_horizontal"/>
-
- <Button
- android:id="@+id/to_MainActivity_YourFragment"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="To MainActivity YourFragment"
- android:textAllCaps="false"/>
-
- <Button
- android:id="@+id/to_OtherFragment"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="To OtherFragment"
- android:textAllCaps="false"/>
-
- <Button
- android:id="@+id/back"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="back"/>
-
- LinearLayout>
- FrameLayout>
-
-
-
- LinearLayout>
my_fragment.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent">
-
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="MyFragment"
- android:textSize="40sp"
- android:gravity="center_horizontal"/>
-
- <Button
- android:id="@+id/my_button"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textAllCaps="false"
- android:text="To YourFragment"/>
-
- <Button
- android:id="@+id/my_other"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textAllCaps="false"
- android:text="To OtherActivity"/>
-
- LinearLayout>
other_fragment.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#ffffff">
-
-
-
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:text="OtherFragment"
- android:textSize="40sp"
- android:gravity="center_horizontal"/>
-
- <Button
- android:id="@+id/to_button"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:textAllCaps="false"
- android:text="To MainActivity YourFragment"/>
-
- LinearLayout>
your_fragment.xml:
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="match_parent"
- android:layout_height="match_parent"
- android:background="#0fa345">
-
- <TextView
- android:layout_width="match_parent"
- android:layout_height="wrap_content"
- android:gravity="center_horizontal"
- android:textSize="40sp"
- android:text="YourFragment"/>
-
- <Button
- android:id="@+id/my_return"
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:text="RETURN"
- />
-
- LinearLayout>