Fragment的四种跳转方式
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Activity3、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：
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent">
6
7
8 <FrameLayout
9 android:id="@+id/fragment_container"
10 android:layout_width="match_parent"
11 android:layout_height="0dp"
12 android:layout_weight="1"/>
13
14
15 </LinearLayout>新建一个my_fragment.xml布局与MyFragment类
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent">
6
7 <TextView
8 android:layout_width="match_parent"
9 android:layout_height="wrap_content"
10 android:text="MyFragment"
11 android:textSize="40sp"
12 android:gravity="center_horizontal"/>
13
14 <Button
15 android:id="@+id/my_button"
16 android:layout_width="wrap_content"
17 android:layout_height="wrap_content"
18 android:textAllCaps="false"
19 android:text="To YourFragment"/>
20
21 <Button
22 android:id="@+id/my_other"
23 android:layout_width="wrap_content"
24 android:layout_height="wrap_content"
25 android:textAllCaps="false"
26 android:text="To OtherActivity"/>
27
28 </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）
1 public class MainActivity extends AppCompatActivity {
2
3 @Override
4 protected void onCreate(Bundle savedInstanceState) {
5 super.onCreate(savedInstanceState);
6 setContentView(R.layout.activity_main);
7 getSupportFragmentManager()
8 .beginTransaction()
9 .replace(R.id.fragment_container,new MyFragment())
10 .addToBackStack(null)
11 .commit();
12
13 }
14 }从同一个Activiy的一个Fragment跳转到另外一个Fragment
这个跳转与上面初始显示Fragment类似。
新建your_fragment.xml布局与YourFragment类。
1 public class YourFragment extends Fragment {
2 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
3 View contentView;
4 contentView = inflater.inflate(R.layout.your_fragment, container, false);
5 return contentView;
6 }
7
8 @Override
9 public void onActivityCreated(@Nullable Bundle savedInstanceState) {
10 super.onActivityCreated(savedInstanceState);
11 Button myReturn = (Button) getActivity().findViewById(R.id.my_return);
12 myReturn.setOnClickListener(new View.OnClickListener() {
13 //返回到上一个Fragment（同一个Activity中）
14 @Override
15 public void onClick(View v) {
16 getActivity().getSupportFragmentManager().popBackStack();
17 }
18 });
19 }
20 }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：
1 myButton.setOnClickListener(new View.OnClickListener() {
2 @Override
3 public void onClick(View v) {
4 /* 一、从同一个Activity的一个Fragment跳到另外一个Fragment*/
5 //压栈式跳转
6 getActivity().getSupportFragmentManager()
7 .beginTransaction()
8 .replace(R.id.fragment_container, new YourFragment(), null)
9 .addToBackStack(null)
10 .commit();
11
12 }
13 });从一个Activity的Fragment跳转到另外一个Activity
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：
1 myOther.setOnClickListener(new View.OnClickListener() {
2 /*
3 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）)
4 */
5 @Override
6 public void onClick(View v) {
7 Intent intent = new Intent(getActivity(),OtherActivity.class);
8 startActivity(intent);
9 }
10 });从一个Activity跳转到另外一个Activity的Fragment上
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：
1 Intent intent = new Intent(OtherActivity.this, MainActivity.class); 2 intent.putExtra("id",1); 3 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：
1 int id = getIntent().getIntExtra("id", 0);
2 if (id == 1) {
3 getSupportFragmentManager()
4 .beginTransaction()
5 .replace(R.id.fragment_container,new YourFragment())
6 .addToBackStack(null)
7 .commit();
8 }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
1 Intent intent = new Intent(OtherActivity.this, MainActivity.class);
Intent intent = new Intent(OtherActivity.this, MainActivity.class);
关键代码如下：
1 public void onActivityCreated(@Nullable Bundle savedInstanceState) {
2 super.onActivityCreated(savedInstanceState);
3 Button ToButton = (Button) getActivity().findViewById(R.id.to_button);
4 ToButton.setOnClickListener(new View.OnClickListener() {
5
6 @Override
7 public void onClick(View v) {
8 Intent intent = new Intent(getActivity(), MainActivity.class);
9 intent.putExtra("id",1);
10 startActivity(intent);
11 }
12 });
13 }所有代码文件
最后附上所有的代码文件。
MainActivity:
1 package com.example.fragment_activity_skiptest;
2
3 import android.content.Intent;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.view.View;
7
8 public class MainActivity extends AppCompatActivity {
9
10 @Override
11 protected void onCreate(Bundle savedInstanceState) {
12 super.onCreate(savedInstanceState);
13 setContentView(R.layout.activity_main);
14 getSupportFragmentManager()
15 .beginTransaction()
16 .replace(R.id.fragment_container,new MyFragment())
17 .addToBackStack(null)
18 .commit();
19 int id = getIntent().getIntExtra("id", 0);
20 if (id == 1) {
21 getSupportFragmentManager()
22 .beginTransaction()
23 .replace(R.id.fragment_container,new YourFragment())
24 .addToBackStack(null)
25 .commit();
26 }
27
28 }
29 }MyFragment:
1 package com.example.fragment_activity_skiptest;
2
3 import android.content.Intent;
4 import android.os.Bundle;
5 import android.support.annotation.Nullable;
6 import android.support.v4.app.Fragment;
7 import android.view.LayoutInflater;
8 import android.view.View;
9 import android.view.ViewGroup;
10 import android.widget.Button;
11
12
13 public class MyFragment extends Fragment {
14
15 public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
16 View contentView;
17 contentView = inflater.inflate(R.layout.my_fragment, container, false);
18
19 return contentView;
20 }
21
22 @Override
23 public void onActivityCreated(@Nullable Bundle savedInstanceState) {
24 super.onActivityCreated(savedInstanceState);
25 Button myButton = (Button) getActivity().findViewById(R.id.my_button);
26
27 Button myOther = (Button) getActivity().findViewById(R.id.my_other);
28 myButton.setOnClickListener(new View.OnClickListener() {
29 @Override
30 public void onClick(View v) {
31 /** 一、从同一个Activity的一个Fragment跳到另外一个Fragment*/
32 //压栈式跳转
33 getActivity().getSupportFragmentManager()
34 .beginTransaction()
35 .replace(R.id.fragment_container, new YourFragment(), null)
36 .addToBackStack(null)
37 .commit();
38
39 }
40 });
41 myOther.setOnClickListener(new View.OnClickListener() {
42 /**
43 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）)
44 */
45 @Override
46 public void onClick(View v) {
47 Intent intent = new Intent(getActivity(),OtherActivity.class);
48 startActivity(intent);
49 }
50 });
51 }
52 }OtherActivity:
1 package com.example.fragment_activity_skiptest;
2
3 import android.content.Intent;
4 import android.support.v7.app.AppCompatActivity;
5 import android.os.Bundle;
6 import android.view.View;
7 import android.widget.Button;
8
9 public class OtherActivity extends AppCompatActivity {
10
11 @Override
12 protected void onCreate(Bundle savedInstanceState) {
13 super.onCreate(savedInstanceState);
14 setContentView(R.layout.activity_other);
15 Button button = (Button)findViewById(R.id.to_MainActivity_YourFragment);
16 Button button_back = (Button)findViewById(R.id.back);
17 Button button_fm = (Button)findViewById(R.id.to_OtherFragment);
18 button.setOnClickListener(new View.OnClickListener() {
19 /*从一个Activity跳转到另外一个Activity的Fragment上
20 例如我们要从OtherActivity跳转到MainActivity的YourFragment上去：
21 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：
22 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：
23 */
24 @Override
25 public void onClick(View v) {
26 Intent intent = new Intent(OtherActivity.this, MainActivity.class);
27 intent.putExtra("id",1);
28 startActivity(intent);
29
30 }
31 });
32 button_back.setOnClickListener(new View.OnClickListener() {
33 @Override
34 public void onClick(View v) {
35 finish();
36 }
37 });
38 button_fm.setOnClickListener(new View.OnClickListener() {
39 @Override
40 public void onClick(View v) {
41 getSupportFragmentManager()
42 .beginTransaction()
43 .replace(R.id.frame_container, new OtherFragment(), null)
44 .addToBackStack(null)
45 .commit();
46 }
47 });
48 }
49 }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:
<?xml version="1.0" encoding="utf-8"?>
<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:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:id="@+id/activity_other"
5 android:layout_width="match_parent"
6 android:layout_height="match_parent"
7 android:background="#d0ff05"
8 >
9
10 <FrameLayout
11 android:id="@+id/frame_container"
12 android:layout_width="match_parent"
13 android:layout_height="0dp"
14 android:layout_weight="1">
15 <LinearLayout
16 android:orientation="vertical"
17 android:layout_width="match_parent"
18 android:layout_height="match_parent">
19
20 <TextView
21 android:layout_width="match_parent"
22 android:layout_height="wrap_content"
23 android:text="OtherActivity"
24 android:textSize="50sp"
25 android:gravity="center_horizontal"/>
26
27 <Button
28 android:id="@+id/to_MainActivity_YourFragment"
29 android:layout_width="wrap_content"
30 android:layout_height="wrap_content"
31 android:text="To MainActivity YourFragment"
32 android:textAllCaps="false"/>
33
34 <Button
35 android:id="@+id/to_OtherFragment"
36 android:layout_width="wrap_content"
37 android:layout_height="wrap_content"
38 android:text="To OtherFragment"
39 android:textAllCaps="false"/>
40
41 <Button
42 android:id="@+id/back"
43 android:layout_width="wrap_content"
44 android:layout_height="wrap_content"
45 android:text="back"/>
46
47 </LinearLayout>
48 </FrameLayout>
49
50
51
52 </LinearLayout>my_fragment.xml:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent">
6
7 <TextView
8 android:layout_width="match_parent"
9 android:layout_height="wrap_content"
10 android:text="MyFragment"
11 android:textSize="40sp"
12 android:gravity="center_horizontal"/>
13
14 <Button
15 android:id="@+id/my_button"
16 android:layout_width="wrap_content"
17 android:layout_height="wrap_content"
18 android:textAllCaps="false"
19 android:text="To YourFragment"/>
20
21 <Button
22 android:id="@+id/my_other"
23 android:layout_width="wrap_content"
24 android:layout_height="wrap_content"
25 android:textAllCaps="false"
26 android:text="To OtherActivity"/>
27
28 </LinearLayout>other_fragment.xml:
<?xml version="1.0" encoding="utf-8"?>
<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:
1 <?xml version="1.0" encoding="utf-8"?>
2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3 android:orientation="vertical"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent"
6 android:background="#0fa345">
7
8 <TextView
9 android:layout_width="match_parent"
10 android:layout_height="wrap_content"
11 android:gravity="center_horizontal"
12 android:textSize="40sp"
13 android:text="YourFragment"/>
14
15 <Button
16 android:id="@+id/my_return"
17 android:layout_width="wrap_content"
18 android:layout_height="wrap_content"
19 android:text="RETURN"
20 />
21
22 </LinearLayout>参考：Android Fragment的四种跳转
我的CSDN：Fragment的四种跳转方式_SY_XLR的博客-CSDN博客_fragment跳转
https://www.cnblogs.com/xlr03/p/16735358.html
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