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：  

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：

新建一个my_fragment.xml布局与MyFragment类

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();    }}

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。

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) {                                //压栈式跳转                getActivity().getSupportFragmentManager()                        .beginTransaction()                        .replace(R.id.fragment_container, new YourFragment(), null)                        .addToBackStack(null)                        .commit();            }        });

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：

myOther.setOnClickListener(new View.OnClickListener() {                        @Override            public void onClick(View v) {                Intent intent = new Intent(getActivity(),OtherActivity.class);                startActivity(intent);            }        });

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：

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);            }        });    }

所有代码文件

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) {                                //压栈式跳转                getActivity().getSupportFragmentManager()                        .beginTransaction()                        .replace(R.id.fragment_container, new YourFragment(), null)                        .addToBackStack(null)                        .commit();            }        });        myOther.setOnClickListener(new View.OnClickListener() {                        @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() {                        @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() {                        @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:

activity_other.xml:

my_fragment.xml:

other_fragment.xml:

your_fragment.xml:

参考：Android Fragment的四种跳转

来源地址：https://blog.csdn.net/m0_61465701/article/details/126145181