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) {
                /** 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();

            }
        });

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() {
            /**
             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);
            }
        });

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) {
                /** 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:





    



activity_other.xml:




    
        

            

            

my_fragment.xml:




    

    

other_fragment.xml:






    

    

your_fragment.xml:




    

    

参考:Android Fragment的四种跳转

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