安卓在同一个Activity中实现fragment的切换

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一个简单的计算器程序

MainActivity：

package com.hdu.a15041929.homework3;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentActivity;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentTransaction;public class MainActivity extends FragmentActivity {    private int a;    private int b;    private int ans;    @Override    public void onCreate(@Nullable Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_fragment);        FragmentManager fm = getSupportFragmentManager();        Fragment fragment = fm.findFragmentById(R.id.fragmentContainer);        if (fragment == null) {            FragmentTransaction ft = fm.beginTransaction();            fragment = new Fragment1();            ft.add(R.id.fragmentContainer,fragment,"f1");         /*   fragment = new Fragment2();            ft.add(R.id.fragmentContainer,fragment,"f2");            ft.hide(fragment);*/            ft.commit();        }    }    public void ShowFragment(int index){        FragmentManager fm = getSupportFragmentManager();        Fragment fragment;        FragmentTransaction ft = fm.beginTransaction();        if (index==1){            fragment = fm.findFragmentByTag("f1");            ft.show(fragment);            fragment = new Fragment2();            ft.add(R.id.fragmentContainer,fragment,"f2");            ft.hide(fragment);        }else{            fragment = new Fragment2();            ft.add(R.id.fragmentContainer,fragment,"f2");            fragment = fm.findFragmentByTag("f1");            ft.hide(fragment);        }        ft.commit();    }    public void SetData(int a, int b, int ans){        this.a = a;        this.b = b;        this.ans = ans;    }    public int Geta(){       return a;    }    public int Getb(){        return b;    }    public int Getans(){        return ans;    }}

Fragment1：

package com.hdu.a15041929.homework3;import android.os.Bundle;import android.support.v4.app.Fragment;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.Button;import android.widget.EditText;/** * Created by TS on 2017/11/21. */public class Fragment1 extends Fragment{    private EditText tv1;    private EditText tv2;    private int a;    private int b;    private int answer;    private Button confirm;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment1,container,false);        confirm = (Button)view.findViewById(R.id.button);        tv1=(EditText) view.findViewById(R.id.num1);        tv2=(EditText) view.findViewById(R.id.num2);        Log.i("传输","1");        confirm.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                a = Integer.valueOf(tv1.getText().toString());                b = Integer.valueOf(tv2.getText().toString());                answer = a * b;                Log.i("传输",String.valueOf(a));                ((MainActivity)getActivity()).SetData(a,b,answer);                ((MainActivity)getActivity()).ShowFragment(2);            }        });        return view;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }}

Fragment2：

package com.hdu.a15041929.homework3;import android.os.Bundle;import android.support.v4.app.Fragment;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;/** * Created by TS on 2017/11/23. */public class Fragment2 extends Fragment {    private TextView text;    private int a;    private int b;    private int ans;    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View view = inflater.inflate(R.layout.fragment2, container, false);        text = (TextView)view.findViewById(R.id.textView2);        a = ((MainActivity)getActivity()).Geta();        b = ((MainActivity)getActivity()).Getb();        ans = ((MainActivity)getActivity()).Getans();        Log.i("传输","2");        Log.i("传输",String.valueOf(a));        text.setText(a+" * "+b+" 的结果是 "+ans);        return view;    }    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);    }}

布局文件就是两个界面fragment和一个空白的activity_fragment。

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