android 中FragmentActivity中類比返回鍵返回上一個Activity效果

標籤：

FragmentTransaction中先加入一個Fragment，這個Fragment就是當前要顯示的Fragment，

當通過事件觸發顯示第二個Fragment時，在加入第二個Fragment並調用fragmentTransaction.addToBackStack(null);

在onBackPressed方法中調用mFragmentManager.popBackStack();回到第一個Fragment

package com.example.fragmentdemo;import android.app.Activity;import android.app.FragmentManager;import android.app.FragmentTransaction;import android.content.Intent;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {    private FragmentManager mFragmentManager;    private Fragment1 fragment1;    private Fragment2 fragment2;    private Button button1;    private FragmentTransaction fragmentTransaction;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //建立兩個Fragment        fragment1 = new Fragment1();        fragment2 = new Fragment2();        mFragmentManager = getFragmentManager();        //Fragment事務        fragmentTransaction = mFragmentManager.beginTransaction();        //增加執行的動畫效果 動畫不能用我們的Tween動畫，後面會有代碼        fragmentTransaction.setCustomAnimations(R.anim.animation_view, R.anim.animation_view_exit);        //加入1個Fragment        fragmentTransaction.add(R.id.myFrameLayout, fragment1);        fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);        fragmentTransaction.commit();        button1 = (Button)findViewById(R.id.button1);        button1.setOnClickListener(new OnClickListener() {                        @Override            public void onClick(View v) {                fragmentTransaction = mFragmentManager.beginTransaction();                //執行動畫，顯示fragment2                fragmentTransaction.setCustomAnimations(R.anim.animation_view, R.anim.animation_view_exit);                if (fragment2.isAdded()) {                    fragmentTransaction.commit();                }else{                    fragmentTransaction.add(R.id.myFrameLayout, fragment2);                    fragmentTransaction.addToBackStack(null);                    fragmentTransaction.commit();                }            }        });            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }        @Override    protected void onResume() {                super.onResume();    }    @Override    public void onBackPressed() {        super.onBackPressed();        mFragmentManager.popBackStack();            }        }

 

android 中FragmentActivity中類比返回鍵返回上一個Activity效果