android 中FragmentActivity中模拟返回键返回上一个Activity效果

FragmentTransaction中先加入一个Fragment，这个Fragment就是当前要显示的Fragment，

当通过事件触发显示第二个Fragment时，在加入第二个Fragment并调用fragmentTransaction.addToBackStack(null);

在onBackPressed方法中调用mFragmentManager.popBackStack();回到第一个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;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);//新建两个Fragmentfragment1 = new Fragment1();fragment2 = new Fragment2();mFragmentManager = getFragmentManager();//Fragment事务fragmentTransaction = mFragmentManager.beginTransaction();//增加执行的动画效果 动画不能用我们的Tween动画，后面会有代码fragmentTransaction.setCustomAnimations(R.anim.animation_view, R.anim.animation_view_exit);//加入1个FragmentfragmentTransaction.add(R.id.myFrameLayout, fragment1);fragmentTransaction.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);fragmentTransaction.commit();button1 = (Button)findViewById(R.id.button1);button1.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {fragmentTransaction = mFragmentManager.beginTransaction();//执行动画，显示fragment2fragmentTransaction.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();}}});}@Overridepublic 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;}@Overrideprotected void onResume() {super.onResume();}@Overridepublic void onBackPressed() {super.onBackPressed();mFragmentManager.popBackStack();}}

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