/**
* 抽象一个Activity托管我们的Fragment* @author 白乾涛*/public abstract class BaseFragmentActivity extends Activity {protected abstract Fragment createFragment();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_single_fragment);Fragment fragment = getFragmentManager().findFragmentById(R.id.id_fragment_container);if (fragment == null) {//为什么要在创建fragment前判断它是否为null?//当【Activity】因为屏幕旋转或者因内存不足被系统杀死时,会导致Activity被重新创建,但是这时我们的【fragment】是会被完整保存下来的(系统机制)//并且当Activity被重建时,FragmentManager会首先去获取保存下来的fragment队列,重建fragment队列,因此就可以恢复之前的状态了//所以这里需要判断fragment是否为null,不为空就表明fragment是已经创建过的,此时不需要(也不能)再创建新的fragment,否则会出现多个fragment重叠现象fragment = createFragment();//add方法中id的作用:1、告知fm此fragment的位置;2、此后可以通过findFragmentById找到它getFragmentManager().beginTransaction().add(R.id.id_fragment_container, fragment).commit();}//做你需要的其他事情}}<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical" ><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="我是标题,我下面是一个用于填充Fragment的容器(FrameLayout)"android:textColor="#f00"android:textSize="12sp" /><!-- 填充Fragment的容器 --><FrameLayoutandroid:id="@+id/id_fragment_container"android:layout_width="match_parent"android:layout_height="match_parent" /></LinearLayout>
public class MainActivity extends BaseFragmentActivity {
@Overrideprotected Fragment createFragment() {return new ListTitleFragment(); //当创建的Fragment 不需要参数时,可以直接new}}
public class ContentActivity extends BaseFragmentActivity {@Overrideprotected Fragment createFragment() {//获取从fragment中传递过来的数据String title = getIntent().getStringExtra(ContentFragment.ARGUMENT);return ContentFragment.newInstance(title);//当创建的Fragment需要参数(数据)时,最好交给Fragment自己去处理}}
public class ListTitleFragment extends ListFragment {//public class ListFragment extends Fragment/**结果码*/public static final int REQUEST_DETAIL = 0x110;private List<String> mTitles = Arrays.asList("包青天", "白乾涛", "baiqiantao", "0909082401");private int mCurrentPos;private ArrayAdapter<String> mAdapter;@Overridepublic void onViewCreated(View view, Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);setListAdapter(mAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, mTitles));}@Overridepublic void onListItemClick(ListView l, View v, int position, long id) {mCurrentPos = position;//可以从Fragment中跳转到其他ActivityIntent intent = new Intent(getActivity().getApplicationContext(), ContentActivity.class);//可以携带数据intent.putExtra(ContentFragment.ARGUMENT, mTitles.get(position));//并且可以获取反馈startActivityForResult(intent, REQUEST_DETAIL);}@Override//获取由此Fragment启动的另一个Activity中的一个ContentFragment结束时,ContentFragment返回的数据(数据结束时返回的)public void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_DETAIL && data != null) {String responseEvaluate = data.getStringExtra(ContentFragment.RESPONSE);if (TextUtils.isEmpty(responseEvaluate)) responseEvaluate = "你还没有评价";mTitles.set(mCurrentPos, mTitles.get(mCurrentPos) + " ___ " + responseEvaluate);mAdapter.notifyDataSetChanged();} else Toast.makeText(getActivity(), "你还没有评价哦~", Toast.LENGTH_SHORT).show();}}
public class ContentFragment extends Fragment {/**构造时传入的值**/private String mArgument;/**构造时传入的参数**/public static final String ARGUMENT = "argument";/**当前Fragment返回结果时的返回值对应的Tag*/public static final String RESPONSE = "response";/**为启动的DialogFragment设置一个Tag,方便以后通过findFragmentByTag(tag)找到此Fragment*/public static final String EVALUATE_DIALOG = "evaluate_dialog";/**启动另一个Fragment时的请求码*/public static final int REQUEST_CODE_EVALUATE = 0X110;/**构造时把传入的参数带进来,注意一定要通过Bundle及setArguments传递数据*/public static ContentFragment newInstance(String argument) {//把所有需要传递的数据都放在Bundle中Bundle bundle = new Bundle();bundle.putString(ARGUMENT, argument);ContentFragment contentFragment = new ContentFragment();//通过setArguments把Bundle传递过去contentFragment.setArguments(bundle);return contentFragment;}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//获取传递过来的数据Bundle bundle = getArguments();if (bundle != null) mArgument = bundle.getString(ARGUMENT);}@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {TextView tv = new TextView(getActivity());tv.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT));tv.setText(mArgument);//在一个Fragment中启动另一个Fragmenttv.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {EvaluateDialog dialog = new EvaluateDialog();//注意要设置setTargetFragment,这里的参数表示【此Fragment返回时的目标Fragment】【启动此Fragment时的请求码】dialog.setTargetFragment(ContentFragment.this, REQUEST_CODE_EVALUATE);dialog.show(getFragmentManager(), EVALUATE_DIALOG);}});return tv;}@Override//当另一个Fragment结束时,接收其返回回来的数据public void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);if (requestCode == REQUEST_CODE_EVALUATE && data != null) {//根据返回数据的Fragment返回的数据中的Tag,获取返回数据中我们需要的值String evaluate = data.getStringExtra(EvaluateDialog.RESPONSE_EVALUATE);Toast.makeText(getActivity(), "你的评价为:" + evaluate, Toast.LENGTH_SHORT).show();//将获取到的结果返回Intent intent = new Intent();intent.putExtra(RESPONSE, evaluate);getActivity().setResult(ListTitleFragment.REQUEST_DETAIL, intent);//第一个参数代表结果码,在启动者中定义}}}
/**这是在同一个Activity中,由另一个Fragment启动的一个DialogFragment*/public class EvaluateDialog extends DialogFragment {private String[] mEvaluteVals = new String[] { "优", "差", "良" };/**返回的数据的Key或Tag或Name*/public static final String RESPONSE_EVALUATE = "response_evaluate";@Overridepublic Dialog onCreateDialog(Bundle savedInstanceState) {AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());builder.setTitle("请选择评价 :")//.setCancelable(false)//.setOnCancelListener(null)//.setOnItemSelectedListener(null)//.setIcon(R.drawable.ic_launcher)//.setItems(mEvaluteVals, new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {setResult(which);}});return builder.create();}// 设置返回数据protected void setResult(int which) {// 判断是否设置了targetFragmentif (getTargetFragment() == null) return;Intent intent = new Intent();intent.putExtra(RESPONSE_EVALUATE, mEvaluteVals[which]);//手动调用onActivityResultt进行返回数据,【请求码:由目标Fragment决定】【响应码:由自身决定,要求不严格的话也可随便设置一个】getTargetFragment().onActivityResult(ContentFragment.REQUEST_CODE_EVALUATE, Activity.RESULT_OK, intent);}}
原文:http://www.cnblogs.com/baiqiantao/p/6305995.html