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关于fragment的getActivity()返回null的处理

在fragment的使用中经常要使用getActivity获取依附的activity,但在某些情况下回返回null,如果不加处理可能会因空指针异常导致程序崩溃.所以建议每次使用getActivity...方法都需检查一下. isAdd(){ //这里进行你想要的操作 getActivity() } 或者 if(getActivity()!...isAdded() Return true if the fragment is currently added to its activity.* 表示当前fragment已被添加到activity此时getActivity

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笔记39 | 数据存储之SharedPreferences的介绍及使用

ODO值，其中ODO值为某个实时的can数据，DATE即为当前时间，点击右端的更新按钮就需要将这两个实时值存储在本地用，并显示：存 /* * 存 */ write("of",time(),ftv4,getActivity...()); write("ff",time(),ftv4,getActivity()); write("af",time(),ftv4,getActivity()); write("eo",time(),...ftv4,getActivity()); ... private void write(String s,String time,int odo, Context context){...().getSharedPreferences("eo", Context.MODE_PRIVATE); SharedPreferences preferences_of = getActivity...().getSharedPreferences("of", Context.MODE_PRIVATE); SharedPreferences preferences_ff = getActivity

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6.后台任务封装

String text = etName.getText().toString().trim(); if (TextUtils.isEmpty(text)) { ToastUtil.show(getActivity...request.setHeaders(headers); request.setParameters(parameters); // 2) 序列化 String outPath = DirUtil.getTaskDir(getActivity...task.setOwner(account.getAccount()); task.setPath(outPath); task.setState(0); new BackTaskDao(getActivity...()).addTask(task); // 开启服务 getActivity().startService( new Intent(getActivity(), BackgroundService.class...页面跳转 Intent intent = new Intent(getActivity(), HomeActivity.class); startActivity(intent); getActivity

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Android Fragment回退

view.getId()) { case R.id.btn_register: LoginActivity activity = (LoginActivity) getActivity...().getSupportFragmentManager().beginTransaction(); fragmentTransaction.hide(getActivity...view.getId()) { case R.id.btn_back: FragmentTransaction fragmentTransaction = getActivity...().getSupportFragmentManager().beginTransaction(); fragmentTransaction.show(getActivity...).getSupportFragmentManager().findFragmentByTag("login")); fragmentTransaction.hide(getActivity

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Dagger2在Mvp的应用

设置生命周期监听 * * @author ZhongDaFeng */ private void setListener(T activity) { if (getActivity...= null) { if (activity instanceof BaseActivity) { ((BaseActivity) getActivity...} else if (activity instanceof BaseFragmentActivity) { ((BaseFragmentActivity) getActivity...return mViewRef.get(); } /** * 获取 * * @return */ public T getActivity...= null&&getActivity()!=null){ if(!

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3.加载界面

frameLayout == null) { // 之前的frameLayout 已经记录了一个爹了爹是之前的ViewPager，先干掉之前的爹 frameLayout = new FrameLayout(getActivity...) { public void run() { SystemClock.sleep(2000);//这个方法也能睡 final LoadResult result = load(); if (getActivity...= null) { getActivity().runOnUiThread(new Runnable() {//主线程刷新ui @Override public void run() {...null); return view; } /* 创建了错误界面 */ private View createErrorView() { View view = View.inflate(getActivity...); return view; } /* 创建加载中的界面 */ private View createLoadingView() { View view = View .inflate(getActivity

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Android 带password输入界面的Dialog实现机制

resetPhone with mEraseInternalData: data | app | media //cbk.add //mExt.onResetPhone(getActivity...=false; if(value ==null ){ //Log.d(TAG, "onPairPassword() value ==null"); Toast.makeText(getActivity...} if(value.length()<=0 ){ //Log.d(TAG, "onPairPassword() value ==null"); Toast.makeText(getActivity...//no store the pwd activity mFactRstPwsCheckDialog.dismiss();//finish(); mExt.onResetPhone(getActivity...(), mEraseInternalData, mEraseSdCard); return true; } Toast.makeText(getActivity(), getString

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短视频平台搭建，相机截取图片位置

@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View inflate = View.inflate(getActivity...@Override public void onClick(View v) { AlertDialog.Builder builder= new AlertDialog.Builder(getActivity...stub super.onActivityResult(requestCode, resultCode, data); if(requestCode==1000 && resultCode==getActivity...return-data", true); startActivityForResult(intent, 1001); } if(requestCode==1001 && resultCode==getActivity...return-data", true); startActivityForResult(intent, 2001); } if(requestCode==2001 && resultCode==getActivity

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Android 录音功能直接拿去用

()); View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_record_audio, null...= PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(getActivity...()); View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_record_audio, null...= PackageManager.PERMISSION_GRANTED) { ActivityCompat.requestPermissions(getActivity...()); View view = getActivity().getLayoutInflater().inflate(R.layout.fragment_media_playback,

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Android 必知必会 - DialogFragment 使用总结

为了样式统一和兼容性，可以使用 V7 包下的 AlertDialog.Builder AlertDialog.Builder builder = new AlertDialog.Builder(getActivity...onCreateDialog(Bundle savedInstanceState) { AlertDialog.Builder builder = new AlertDialog.Builder(getActivity...); LayoutInflater inflater = getActivity().getLayoutInflater(); View view = inflater.inflate...： @Override public Dialog onCreateDialog(Bundle savedInstanceState) { LayoutInflater inflater = getActivity...); View view = inflater.inflate(R.layout.fragment_dialog, null); Dialog dialog = new Dialog(getActivity

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羊皮书APP（Android版）开发系列（十八）Android 侧滑菜单栏实现

(RecyclerView) layout.findViewById(R.id.drawerList); adapter = new NavigationDrawerAdapter(getActivity...())); recyclerView.addOnItemTouchListener(new RecyclerTouchListener(getActivity(), recyclerView...fragmentId); mDrawerLayout = drawerLayout; mDrawerToggle = new ActionBarDrawerToggle(getActivity...onDrawerOpened(View drawerView) { super.onDrawerOpened(drawerView); getActivity...onDrawerClosed(View drawerView) { super.onDrawerClosed(drawerView); getActivity

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Glide类似You cannot start a load for a destroyed activity异常简单分析

activity, fm); } } public RequestManager get(Fragment fragment) { if (fragment.getActivity..."); //这里抛出了异常 } if (Util.isOnBackgroundThread()) { return get(fragment.getActivity...() || Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN_MR1) { return get(fragment.getActivity...= null && fragment.getActivity() !...= null && fragment.getActivity() !

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Android 组件化模块化之路——在展示层搭建MVP结构

public interface IView { Activity getActivity(); /** * 请求开始 */ void onStart...{ this.view = view; } @Override public void onCreate() { } Activity getActivity...() { return view.getActivity(); } /** * 用于判断当前view是否已经退出 * * @return...isViewDetached() { if (view == null) { return true; } if (view.getActivity...() == null) { return true; } if (view.getActivity().isFinishing()) {

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Android开发(36) Actionbar的图标和点击事件

显示返回按钮 @Override public void onStart() { super.onStart(); ActionBar actionBar = getActivity...onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { getActivity...Override public void onStart() { //重新显示时，再设置会图标 super.onStart(); ActionBar actionBar = getActivity...public void onPause() {//被覆盖时，记录下图标 super.onPause(); ImageView imageView = (ImageView) getActivity

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Unity3d和Android之间互相调用

使用这个对象来调用对应功能 No11： Activity生命周期的处理：（C#处理的方式） android代码 public void lifeCycle(int status) { if (getActivity...break; case DybGSdkConstants.onResume: BuoyOpenSDK.getIntance().showSmallWindow(getActivity...break; case DybGSdkConstants.onPause: BuoyOpenSDK.getIntance().hideSmallWindow(getActivity...()); BuoyOpenSDK.getIntance().hideBigWindow(getActivity()); break; case DybGSdkConstants.onStop...DybGSdkConstants.onDestroy: OpenHwID.releaseResouce(); BuoyOpenSDK.getIntance().destroy(getActivity

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Android 开发 - 基于okhttp框架封装的开发框架oknet

日志拦截器拦截到 tag =" + tag, " msg = " + msg); } }); post简单请求，和String类型的响应 RequestBuilder.with(getActivity...); 带参数的请求，和 Json序列化的回调 Type t = new TypeToken>() { }.getType(); RequestBuilder.with(getActivity...) throw new RuntimeException("not found ImageCache/CloseIcon.png"); RequestBuilder.with(getActivity...result.count); } }) .excute(); 处理需要显示进度条的情形 RequestBuilder.with(getActivity...******** 没错，你没有看错，仅仅下面一行，进度条就闪亮登场 ************/ .progress(new DialogProgressIndicator(getActivity

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记一次APP的二开

Override public void onClick() { LinearLayout linearLayoutMain = new LinearLayout(fragment.getActivity...("name", s); }}); } SimpleAdapter adapter = new SimpleAdapter(fragment.getActivity...linearLayoutMain.addView(listView); AlertDialog show = new AlertDialog.Builder(fragment.getActivity...l) -> { String name = nameList.get(i).get("name"); Toast.makeText(fragment.getActivity...instanceof P2PSessionActivity) { baseCallAction.setP2PActivity((P2PSessionActivity) fragment.getActivity

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android notification，notificationmanager详解

我们来比较下api11之前的用法这是通用的： PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,...; api11-api16的用法是这样的（主要是新增了自定义通知图标，并且通知的构造方式也发生了改变） PendingIntent pendingIntent2 = PendingIntent.getActivity...Uri.parse("http://blog.csdn.net/xiangzhihong8")); PendingIntent pendingIntent = PendingIntent.getActivity..., Uri.parse("http://blog.csdn.net/itachi85/")); PendingIntent pendingIntent = PendingIntent.getActivity...Uri.parse("http://blog.csdn.net/xiangzhihong8")); PendingIntent pendingIntent = PendingIntent.getActivity

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通过Interface：fragment向activity传值

isVisibleToUser); if (isVisibleToUser) { goodsEntityList = DBManager.getInstance(getActivity...* TODO 模拟数据 */ private void initData() { goodsEntityList = DBManager.getInstance(getActivity...//参数是：上下文、列表方向（横向还是纵向）、是否倒叙 mCollectRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity...false)); //设置item的分割线 mCollectRecyclerView.addItemDecoration(new DividerItemDecoration(getActivity...OnItemClick(View view, data_new data) { //此处进行监听事件的业务处理 Toast.makeText(getActivity

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Android项目开发填坑记-Fragment的onBackPressed

Fragment中的返回在Fragment中经常用到自定义标题栏，而返回按钮的点击事件一般设置为：getActivity().onBackPressed();，这样可以使得点击返回按钮和点击手机上的返回键的效果一致...原因下面我们追踪一下代码调用，找找产生这种现象的原因： Fragment 3.0的getActivity().onBackPressed() Activity类 public void onBackPressed...mFragments.getFragmentManager().popBackStackImmediate()) { finishAfterTransition(); } } Fragment V4的getActivity...Fragment3.0和FragmentV4 Fragment3.0的getActivity().onBackPressed()默认调用了Activity的onBackPressed()方法，方法里面使用的...getFragmentManager()获取FragmentManager对象弹出栈内的Fragment3.0版的Fragment FragmentV4的getActivity().onBackPressed

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关于fragment的getActivity()返回null的处理

笔记39 | 数据存储之SharedPreferences的介绍及使用

6.后台任务封装

Android Fragment回退

Dagger2在Mvp的应用

3.加载界面

Android 带password输入界面的Dialog实现机制

短视频平台搭建，相机截取图片位置

Android 录音功能直接拿去用

Android 必知必会 - DialogFragment 使用总结

羊皮书APP（Android版）开发系列（十八）Android 侧滑菜单栏实现

Glide类似You cannot start a load for a destroyed activity异常简单分析

Android 组件化模块化之路——在展示层搭建MVP结构

Android开发(36) Actionbar的图标和点击事件

Unity3d和Android之间互相调用

Android 开发 - 基于okhttp框架封装的开发框架oknet

记一次APP的二开

android notification，notificationmanager详解

通过Interface：fragment向activity传值

Android项目开发填坑记-Fragment的onBackPressed

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