fragment | 易学教程

App crashing on buttonclick how can I solved it android studio

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问题 Here is the code: button.setOnClickListener(new View.OnClickListener() { @Override public void onClick (View view){ Intent contactPickerIntent = new Intent(Intent.ACTION_PICK, ContactsContract.CommonDataKinds.Phone.CONTENT_URI); startActivityForResult(contactPickerIntent, RESULT_PICK_CONTACT); } }); return view;} public void but(View v) { Intent contactPickerIntent = new Intent(Intent.ACTION_PICK, ContactsContract.CommonDataKinds.Phone.CONTENT_URI); startActivityForResult(contactPickerIntent,

Android Fragment Inflate layout

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问题 Hi I'm working with a view pager and fragments. I would like to override orientation changes so that the onCreateView method isn't run everytime the orientation changes. This is because a lot is run in onCreateView for my app which causes the orientation to be slow to change. Also things on my server are checked and what not too so there really is no reason for all of it to run just because the orientation changed. Here is what i've set up so far I have this on the MainActivity in the

error OnListItemClick and setListAdapter is undefined for the type fragment

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问题 i have error in onListItemClick error message is "The method onListItemClick(ListView, View, int, long) is undefined for the type Fragment" and setListAdapter error message is "The method setListAdapter(SimpleCursorAdapter) is undefined for the type ReviewFragment", this my full code, import android.app.Fragment; import android.os.Bundle; import android.support.v4.widget.SimpleCursorAdapter; import android.app.AlertDialog; import android.app.ListActivity; import android.content

[Unity Shader] Shader学习笔记2

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Unity 有三种编写shader的方式： surface shaders , vertex and fragment shaders , fixed function shaders . fixed function shader （固定功能着色器）：对应于固定管线硬件的操作，最简单的着色器类型，只能使用Unity3D自带的固定语法和提供的方法，适用于任何硬件，使用难度最小。 vertex and fragment shader （顶点片段程序着色器）：顶点和片段着色器，如前所述，是可编程图形管线主要支持的方式。是效果最为丰富的着色器类型，使用Cg/HLSL语言规范，着色器由顶点程序和片段程序组成。所有效果都需要自己编写，使用难度相对较大。 surface shader （表面着色器）： Unity推荐的shader类型。同样使用Cg/HLSL语言规范的着色器类型，不过把光照模型提取出来，可以使用Unity3D自带的一些光照模型，也可以自己编写光照模型，着色器同样由顶点程序和片段程序组成，不过本身有默认的程序方法，使用者可以只针对自己关系的效果部分进行编写。由于选择性比较大，所以可以编写出较为丰富的效果，使用难度相对vertex and fragment shader小。可以理解其是对Vertex 和

Android 知识梳理目录

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一、Java 知识梳理 Java&Android 基础知识梳理(0) - Java 基础知识大纲 Java&Android 基础知识梳理(1) - 注解 Java&Android 基础知识梳理(2) - 序列化 Java&Android 基础知识梳理(3) - 内存区域 Java&Android 基础知识梳理(4) - 垃圾收集器与内存分配策略 Java&Android 基础知识梳理(5) - 类加载&对象实例化 Java&Android 基础知识梳理(6) - 字节输入输出流 Java&Android 基础知识梳理(7) - Android 虚拟机 Java&Android 基础知识梳理(8) - 容器类 Java&Android 基础知识梳理(9) - LruCache 源码解析 Java&Android 基础知识梳理(10) - SparseArray 源码解析 Java&Android 基础知识梳理(11) - 浅拷贝 Vs 深拷贝 Java&Android 基础知识梳理(12) - 泛型 Java&Android 基础知识梳理(13) - 反射二、Android 基础知识 2.1 Activity 知识梳理 Activity 知识梳理(1) - Activity 生命周期 Activity 知识梳理(2) - Activity 栈 Activity 知识梳理(3) -

Listview replaces first item instead of creating new items

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问题 I am trying to add String items to my ListView using Fragments . I have four Buttons . Each time a Button is clicked, the ListView should add a String item: "Button 1,2,3, or 4 clicked" The problem is that it keeps replacing the first String item with the clicked Button String . It does not create new items. Here is my code: ListViewFragment.java: public class ListViewFragment1 extends Fragment { protected ArrayAdapter<String> adapter1; @Override public View onCreateView(LayoutInflater

how to fix `Type mismatch: cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager` error in android?

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问题 I am getting the following error Type mismatch: cannot convert from android.app.FragmentManager to android.support.v4.app.FragmentManager for the following line FragmentManager frgManager = getFragmentManager(); frgManager.beginTransaction().replace(R.id.content_frame, fragment).commit() I have the following imports in my class import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentTransaction; How to fix the error? 回答1:

calling a fragment from fragment

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问题 I want to call another fragment from the current fragment on the click of the button in the current fragment. Here is my Mainactivity : import android.app.FragmentManager; import android.os.Bundle; import android.support.design.widget.FloatingActionButton; import android.support.design.widget.Snackbar; import android.view.View; import android.support.design.widget.NavigationView; import android.support.v4.view.GravityCompat; import android.support.v4.widget.DrawerLayout; import android

ProgressDialog doesn't appear immediately

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问题 I have a fragment with some buttons in it, when a button is clicked it should show a ProgressDialog, load an array of bitmaps and show it in the fragment in a gallery, dismiss ProgressDialog. But the ProgressDialog doesn't show immediately, it take something like 1 or 2 seconds and it just blink at the moment when my gallery is show. Im doing this after click: try{ progress = ProgressDialog.show(activity, "", "Loading images", true); //load images //show gallery }catch(){ //... }finally{

Vue双向绑定的实现原理系列（四）：补充指令解析器compile

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补充指令解析器compile github源码补充下HTML节点类型的知识：元素节点　　Node.ELEMENT_NODE(1) 属性节点　　Node.ATTRIBUTE_NODE(2) 文本节点　　Node.TEXT_NODE(3) CDATA节点 Node.CDATA_SECTION_NODE(4) 实体引用名称节点　　 Node.ENTRY_REFERENCE_NODE(5) 实体名称节点　　Node.ENTITY_NODE(6) 处理指令节点　　Node.PROCESSING_INSTRUCTION_NODE(7) 注释节点　 Node.COMMENT_NODE(8) 文档节点　 Node.DOCUMENT_NODE(9) 文档类型节点　　Node.DOCUMENT_TYPE_NODE(10) 文档片段节点　　Node.DOCUMENT_FRAGMENT_NODE(11) DTD声明节点 Node.NOTATION_NODE(12) Compile指令解析器,解析DOM节点，直接固定某个节点进行替换数据的解析模板指令，替换模板数据,初始化试图将模板指令对应的节点绑定对应的更新函数，初始化对应的订阅器首先需要获取到DOM元素，然后对含有DOM元素上含有指令的节点进行处理，因此这个环节需要对DOM操作比较频繁，所有可以先建一个fragment片段

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