掌握Android高级自定义控件开发技巧

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资源摘要信息:"Android开发中的自定义控件是一个高级话题,它涉及到Android系统架构和Java编程语言的深入理解。通过学习和掌握Android自定义控件,开发者不仅能够创建与众不同的用户界面元素,还能够优化应用性能并提高用户体验。本资源的标题'Android_moify_widget.zip_android开发_Java_'暗示了一个压缩包文件,它可能包含了关于Android自定义控件的详细教程或示例代码。文件名称列表中提到的'Android自定义控件.pdf'进一步证实了这一点,表明文件内容很可能是一个关于如何使用Java在Android平台上开发自定义控件的指南或教程。" 知识点详细说明: 1. Android开发概述: Android是一种基于Linux内核的开源操作系统,主要用于移动设备如智能手机和平板电脑。它由Google主导开发,并且拥有一个由开发者社区组成的庞大生态系统。Android应用主要使用Java语言编写,并通过Android SDK(Software Development Kit)进行开发。SDK提供了开发工具、APIs(应用程序编程接口)、模拟器以及文档等资源。 2. Java编程语言: Java是一种高级的、面向对象的编程语言,被广泛用于Android应用开发。它具有跨平台的特性,即“一次编写,到处运行”的能力,这使得用Java编写的Android应用能够运行在不同的硬件和操作系统上。Java的核心概念包括类、对象、继承、多态等面向对象的特性,以及异常处理、泛型、集合框架等高级特性。 3. Android自定义控件的定义和用途: 在Android开发中,控件(Widget)是用户界面中的基本元素,例如按钮、文本框、列表视图等。自定义控件是指开发者不仅仅使用系统提供的标准控件,还可能需要根据特定的应用需求来创建新的控件。自定义控件可以是现有控件的扩展,也可以是全新的复合控件。它们允许开发者实现独特的设计和交互功能,从而提升用户体验。 4. Android自定义控件的实现方式: 实现自定义控件通常有几种方法:继承现有的控件类(如View或其子类)并重写其方法;将多个控件组合成一个新的复合控件;或者是完全从零开始绘制一个新的视图。在实现自定义控件时,开发者需要了解如何处理布局参数、绘制图形、响应用户输入事件等。 5. Android自定义控件的高级特性: 高级自定义控件可能包含动画效果、触摸反馈、自适应布局等。这些特性增强了控件的交互性和视觉效果,但同时也要求开发者对Android的绘图系统、动画框架和布局管理有深入的了解。 6. Android自定义控件开发教程: 资源中提到的'Android自定义控件.pdf'可能包含如何创建自定义控件的详细步骤,包括示例代码和解释说明。教程可能涵盖了控件的生命周期、测量和布局过程、绘制流程以及事件处理等方面。 总结: 通过掌握Android自定义控件的开发,开发者能够创建更加丰富和个性化的用户界面,进而提升应用的竞争力。此资源将为那些希望深入Android开发的Java程序员提供重要的指导和支持。从控件的定义、实现方法到高级特性,以及可能包含的教程,本资源是一份宝贵的参考资料,值得所有有志于提高Android应用开发水平的开发者深入学习。

# -*- coding: UTF-8 -*- from lib2to3.pgen2 import driver from appium import webdriver from appium.webdriver.common.appiumby import AppiumBy el1 = driver.find_element(by=AppiumBy.ACCESSIBILITY_ID, value="通讯录") el1.click() el2 = driver.find_element(by=AppiumBy.XPATH, value="/hierarchy/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.view.ViewGroup/android.widget.FrameLayout[1]/android.widget.FrameLayout/android.widget.ListView/android.widget.FrameLayout[3]/android.widget.RelativeLayout") el2.click() el3 = driver.find_element(by=AppiumBy.XPATH, value="/hierarchy/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.view.ViewGroup/android.widget.FrameLayout[2]/android.view.ViewGroup/android.view.ViewGroup/androidx.recyclerview.widget.RecyclerView/android.view.ViewGroup[1]/android.widget.TextView") el3.click() el4 = driver.find_element(by=AppiumBy.XPATH, value="/hierarchy/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.view.ViewGroup/android.widget.FrameLayout[2]/android.view.ViewGroup/android.view.ViewGroup/androidx.recyclerview.widget.RecyclerView/android.view.ViewGroup[8]") el4.click() el5 = driver.find_element(by=AppiumBy.XPATH, value="/hierarchy/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.widget.LinearLayout/android.widget.FrameLayout/android.view.ViewGroup/android.widget.FrameLayout[2]/android.view.ViewGroup/android.view.ViewGroup/androidx.recyclerview.widget.RecyclerView/android.view.ViewGroup[11]") el5.click()

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E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.hjschoolhelper210301201_1, PID: 13135 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at com.example.hjschoolhelper210301201_1.ClubinfoAdpter.getView(ClubinfoAdpter.java:44) at android.widget.AbsListView.obtainView(AbsListView.java:2458) at android.widget.ListView.makeAndAddView(ListView.java:2067) at android.widget.ListView.fillDown(ListView.java:793) at android.widget.ListView.fillFromTop(ListView.java:855) at android.widget.ListView.layoutChildren(ListView.java:1838) at android.widget.AbsListView.onLayout(AbsListView.java:2255) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at androidx.constraintlayout.widget.ConstraintLayout.onLayout(ConstraintLayout.java:1855) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332) at android.widget.FrameLayout.onLayout(FrameLayout.java:270) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at androidx.appcompat.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:536) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332) at android.widget.FrameLayout.onLayout(FrameLayout.java:270) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1891) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1729) at android.widget.LinearLayout.onLayout(LinearLayout.java:1638) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332) at android.widget.FrameLayout.onLayout(FrameLayout.java:270) at com.android.internal.policy.DecorView.onLayout(DecorView.java:799) at android.view.View.layout(View.java:23693) at android.view.ViewGroup.layout(ViewGroup.java:6413) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3999) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:3372) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:2328) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:9087) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1231) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1239) at android.view.Choreographer.doCallbacks(Choreographer.java:899) at android.view.Choreographer.doFrame(Choreographer.java:832) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1214) at android.os.Handler.handleCallback(Handler.java:942) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7872) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936)

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java.lang.IllegalStateException: ScrollView can host only one direct child at androidx.core.widget.NestedScrollView.addView(NestedScrollView.java:507) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:1131) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72) at android.view.LayoutInflater.rInflate(LayoutInflater.java:1101) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088) at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:1130) at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72) at android.view.LayoutInflater.rInflate(LayoutInflater.java:1101) at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1088) at android.view.LayoutInflater.inflate(LayoutInflater.java:686) at android.view.LayoutInflater.inflate(LayoutInflater.java:505) at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:360) at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:443) at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:121) at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:722) at com.android.tools.idea.rendering.RenderTask.lambda$inflate$9(RenderTask.java:879) at com.android.tools.idea.rendering.RenderExecutor$runAsyncActionWithTimeout$3.run(RenderExecutor.kt:194) at com.android.tools.idea.rendering.RenderExecutor$PriorityRunnable.run(RenderExecutor.kt:292) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829)

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<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <androidx.swiperefreshlayout.widget.SwipeRefreshLayout android:id="@+id/home_swiperefresh" android:layout_width="match_parent" android:layout_height="match_parent" > <androidx.recyclerview.widget.RecyclerView android:id="@+id/home_recyclerview" android:layout_width="match_parent" android:layout_height="match_parent" /> </androidx.swiperefreshlayout.widget.SwipeRefreshLayout> <androidx.appcompat.widget.Toolbar android:layout_width="match_parent" android:layout_height="80dp" app:layout_constrainTop_toTopOf="parent" > <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_vertical" android:orientation="horizontal" > <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/ic_home_scan_24"/> <TextView android:layout_width="0dp" android:layout_height="wrap_content" android:layout_marginStart="8dp" android:layout_marginEnd="18dp" android:layout_weight="1" android:background="@color/white" android:cursorVisible="false" android:focusable="false" android:hint="搜索" android:minHeight="30dp" android:textSize="16dp" /> </LinearLayout> </androidx.appcompat.widget.Toolbar> </androidx.constraintlayout.widget.ConstraintLayout>

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E/AndroidRuntime: FATAL EXCEPTION: Thread-3 Process: com.example.zfang.course2_1, PID: 31755 android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:6855) at android.view.ViewRootImpl.invalidateChildInParent(ViewRootImpl.java:1075) at android.view.ViewGroup.invalidateChild(ViewGroup.java:5242) at android.view.View.invalidateInternal(View.java:13574) at android.view.View.invalidate(View.java:13538) at android.view.View.invalidate(View.java:13522) at android.widget.TextView.checkForRelayout(TextView.java:7354) at android.widget.TextView.setText(TextView.java:4479) at android.widget.TextView.setText(TextView.java:4336) at android.widget.TextView.setText(TextView.java:4311) at com.example.zfang.course2_1.fragment.MineFragment$1$1.showProgress(MineFragment.java:89) at com.example.zfang.course2_1.service.DownloadService$1.run(DownloadService.java:86) at java.lang.Thread.run(Thread.java:761) D/EGL_emulation: eglMakeCurrent: 0xa9d850c0: ver 2 0 (tinfo 0xa9d831d0) D/OpenGLRenderer: endAllActiveAnimators on 0x8c994500 (RippleDrawable) with handle 0xa9dff550 W/System.err: java.net.SocketTimeoutException: connect timed out W/System.err: at java.net.PlainSocketImpl.socketConnect(Native Method) W/System.err: at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:334) W/System.err: at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:196) W/System.err: at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178) W/System.err: at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:356) W/System.err: at java.net.Socket.connect(Socket.java:586) W/System.err: at com.android.okhttp.internal.Platform.connectSocket(Platform.java:113) W/System.err:

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