android viewgroup

deltaY = Math. abs (y-mFirstDownY); switch (action) {case MotionEvent. ACTION_DOWN: attemptClaimDrag (); mFirstDownX = x; mFirstDownY = y; mCurBtnPic = mBtnPressed; mBtnInitPos = mChecked? MBtnOnPos: mBtnOffPos; break; case MotionEvent. ACTION_MOVE: float time = event. getEventTime ()-event. getDownTime (); mBtnPos = mBtnInitPos + event. getX ()-mFirstDownX; if (mBtnPos> = mBtnOffPos) {mBtnPos = mBtnOffPos;} if (mBtnPos 2. Create a layout file preference_widget_checkbox.xml. 3. Rewrite Ch

Android development-Animation (5), androidanimationUse of Animation in android development (5)This blog post mainly describes how to use AnimationLisenter in Animation and how to call such life cycle functions. The code example is as follows:MainActivity. java:Package com. example. animationlistener;Import android. OS. Bundle;Import

Android draws a view. android draws a view. 1. simple description of the process for android to draw a view A simple description can be interpreted as: calculation size (measure), layout coordinate calculation (layout), and drawing to the screen (draw );Next, let's take a look at the actions in each step,Step 1: when the activity is started, the view is called by

[Android] in-depth analysis of scroler and Android scroler from the perspective of source code The source must be indicated for reprinting. Thank you! Http://blog.csdn.net/chdjj In this article, I will analyze the Scroller class from the source code perspective. When reading this article, we suggest you check the source code. Otherwise, you may be confused. I. Use of Scroller Those familiar with

This is my collection of the classic books on Android development, high-definition PDF electronic version, can be downloaded in my Baidu network free of charge, I hope that the need for friends to help. Directory:Android 4 Advanced Programming (full source code included)"Crazy Android Handout""Android App Development (Guo Hongzhi)""

The true logic of Android apps App UI Component Hierarchy Most of the UI components in Android are stored in Android.widget packages and their children, android.view packages, and their child packages, all of which are inherited from The View class , The view class also has an important subclass of ViewGroup, so it has a view feature, but it is primarily used a

android. media. audiofx. presetReverb; import android. media. audiofx. visualizer; import android. OS. bundle; import android. view. gravity; import android. view. motionEvent; import android. view. view; import

View like the status bar in our layout, this visually seems like an immersive effect. It is literally easy to understand the meaning of this, and then analyze the feasibility. First, there are many ways to get our layout. You can set an id for the root layout, and then Activity. findViewById directly gets the root layout. In fact, you can also choose not to get the layout here. You can set a View in xml, and then obtain the View here and set its height to the height of the status bar, the backg

idAndroid: tag attribute: unique stringIf neither of the above is provided, the system uses the container view ID.Loading Method 2: Add Fragment to a ViewGroup by programming When the Activity is in the Running state, you can dynamically add Fragment to the layout of the Activity. You only need to specify the parent View Group to add the Fragment.First, you need a FragmentTransaction instance:FragmentManager fragmentManager = getFragmentManager ()Fra

indicates that the column width can be stretched to fill up the free space in the table. Collapsed indicates that the column will be hidden. Special attributes in TableLayout: Android: collapseColumns Android: shrinkColumns Android: stretchColumns = "0, 1, 2, 3" Demo: we want to design a table with three rows and three columns as follows, but we only want to dis

LinearLayout organizes a view into one row or one column. Child views can be arranged vertically or horizontally. To learn how LinearLayout works, first consider the typical mail. xml file. Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: orientation = "vertical"> Android