android studio 2 2

tasks, android Development Network prompts that Because Java GC does not need to be manually released, you must be extremely careful when assigning the GC. Frequent GC operations still affect the performance, during debugging, we can use logcat to view the memory release status. 2. Recycling When accessing an attribute, the efficiency is far lower than that of a fixed variable. If the number of cycles is u

Allows your Android app to use multiple themes (Part 2) In the first part of this post, we have created a light theme and made initial preparation to support multiple themes. in this blog post, we will continue that effort, creating another theme and allowing dynamic switching of themes during runtime. In the previous blog, we created a bright style topic and made some preparations for using multiple theme

=/cygdrive/Ndk=/cygdrive/e/android-ndk-r6Export NDKThe NDK name is random, for the convenience of later use, choose a short name, and then saveJune 7, 2013: It must be noted here, the input can not have extra symbols, it is best not to copy and paste, I tried many times, direct copy paste absolutely to error. When opening that file, it's best not to use Notepad, which I opened with notepad++.3, open Cygwin, enter the CD $NDK, if the output of the/CYGD

Four storage methods for Android data: SharedPreferences, SQLite, Content Provider, and File (2) -- SQLite and androidsqlite SQLite is a lightweight database designed for embedded devices. It has only five data types: NULL: NULL INTEGER: INTEGER REAL: Floating Point Number TEXT: String BLOB: Big Data In SQLite, the BOOLEAN and DATE types are not specifically designed, because the BOOLEAN type can replace tr

MainActivit is as follows: Package c. c; import java. io. file; import java. io. IOException; import android. app. activity; import android. content. pm. activityInfo; import android. media. mediaRecorder; import android. media. mediaRecorder. onInfoListener; import android.

! ");} Catch (sqlexception SE) {se. printstacktrace () ;}@ overridepublic void onopen (sqlitedatabase dB) {// todo auto-generated method stublog. E (TAG, "sqlitehelper on open! "); Super. onopen (db) ;}@ overridepublic void onupgrade (sqlitedatabase dB, int oldversion, int newversion) {// todo auto-generated method stublog. E (TAG, "sqlitehelper onupgrade! ");}} Test Activity Sqlitehelpertest. Java Package COM. yao_guet.test; import android. app

Android Material Design-Using the Material Theme (Using Material themes)-(2), materialandroid Reprinted please indicate the source: http://blog.csdn.net/bbld_/article/details/40400519 The new material topic provides: L allows you to set the system control of the palette. L It is a control (designed) touch feedback animation. L Activity transition Animation You can control your customized material themes b

..." button to launch the Android emulator.Because the new virtual machine has no physical keys, we can use the keyboard keys to operate the Android virtual machine. Simulator keys Keyboard keys Back off Esc Menu F1 or PAGE Up Begin F2 or PAGE Down Call F3 Hanging off F4 power but

 Android okhttp with physical storage media cache: Disklrucache (2)Based on the Appendix article 8,9, this article combines the Android Okhttp with Disklrucache to combine these two technologies to achieve okhttp-based physical storage media cache Disklrucache.Illustrated with a complete example. The code of the example to implement such a process: After the co

); Android: stretchcolumns ="1, 2, 3, 4"It means to automatically stretch columns 1, 2, 3, and 4. Framelayout frame layout. The controls in it are all displayed on the previous control according to one of the following controls. For example: "Wrap_content" Android: layout_height ="Wrap_content"

two simple rules for the android single-thread mode: 1. Do not block the UI thread; 2. do not access the android UI toolkit from outside the UI thread. Worker thread Because of the single-thread mode described above, it is vital that your application UI response does not block the UI thread. If you are not performing instantaneous operations, you should use a se

Android Animation 2: View Animation As stated in the previous blog "Android Animation: Drawable Animation", android Animation is mainly divided into three parts. The previous blog has explained the usage of Drawable Animation, that is, displaying images frame by frame, it is often used to dynamically display a progress

Android source code "application interface" Analysis 2 (PackageManager and PackageManagerService ): I. PackageManager: In the previous article, we usedPackageManager'sGetPackageSizeInfo function to obtain detailed information about the application.PackageManagerTo find out. 1. PackageManager class: It is an abstract class. We only list several functions to be discussed: Definition: publicAbstractClassPack

; // data size codesize = pstats. codesize; // application size }} Step 4Finally, we can obtain the pstats attributes and Their attribute values, and convert them by calling the system function formatter. formatefilesize (long size ). Is a string measured in KB/MB. Important: to obtain the application size through reflection, you must add the following permissions. Otherwise, a warning is reported and the actual value is not obtained. The flowchart is as follows: Demo description: Base

Android sensor (details 2)-common Sensors Direction sensor Orientation (now almost no longer needed, because there is actually no real direction) Magnetic Field Sensor Magnetic Field Temperature sensor Temperature Light pressure sensor Pressure1. direction sensor Orientation: Purpose:The orientation sensor is used to detect the placement status of mobile phone devices. For example, the orientation at the to

use the value.The way I use it will affect the global settings of Android ... It's not necessarily what you want, OH. If you only want to modify the screen brightness of the current app, there's another way: Set the properties of the Window for the Activity. The corresponding Java code is as follows: Windowmanager.layoutparams LP = Window.getattributes (); lp.screenbrightness = brightness; Window.setattributes (LP);If you want to imple

Android UI operations are not thread-safe, and only the main thread can operate the UI. At the same time, the main thread has a certain time limit on UI operations (up to 5 seconds ). To perform some time-consuming operations (such as downloading and opening large files), Android provides some column mechanisms. The articles in the "android basics 02-thread secur

MainActivity: [java] package c. c; import java. io. file; import java. io. IOException; import android. app. activity; import android. content. pm. activityInfo; import android. media. mediaRecorder; import android. OS. bundle; import android. OS. environment; import

Chapter 1 to do a good job, you must first use the Android SDK (2) and androidsdk1.2 device management tools-Introduction to debugging bridge (ADB) 1.2.1ADB ADB, short for Android Debug Bridge, is a tool that comes with the Android SDK. It can be used to directly manage Android