how to view pdf files on android

Preface: The previous article wrote the use of Sharedpreferences in Android to save data, sharedpreferences when saving data is mainly to save some application settings information or a small amount of user information, And it is the information of the string class saved in the form of Key-value, which is more limited. For example, you need to save the image from the network to local as the cache data, and the number is large, sharedpreferences can no

Android project notepad (13) ----- view pictures and play recordings This article is my learning notes, welcome to reprint, but please note the Source: http://blog.csdn.net/jesson20121020 Today, we will implement the function of viewing images and recordings. When editing or browsing the notebook, click an image to open a custom Activity (of course, you can also call the image library of the system to

Android custom view Method1. Where does the custom view start! Where can I start painting? View has several methods.One of them is known as OnDraw (). However, if you want to call and refresh at any time, what should you use? If you have done win api development, you will know the inVidate () method. This is the method

that stores the final APK files. If it is convenient, you can view the modified helloworld.apk in the distfolder. However, you must note that this APK file has no signature, so it cannot be installed and run. The last step is to sign the APK. The signing tool we need is auto-sign. It uses the batch processing command to sign the APK file using signapk. jar. You can use NotePad to open sign. BAT and check i

Android Custom view, mainly inherits view, then implements OnDraw this method, to draw. 1. Write your own custom view 2. Join Logical Threads 3. Extracting and Encapsulating custom view 4. Use XML to define styles to affect display effects First, write y

without blocking the main thread, but only one request can be processed at the same time.After knowing the instructions of Intentservice, we continue to look at the code, first look at the definition of Intentservice member variables, the code is as follows:Provides Message Queuing and private volatile Looper mservicelooper;//processing messages private volatile Servicehandler mservicehandler;// Represents the worker thread's name private String mname;//whether to resend Intentprivate Boolean M

. Because Android is a mobile operating system platform, if we open the analogy more, will occupy the system resources, resulting in slow system. Therefore, as far as possible to reduce the interface or class definition, but also to do as far as possible the readability of the program is better. Launch the simulator and deploy our program. Enter the filename and file contents and click Save. Where is the file saved on

· Sometimes using the Android simulator to simulate SD card related operations, in Eclipse can directly view the SD card directory;First, the new simulator to create the SD card, the size of the storage as needed to create;Launch the emulator to open the view window in eclipse: Window--show view--file Explorer;You can

/blog_933d50ba0100wq1h.html Second, read and write files in Android (1) Get the file from the Raw folder in resource and read the data (resource file can only read and write, \res\raw\test.txt) Copy Code code as follows: String res = ""; try{ InputStream in = Getresources (). Openrawresource (R.raw.test); int length = in.available (); byte [] buffer = newbyte[length]; In.read (buff

cropping a mixed graphHere are the custom Customtitleview.java files: public class CustomView extends View {private Paint mpaint;//brush Private Context mcontext;//Contextual environment reference private Bitmap Bitmap; Bitmap private int x,y;//bitmap is drawn when the upper-left corner of the start coordinates public customview (context context) {Super (context, NULL);} Public CustomView (context cont

Fos=NULL; Try { //files are copied to SD cardFIS =NewFileInputStream (DBFile); FOS=NewFileOutputStream (Environment.getexternalstoragedirectory (). GetAbsolutePath () + "/copy.db"); intLen = 0; byte[] buffer =New byte[2048]; while( -1!= (len=fis.read (buffer))) {fos.write (buffer,0, Len); } fos.flush (); } Catch(Exception e) {e.printstacktrace (); }finally { //Turn off Data flow Try { if(Fos! =N

In the case of database operations, the execution of operations statements such as queries or deletions often fails, but there is no specific reason for finding them. The following is a command-line way to perform database operations to verify that the database operation statements in Android are correct, and so on.The following are the steps:(1) Enter into the console, enter the ADB shell, into the command mode environment;(2) Input command: cd/data/

In Android, AsyncTask downloads files in the background and displays the download progress from the drop-down menu. androidasynctask During development, you always need to download files from the network, and sometimes you need to display the download progress in the drop-down menu. Now I have written a Demo that encapsulates the code for downloading

Hello everyone, we are going to use Android mediaplayer today Step 1: Preparation work. Mksdcard 512 M sdcard. img Create a new AVD named androidsdcard Push songs into sdcard (before you push, you make sure your AVD is running, else the operation of push will not work ): ADB push F:/music/1.mp3/sdcard Step 2: Layout UI desigen: Create two. xml files we called song_item.xml and songlist. xml the Cod

Previous Blog Handler principle of Android in the H when the Andler When it comes to how Android's activity boot works to the OnCreate method, This article mainly from the OnCreate method we need to write the method Setcontentview start, study how layout view is loaded into the mobile phone form. When you run to Setcontentview, you are actually running thepublic void Setcontentview (int layoutresid) {

Baidu Cloud software users to the detailed analysis to share the Baidu cloud Android version to see the transmission progress of the method. Method Sharing: Baidu Cloud Android Version View transmission Progress method: Click on "Transfer List" to view the download list, you can

="fill_parent"> 6 7 android:layout_width="fill_parent" 8 android:layout_height="wrap_content" 9 android:lines="4"/>10 11 android:layout_width="wrap_content"12 android:layout_height="wrap_content" 13 android:text="@string/write"/>14 15 android:layout_width="fill_parent"16 android:layout_height="wrap_content"17 android:editable="false"18 android:cursorVisible="false"19 android:lines="4"/> 20 21 android:layout_width="wrap_content"22 androi

-files based on the listed sub-items until all files are found. FAQs 1. resource files can only be obtained in InputStream ModeWhat should I do if I want to operate on a file? What should I do if I want to use a file Uri. API alone is certainly not good. It only gives you InputStream, that is, it is read-only. A feasible method is to read the file, write it int

Http://www.see-source.com/androidwidget/list.html?type=7Androidprogresslayoutcontrols that display prompt information based on load conditionsGoogleprogressbarAndroid implements several styles of progress bar in GoogleTitanicdynamic wave-shaped animations are gradually populated with textview, which can be used to loadBounceprogressbarJumping Wave animation effect of ProgressBar, similar to desktopcircularprogressa control that mimics the loading view

Before this is the first phone to open root permissions, you can use the Android Brush Wizard , such as a key root softwareSecond, like Meizu, millet and other mobile phones can not execute the SU command after the root, so unable to authorize the file in the phone, need to download a supersu rights managerWith them we can begin the following steps:1.window->show View->other2. Enter File Lookup3. Come out n