android screen magnifier app

1 common resolutions for Android phones today1.1 Common resolutions for mobile phones:4:3VGA 640*480 (Video Graphics Array)QVGA 320*240 (Quarter VGA)HVGA 480*320 (half-size VGA)SVGA 800*600 (Super VGA)5:3WVGA 800*480 (Wide VGA)16:9FWVGA 854*480 (full Wide VGA)HD 1920*1080 HDQHD 960*540720p 1280*720 SD1080p 1920*1080 HD1.2 Resolution corresponds to DPI"HVGA-------->mdpi""WVGA-------->hdpi""FWVGA-------->hdpi""QHD-------->hdpi""720P-------->xhdpi""1080P

Inadvertently opened a year ago to do an Android app code, see the implementation of a small function point (such as the title), now write an article to make a note. The problem was that when rotating the screen, the number of columns and widths of the GridView were adapted to the width of the screen, and a certain amo

tab columns of six tabs in layout-xlarge. If the application layout is the same on all devices, layout of different sizes is not considered. The layout * folder shows that the application supports horizontal and vertical screens on hdpi and xhdpi, and the layout of the horizontal and vertical screens is inconsistent, but the layout of devices of different sizes is not considered.The style before Android3.0 differs greatly from that after Android3.0 (including 3.0). In the figure, the

During android development, the onConfigurationChanged event is triggered when the screen changes from Portrait evaluation to landscape evaluation by default. By default, the screen is reloaded and the screen is the same as the landscape evaluation, there will be two problems, Layout problems, the layout displayed on t

understand faster.1, create a new project Lesson35_helloappwidget, note that creation Activity may not be selected when creating.2, ready a widget display layout file Layout/widget.xml, the content is as follows:xml/html Code XML version= "1.0" encoding="Utf-8"?> linearlayoutandroid:layout_ Height= "fill_parent" android:layout_width= "fill_parent" android:orientation= "vertical" xmlns:android= "http://schemas.android.com/apk/res/android

Previous "Android" read all the pictures on the SDcard card and show that the reading process has a progress bar display (click the Open link) test on the real machine is very problematic, often encountered memory overflow, the situation of the card dead. Because of the memory on the real machine now, 2G has rarely seen, basically all 8G look like. This app is unfriendly because it puts the read-out image o

Out_rightleft.xml -- exit the screen from right to left: 1 Animation effect created In Layout, the view_layout.xml Layout file (this time, three images of the animation are directly distributed to ViewFlipper through LinearLayOut ): 1 Java implementation code in Activity: 1 import android. OS. bundle; 2 import android. support. annotation. nullable; 3 impor

Considerations for screen adaptation 1. Androidmanifest.xml settingsAdding child elements in MenifestAndroid:anydensity= "true" when the application is installed on a different density terminal, the program loads the resources in the xxhdpi, xhdpi, hdpi, MDPI, ldpi folders, respectively.Conversely, if set to False, the app does not automatically look for resources under the folder, even if it has the same r

window with System_alert_window permissions and displaying it on top of all other applications and Windows. The advent of Android M makes ransomware-making people encounter a major bottleneck in the implementation of mobile phone ransomware-dynamic permission requests, since Android M, System_alert_window began to be classified as a more dangerous privilege to be treated specially-that is, the need for use

Android devices are so diverse that it's a pain to get your app to fit all the screens, and we need to understand the definition of dimension in Android before we fit in.How is dimension defined in Android?Dimension units supported in Android are PX,IN,MM,PT,DP,SP, commonly

activity when switching between the two screensAndroid:configchanges= "Orientation|screensize|keyboardhidden" The following code can be used in the manifest file to write the screen orientation of the dead activityandroid:screenorientation= "Portrait" vertical screen --android: screenorientation= "Landscape" horizontal

After completing the previous lesson (creating a simple user interface), we already have an app (app) that shows an activity (an interface) that contains a text field and a button. In this lesson, we will add some new code to the MyActivity start of a new activity when the user clicks the Send button.Response Send button1 Open the Content_my.xml file in the Res/layout directory in