Difference between revisions of "Android Programming/ru"

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(New page: ==How to...== ===Build the NDK OpenGL example=== Just follow these steps: '''Step 1''' - Download and install the Android NDK, Android SDK and Ant. More information here: [[Android_Inte...)
 
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==How to...==
 
  
===Build the NDK OpenGL example===
 
 
Just follow these steps:
 
 
'''Step 1''' - Download and install the Android NDK, Android SDK and Ant. More information here: [[Android_Interface/Using_the_Android_SDK%2C_Emulator_and_Phones]]
 
 
'''Step 2''' - Install the pre-compiled FPC cross-compiler. Instructions here: [[Android_Interface#Using_the_pre-compiled_compiler]]
 
 
'''Step 3''' - Download the latest lazarus-ccr sourceforge code:
 
 
svn co https://lazarus-ccr.svn.sourceforge.net/svnroot/lazarus-ccr lazarus-ccr
 
 
or if you think it is too big you can download just the folder lazarus-ccr/bindings/android-ndk
 
 
'''Step 4''' - Building the Pascal Library
 
 
Open the project lazarus-ccr/bindings/android-ndk/examples/opengltest/opengltest.lpi
 
 
Go to Project->Project Options->Paths and where is written "Libraries -Fl" you should see this value:
 
 
/home/felipe/Programas/android-ndk-r5/platforms/android-9/arch-arm/usr/lib
 
 
Change it to the correct path in your system which points to the NDK and to the library folder for your minimal required Android API Level
 
 
Now build the project using Lazarus.
 
 
'''Step 5''' - Configuring the build environment
 
 
Open the file opengltest/local.properties and in this line:
 
 
sdk.dir=/home/felipe/Programas/android-sdk-linux
 
 
Change this to point to your SDK location
 
 
'''Step 6''' - Buildings the APK
 
 
Open a terminal and type these commands:
 
 
cd lazarus-ccr/bindings/ndk/examples/opengltest/android
 
ant debug
 
 
The APK file will be placed in opengltest/android/bin/
 
 
'''Step 7''' - Install the APK
 
 
In this step if you get error messages about permissions read: [[Android_Interface/Using_the_Android_SDK%2C_Emulator_and_Phones#Recognition_of_devices_under_Linux]]
 
 
The command to install our APK in the phone is:
 
 
cd opengltest/android
 
~/Programas/android-sdk-linux/platform-tools/adb install bin/OpenGLNDKTest-debug.apk
 
2395 KB/s (107299 bytes in 0.043s)
 
        pkg: /data/local/tmp/OpenGLNDKTest-debug.apk
 
Success
 
 
If you get an error message that it is already installed you can install with this command:
 
 
~/Programas/android-sdk-linux/platform-tools/adb uninstall com.pascal.opengltest
 
 
And then you can run adb logcat to see what the log says while you start it in the phone via its newly added icon:
 
 
~/Programas/android-sdk-linux/platform-tools/adb logcat
 
 
===Read the screen metrics===
 
 
First fill a TDisplayMetrics with the correct info:
 
 
<delphi>
 
uses androidutil;
 
 
var
 
  MyDisplayMetrics: TDisplayMetrics;
 
  Str: string;
 
  //
 
  lHeight, lWidth: Integer;
 
  xdpi, ydpi, lScreenSize: Single;
 
begin
 
  // ..
 
  // Objects
 
 
  MyDisplayMetrics := TDisplayMetrics.Create;
 
  Activity.getWindowManager().getDefaultDisplay().getMetrics(MyDisplayMetrics);
 
</delphi>
 
 
And then you can read it from the TDisplayMetrics:
 
 
<delphi>
 
  lHeight := MyDisplayMetrics.heightPixels();
 
  lWidth := MyDisplayMetrics.widthPixels();
 
  xdpi := MyDisplayMetrics.xdpi();
 
  ydpi := MyDisplayMetrics.ydpi();
 
  lScreenSize := sqrt(sqr(lHeight / ydpi) + sqr(lWidth / xdpi));
 
  ldensity := MyDisplayMetrics.density();
 
  ldensityDpi := MyDisplayMetrics.densityDpi();
 
  scaledDensity := MyDisplayMetrics.scaledDensity();
 
</delphi>
 
 
Note that lots of devices lie about the xdpi and ydpi, so don't trust the lScreenSize calculated above. Smartphones might report even 10 inches of screen size, while the correct is around 4.
 

Revision as of 06:33, 6 February 2012