mobile_android_misc.md

Misc - Android

• OpenCV configuration in Android Studio

MultiDex application compiling

• guidance in chinese. describe the way to get multidex.jar

• good guidance in english

Gradle

• [Gradle version 1.10 is required. Current version is 2.2.1. If using the gradle wrapper]

  • instead of down-grade the gradle version, updating the requirement is a better solution.

• Gradle DSL method not found: 'android()'

• error for runproguard()

ADB command

• Extract a file: adb pull sdcard/log.file
• Delete a file: adb shell rm -r sdcard/log.file
• Cat a file: adb -d shell cat /sdcard/chirpproc.txt

Debugging for multithread app

Put the following code fragment in the beginning of doInBackground:

```android.os.Debug.waitForDebugger();```

Then when you set a breakpoint in that thread; eclipse will find it.

Maven/eclipse compatibility

Source directory difference error. Project Property -> Java Build Path -> Source -> Add Foler /src/main/java -> remove the conflicting one.

• Can't import library project into android studio project

• Maven Gradle Tricks

Examples

• multi-touch
• Tabbed application

Basic Logging code

	public static void appendlog(String text){
		File logFile = new File("sdcard/log.file");
		if (!logFile.exists())
		{
			try
			{
				logFile.createNewFile();
			} 
			catch (IOException e)
			{
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		try
		{
			//BufferedWriter for performance, true to set append to file flag
			BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true)); 
			buf.append(text);
			buf.newLine();
			buf.close();
		}
		catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

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