SD card SDcard get external storage directory Android

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Environment.getExternalStorageDirectory()+ File.separator


Boolean canWrite =	Environment.getExternalStorageDirectory().canWrite() ;
if(canWrite){
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "my_image.jpg")
f.createNewFile();
}else{

}

AndroidManifest.xml

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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324

Set Default Start Up Activity Class Java AndroidManifest xml | set-default-start-up-activity-class-java-androidmanifest-xml

Insert into your default start up activity tag inten-filter tag with action MAIN and category LAUNCHER


            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>

AndroidManifest.xml


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="//schemas.android.com/apk/res/android"
    package="com.example.blabol"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

312

Import project Android Eclipse | import-project-android-eclipse

Import a new Android project for example downloaded from internet via Eclipse into project folder.

Right click into projects explorer in Eclipse and select Import

Android

Existing Android Code Into Workspace

Root Directory (select folder of downloaded project)

Check your downloaded project

Check Copy project into Workspace

Finish (press)

If, else if, else statement Java Android example | if-else-if-else-statement-java-android-example

if , else if, else statement with string as a switch statement in Java example source code.

MainClass.java


public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = {"nothing", "Hello", "people"
				, "bye-bye", "hello", "world!", "end" };
		for (int i = 0; i < arrayOfString.length; i++) {
			
			if (arrayOfString[i].equals("Hello"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("people"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("hello"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("world!"))
				System.out.println(arrayOfString[i]);
			else // default
				System.out.println("Default");
		}
	}
}
/*
Default
Hello
people
Default
hello
world!
Default 
 */

How quickly restart adb.exe ADB server Android emulator example | how-quickly-restart-adb-exe-adb-server-android-emulator-example

Create file restartADB.bat in folder
c:\Program Files\Android\android-sdk-windows\platform-tools\
Write into restartADB.bat this code:


adb kill-server && adb start-server
pause

Save restartADB.bat file.
If you want restart adb.exe server, run restartADB.bat by double click on icon.

Next example:

Open Total Commander

Open folder with adb.exe usually in
c:\Program Files\Android\android-sdk-windows\platform-tools\

Put into command line command: adb kill-server && adb start-server and press Enter

[caption id="attachment_778" align="alignleft" width="300" caption="ADB server restart by command line"]

[/caption]

Try restart ADB if this or similar errors:
Emulator] emulator: emulator window was out of view and was recentred

213

Round number float - double to int - long Java example | round-number-float-to-int-java-example


int nf = Math.round(5.789f);
System.out.print(nf); // 6

float f = 28.611f; 
int n3 = Math.round(f);
System.out.println(n3); // 29

double d = 1234.56;
long lon = Math.round(d);
System.out.println(lon); // 1235

int diff = 90 - 40;
// float fDeleni = diff / 10; // error code
float fDeleni = (float)diff / 10.f; // ok
int nRound = Math.round(fDeleni);


// Caution:
int n2 = (int) 8.999f;
System.out.println(n2); // 8

Editace: 2013-12-09 10:08:22
Počet článků v kategorii: 397
Url:sd-card-get-external-storage-directory-android

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