Open Save UTF-8 File To String Java Android Code
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String sFileContent = readFile("myfile.txt",StandardCharsets.UTF_8);
static String readFile(String path, Charset encoding)
throws IOException
{
byte[] encoded = Files.readAllBytes(Paths.get(path));
return encoding.decode(ByteBuffer.wrap(encoded)).toString();
}
// write file
String sOut = "text blah hello world etc.";
writeToFile(sOut"someName.txt");
static void writeToFile(String sB,String name) {
String folder = ("c:\\folder\\");
File f = new File(folder+ name);
BufferedWriter writer = null;
writer = new BufferedWriter( new OutputStreamWriter(
new FileOutputStream( folder+name),"UTF-8"));
writer.write( sB);
if ( writer != null)
writer.close( );
}
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Convert number int to string Android Java example source code.
int n = 0;
try {
n = Integer.parseInt("21"));
} catch(NumberFormatException e) {
System.out.println("Could not parse " + e);
}
// int to string
String s = String.valueOf(24);
// warnning
private List list = new ArrayList();
// ok /put type of added object
private List<String> list = new ArrayList<String>();
Basic difference remember it!!!
if(TRUE && TRUE && TRUE) return TRUE otherwise FALSE
if(FALSE || FALSE || FALSE) return FALSE otherwise TRUE
Logical operator and &&
If all conditions/operands is TRUE return TRUE, otherwise return FALSE
Logical operator or ||
The logical OR operator (||) returns the boolean value true if either or both operands is true and returns false otherwise.
If one operands is TRUE, condition is TRUE:
rev
if(TRUE && TRUE && TRUE) return TRUE otherwise FALSE
if(FALSE || FALSE || FALSE) return FALSE otherwise TRUE
Logical operator and &&
If all conditions/operands is TRUE return TRUE, otherwise return FALSE
if( true and true and true){
// return true - do something
}
int a = 6;
if(a == 6 && a == 6 ) {
// if TRUE
// true && true return true, do something
}
if(a == 6 && a == 5){
// nothing, not attended
}else{
// true && false return false, or false && false return false
// do something
}
Logical operator or ||
The logical OR operator (||) returns the boolean value true if either or both operands is true and returns false otherwise.
If one operands is TRUE, condition is TRUE:
if(FALSE OR FALSE OR TRUE) return TRUE
if(FALSE OR TRUE OR FALSE) return TRUE
if(FALSE OR FALSE OR FALSE) return FALSE
int a = 6;
if(a==6 || a==5){ // TRUE || FALSE return TRUE
//if return TRUE
//one from operadns is TRUE return true, do something
}
if(a==5 || a==4){ // FALSE || FALSE return FALSE
// not attended
}else{
//if return FALSE, do something
}
rev
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)
RelativeLayout like parent, child Srollview is centered horizontal.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.
Second RelativeLayout in SrollView have gravity center, every child will centered horizontally and vertically.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="//schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:gravity="center_horizontal">
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/scrollView2" >
<RelativeLayout
android:layout_width="320dp"
android:layout_height="wrap_content"
android:background="#e6f825"
android:gravity="center">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button" />
</RelativeLayout>
</ScrollView>
</RelativeLayout>
Editace: 2013-08-04 10:40:31
Počet článků v kategorii: 397
Url:open-save-utf-8-file-to-string-java-android-code
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