Hashtable find value by key Java Android example
Hashtable find value by key Java Android basic example.
import java.util.Hashtable;
public class MainClass {
public static void main(String[] arg) {
// english;germany dictionary
String[] arrayOfString = { "one;eine", "two;zwei", "three;drei" };
Hashtable hashTable = new Hashtable();
for(String s: arrayOfString){
String[] array = s.split(";");
String sKey ="", sValue="";
if(array.length > 1){
sKey = array[0]; sValue = array[1];
hashTable.put(sKey, sValue);
}
}
// check if key exists
if( hashTable.containsKey("two")){
System.out.print("two = " + hashTable.get("two"));
}
}
}
/*
two = zwei
*/
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InputStream, getResources(),openRawResource()
java.io.InputStream is;
is = context.getResources().openRawResource(R.drawable.my_image);
Drawable mDrawable = context.getResources().getDrawable(R.drawable.button);
mDrawable.setBounds(150, 20, 300, 100);
Drawable[] mDrawables;
int[] resIDs = new int[] {
R.drawable.btn_ok,
R.drawable.btn_storno,
R.drawable.btn_help
};
mDrawables = new Drawable[resIDs.length];
Drawable prev = mDrawable;
for (int i = 0; i < resIDs.length; i++) {
mDrawables[i] = context.getResources().getDrawable(resIDs[i]);
mDrawables[i].setDither(true);
addToTheRight(mDrawables[i], prev);
prev = mDrawables[i];
}
The source attachment does not contain the source for the file TextWatcher.class.
You can change the source attachment by clicking Change Attached Source below:
You have to add JDK src.zip path to dialog as on image below.
[caption id="attachment_1091" align="alignleft" width="282" caption="class file editor source not found Eclipse warning"][/caption]
Or go to Project > Properties > Java Build Path > Libraries
Expand JRE System Library. Expand rt.jar.
Select Source attachment and double click or Edit.
Type path the source code file (External File…) and press OK.
[caption id="attachment_1094" align="alignleft" width="300" caption="Java project build path"][/caption]
[caption id="attachment_1105" align="alignleft" width="300" caption="Java JRE deifiniton path in Eclipse"][/caption]
Now if mouse move about keywords String or F3 on keywords and press button in yellow field will opened String.class
You can change the source attachment by clicking Change Attached Source below:
You have to add JDK src.zip path to dialog as on image below.
[caption id="attachment_1091" align="alignleft" width="282" caption="class file editor source not found Eclipse warning"][/caption]
Or go to Project > Properties > Java Build Path > Libraries
Expand JRE System Library. Expand rt.jar.
Select Source attachment and double click or Edit.
Type path the source code file (External File…) and press OK.
[caption id="attachment_1094" align="alignleft" width="300" caption="Java project build path"][/caption]
Or type path in Java JRE definition
[caption id="attachment_1105" align="alignleft" width="300" caption="Java JRE deifiniton path in Eclipse"][/caption]
How open String.class or others keywords definition with Eclipse.
Now if mouse move about keywords String or F3 on keywords and press button in yellow field will opened String.class
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static Bitmap codec(Bitmap src, Bitmap.CompressFormat format,
int quality) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
src.compress(format, quality, os);
byte[] array = os.toByteArray();
return BitmapFactory.decodeByteArray(array, 0, array.length);
}
private static class SampleView extends View {
// CONSTRUCTOR
public SampleView(Context context) {
super(context);
setFocusable(true);
}
@Override
protected void onDraw(Canvas canvas) {
Paint paint = new Paint();
canvas.drawColor(Color.YELLOW);
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.flower_blue);
Bitmap bPNGcompress = codec(bmp, Bitmap.CompressFormat.PNG, 0);
int h = bmp.getHeight();
canvas.drawBitmap(bmp, 10,10, paint);
canvas.drawBitmap(bPNGcompress, 10,10 + h + 10, paint);
}
}
}
File -> Settings -> Keymap you can do select Eclipse keymap from drop down menu
Ctrl+Shift+A (Help | Find Action on the main menu) and start typing the name of the action. Choose the desired action from the suggestion list.
Ctrl+Click (on Windows) or Cmd+Click (on MacOS) a tab in the editor to navigate to any part of the file path. Select the necessary element in the drop-down, and the corresponding file path opens in an external browser (e.g., in the Explorer, if your OS is Windows).
Ctrl+F find
Refactor | Rename: Shift+F6 ( +F6)
Find and replace: CTRL + R
Go to variable declaration: CTRL + B
Ctrl+Shift+I (View | Quick Definition)
Ctrl+Alt+F7 (Edit | Find | Show Usages in the main menu)
Ctrl+Shift+F find in project
Ctrl+Shift+F7 (Edit | Find | Highlight Usages in File) to quickly highlight usages of some variable in the current file.
Use F3 and Shift+F3 keys to navigate through highlighted usages.
Press Escape to remove highlighting.
Ctrl+W (extend selection) in the editor selects the word at the caret and then selects expanding areas of the source code. For example, it may select a method name, then the expression that calls this method, then the whole statement, then the containing block, etc. You can also select the word at the caret and the expanding areas of the source code by double-clicking the target areas in the editor.
To search through the classes, files, tool windows, actions, settings, and symbols of your project by double pressing the Shift key
Ctrl+P (View | Parameter Info) e.g. localURL = new URL(localUrlString); select localUrlString and press Ctrl + P
Show html documentation tooltips: CTRL + Q
Comment uncomment single line: CTRL + /
Comment uncomment selected text: CTRL + SHIFT + /
Code completion (Ctrl+Space)
Alt key and mouse pointer dragging for column selection
If nothing is selected in the editor, and you press Ctrl+C, then the whole line at caret is copied to the clipboard.
Ctrl + Delete delete word from caret to end.
Ctrl + Backspace delete word from caret to start.
Duplicate line: CTRL + D
To compare two directories,or jar files, select one or both of them in the Project view and press Ctrl+D.
Editor Delete Line: CTRL + Y
Move line UP, DOWN. Select a code fragment and press Ctrl+Shift+Up or Ctrl+Shift+Down.
To open any class or file in the editor at the desired line, press Ctrl+Shift+N (Navigate | File), start typing the name, and choose the one from the suggestion list. Then type the colon (:) and a line number
Ctrl+Shift+Enter to complete a current statement such as if, do-while, try-catch, return (or a method call)
Alt+Enter to invoke a quick fix or intention action, press the right arrow key to reveal the list of additional options.
To quickly review your recent changes to the project: Alt+Shift+C
Code Completion, you can accept the currently highlighted selection in the popup list with the period character (.), comma (,), semicolon (;), space and other characters.
Quickly move between methods in the editor: Alt+Up and Alt+Down
Ctrl+Shift+J shortcut joins two lines into one and removes unnecessary space to match your code style
Ctrl+Shift+V to choose and insert recent clipboard contents into the text
Inheritance hierarchy for a selected class: Ctrl+H
Right-clicking on a breakpoint marker you can quickly enable/disable the breakpoint or adjust its properties.
Evaluate the value of any expression while debugging the program, select its text in the editor (you may press a Ctrl+W a few times to efficiently perform this operation) and press Alt+F8.
Quickly evaluate the value of any expression while debugging the program, hold Alt and click this expression to see its value and calculate it, call a method, etc.
You can use the Extract Variable refactoring even on incomplete statements. Just select the necessary block in the editor and press Ctrl+Alt+V.
To open any particular method or field in editor: Ctrl+Alt+Shift+N
Add unimplemented methods: CTRL + I
Override methods: CTRL + O
Format code: CTRL + ALT + L
Show project: ALT + 1
Show logcat: ALT + 6
Hide project - logcat: SHIFT + ESC
Build: CTRL + F9
Build and Run: CTRL + F10
Alt+Shift+F10 access the Run/Debug dropdown on the main toolbar
Collapse all: CTRL + SHIFT + NumPad +
Expand all: CTRL + SHIFT + NumPad -
Ctrl+Shift+A (Help | Find Action on the main menu) and start typing the name of the action. Choose the desired action from the suggestion list.
Ctrl+Click (on Windows) or Cmd+Click (on MacOS) a tab in the editor to navigate to any part of the file path. Select the necessary element in the drop-down, and the corresponding file path opens in an external browser (e.g., in the Explorer, if your OS is Windows).
Find - Rename
Ctrl+F find
Refactor | Rename: Shift+F6 ( +F6)
Find and replace: CTRL + R
Go to variable declaration: CTRL + B
Ctrl+Shift+I (View | Quick Definition)
Ctrl+Alt+F7 (Edit | Find | Show Usages in the main menu)
Ctrl+Shift+F find in project
Ctrl+Shift+F7 (Edit | Find | Highlight Usages in File) to quickly highlight usages of some variable in the current file.
Use F3 and Shift+F3 keys to navigate through highlighted usages.
Press Escape to remove highlighting.
Ctrl+W (extend selection) in the editor selects the word at the caret and then selects expanding areas of the source code. For example, it may select a method name, then the expression that calls this method, then the whole statement, then the containing block, etc. You can also select the word at the caret and the expanding areas of the source code by double-clicking the target areas in the editor.
To search through the classes, files, tool windows, actions, settings, and symbols of your project by double pressing the Shift key
Ctrl+P (View | Parameter Info) e.g. localURL = new URL(localUrlString); select localUrlString and press Ctrl + P
Show html documentation tooltips: CTRL + Q
Edit
Comment uncomment single line: CTRL + /
Comment uncomment selected text: CTRL + SHIFT + /
Code completion (Ctrl+Space)
Alt key and mouse pointer dragging for column selection
If nothing is selected in the editor, and you press Ctrl+C, then the whole line at caret is copied to the clipboard.
Ctrl + Delete delete word from caret to end.
Ctrl + Backspace delete word from caret to start.
Duplicate line: CTRL + D
To compare two directories,or jar files, select one or both of them in the Project view and press Ctrl+D.
Editor Delete Line: CTRL + Y
Move line UP, DOWN. Select a code fragment and press Ctrl+Shift+Up or Ctrl+Shift+Down.
To open any class or file in the editor at the desired line, press Ctrl+Shift+N (Navigate | File), start typing the name, and choose the one from the suggestion list. Then type the colon (:) and a line number
Ctrl+Shift+Enter to complete a current statement such as if, do-while, try-catch, return (or a method call)
Alt+Enter to invoke a quick fix or intention action, press the right arrow key to reveal the list of additional options.
To quickly review your recent changes to the project: Alt+Shift+C
Code Completion, you can accept the currently highlighted selection in the popup list with the period character (.), comma (,), semicolon (;), space and other characters.
Quickly move between methods in the editor: Alt+Up and Alt+Down
Ctrl+Shift+J shortcut joins two lines into one and removes unnecessary space to match your code style
Ctrl+Shift+V to choose and insert recent clipboard contents into the text
Inheritance hierarchy for a selected class: Ctrl+H
Right-clicking on a breakpoint marker you can quickly enable/disable the breakpoint or adjust its properties.
Evaluate the value of any expression while debugging the program, select its text in the editor (you may press a Ctrl+W a few times to efficiently perform this operation) and press Alt+F8.
Quickly evaluate the value of any expression while debugging the program, hold Alt and click this expression to see its value and calculate it, call a method, etc.
You can use the Extract Variable refactoring even on incomplete statements. Just select the necessary block in the editor and press Ctrl+Alt+V.
To open any particular method or field in editor: Ctrl+Alt+Shift+N
Add unimplemented methods: CTRL + I
Override methods: CTRL + O
Format code: CTRL + ALT + L
Show project: ALT + 1
Show logcat: ALT + 6
Hide project - logcat: SHIFT + ESC
Build: CTRL + F9
Build and Run: CTRL + F10
Alt+Shift+F10 access the Run/Debug dropdown on the main toolbar
Collapse all: CTRL + SHIFT + NumPad +
Expand all: CTRL + SHIFT + NumPad -
Try this:
- check names of drawables (file name must contain only abc...xyz 012...789 _ . in Resources folder ,
names have to start with lower case
MyImage.jpg == problem ,
names with space
my image.jpg == problem,
names with -
my-image.png == problem)
- check duplicate names with other extension ( my_image.jpg - my_image.png makes the problem)
- restart Android Studio
- if problem persist:
- check c:\Users\me\AndroidStudioProjects\myProject\myModule\build\intermediates\res\merged\debug\ drawable folder for corupted names or delete ALL drawable folders
- synk projekt, rebuild projekt
- if problem persist:
- restart Android Studio, wait for complete closure of the Android Studio!
- check names of drawables (file name must contain only abc...xyz 012...789 _ . in Resources folder ,
names have to start with lower case
MyImage.jpg == problem ,
names with space
my image.jpg == problem,
names with -
my-image.png == problem)
- check duplicate names with other extension ( my_image.jpg - my_image.png makes the problem)
- restart Android Studio
- if problem persist:
- check c:\Users\me\AndroidStudioProjects\myProject\myModule\build\intermediates\res\merged\debug\ drawable folder for corupted names or delete ALL drawable folders
- synk projekt, rebuild projekt
- if problem persist:
- restart Android Studio, wait for complete closure of the Android Studio!
Editace: 2013-12-09 10:56:31
Počet článků v kategorii: 396
Url:hashtable-find-value-by-key-java-android-example