Develop Reference

Clickable days from a List of days

Hi all I have a question ,if someone can help me implement this design or give me a path to look from.
Actually i want to implement this UI , a user can select one ore more days ,when he selecte a day the fond of the day become bold when he unselect the day the style of the day become normal like Saturday in our case
i tried to implement this UI using toogle button but unfortunately i failed can anyone help me achieve this goal
thank you all for your help

You could have something like this if you are using multiple TextView's in something like a LinearLayout.
public class BoldTextView extends TextView implements View.OnClickListener {
private boolean bold = false;
public BoldTextView(Context context) {
this(context, null);
}
public BoldTextView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public BoldTextView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
setOnClickListener(this);
}
#Override
public void onClick(View v) {
if (bold) {
bold = false;
setTypeface(null, Typeface.NORMAL);
} else {
bold = true;
setTypeface(null, Typeface.BOLD);
}
}
public boolean isBold() {
return bold;
}
}

VisibilityAwareImageButton Usage

I was recently working with ImageButtons and I came across this new type of ImageButton 'VisibilityAwareImageButton'. It would be really helpful if someone could tell me the usage of this ImageButton and how is it different from the regular ImageButton? Thanks in advance :)

Here's the full source for VisibilityAwareImageButton.
class VisibilityAwareImageButton extends ImageButton {
private int mUserSetVisibility;
public VisibilityAwareImageButton(Context context) {
this(context, null);
}
public VisibilityAwareImageButton(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public VisibilityAwareImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
mUserSetVisibility = getVisibility();
}
#Override
public void setVisibility(int visibility) {
internalSetVisibility(visibility, true);
}
final void internalSetVisibility(int visibility, boolean fromUser) {
super.setVisibility(visibility);
if (fromUser) {
mUserSetVisibility = visibility;
}
}
final int getUserSetVisibility() {
return mUserSetVisibility;
}
}
It appears to be almost exactly the same as a regular ImageButton, only it keeps track of the last visibility actually set by the user. The only usage I can find is in the FloatingActionButton source. It is used to keep track of what the user wants the visibility of the view to be while it does it's own internal changes and animations. i.e.
if (child.getUserSetVisibility() != VISIBLE) {
// The view isn't set to be visible so skip changing it's visibility
return false;
}
It's in the design support library and has package visibility, so it seems like Google intends on using it internally (and seemingly only for the FAB implementation at this time).

Android RTL password fields?

It appears that if you have an EditText on android with the
android:inputType="textPassword" or android:password="true
fields on them, right-to-left text does NOT appear right-to-left (stays left-to-right).
However without the password denotations the text does appear RTL.
Is this a known issue or is there a workaround?

For 17+ (4.2.x+) you can use textAlignment
android:textAlignment="viewStart"

The only solution I've found was to set the gravity programatically to LEFT or RIGHT after setting the inputType.

In my case, the problem was simply solved by changing the layout_width to wrap_content.

If you put inputType = textPassword or set a passwordTransformation method on EditText, text direction is taken as LTR. It means RTL for password is discouraged. You need to write custom TextView to override this behaviour.
Code snippet from android source for TextView.
// PasswordTransformationMethod always have LTR text direction heuristics returned by
// getTextDirectionHeuristic, needs reset
mTextDir = getTextDirectionHeuristic();
protected TextDirectionHeuristic getTextDirectionHeuristic() {
if (hasPasswordTransformationMethod()) {
// passwords fields should be LTR
return TextDirectionHeuristics.LTR;
}

In My Case both worked fine.
1) android:textAlignment="viewStart"
And
2)
https://stackoverflow.com/a/38291472/6493661

and the right answer is:
RtlEditText mUserPassword = root.findViewById(R.id.register_fragment_password);
mUserPassword.setTransformationMethod(new AsteriskPasswordTransformationMethod());
creating our own EditText!
it work prefectly only if you replace the dot with astrix by AsteriskPasswordTransformationMethod below this code.
public class RtlEditText extends EditText {
public RtlEditText(Context context) {
super(context);
}
public RtlEditText(Context context, #Nullable AttributeSet attrs) {
super(context, attrs);
}
public RtlEditText(Context context, #Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public RtlEditText(Context context, #Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
#Override
public TextDirectionHeuristic getTextDirectionHeuristic() {
// passwords fields should be LTR
return TextDirectionHeuristics.ANYRTL_LTR;
}}
public class AsteriskPasswordTransformationMethod extends PasswordTransformationMethod {
#Override
public CharSequence getTransformation(CharSequence source, View view) {
return new PasswordCharSequence(source);
}
private class PasswordCharSequence implements CharSequence {
private CharSequence mSource;
public PasswordCharSequence(CharSequence source) {
mSource = source; // Store char sequence
}
public char charAt(int index) {
return '*'; // This is the important part
}
public int length() {
return mSource.length(); // Return default
}
public CharSequence subSequence(int start, int end) {
return mSource.subSequence(start, end); // Return default
}
}
}

how do you color percentage of a textview in android?

I know Spannable can help me color any specific letters in a textview. However, is it possible to color 1/2 or 1/3 of a letter. I wanted to color text within a textview by percentage instead of by letter. Thanks for reading, and please let me know if you had some idea or solution to this.
thanks

It may be easier to use Spanned thought android.text.HTML
So something like this:
Spanned text = HTML.fromHtml("Sp<span style=\"color:red\">ann</span>able");
textView.setText(text);
It can also be used to add images, but it a bit more complicated.
UPDATE
I re-read your question and thought of a solution. You could create a custom view that has two textViews in a FrameLayout (on top of each other) and then resize the one on the top relative to the percentage. Something like this:
import android.content.Context;
import android.content.res.ColorStateList;
import android.util.AttributeSet;
import android.widget.FrameLayout;
import android.widget.TextView;
public class ProgressTextView extends FrameLayout {
private TextView backgroundTextView;
private TextView foregroundTextView;
private CharSequence text;
private ProgressTextView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context, attrs);
}
private ProgressTextView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
private ProgressTextView(Context context) {
super(context);
init(context, null);
}
private void init(Context context, AttributeSet attrs) {
backgroundTextView = new TextView(context);
foregroundTextView = new TextView(context);
addView(backgroundTextView);
addView(foregroundTextView);
// process custom attributeSet from xml to set the colours
}
public void setBackgroundTextColor(int color) {
backgroundTextView.setTextColor(color);
}
public void setBackgroundTextColor(ColorStateList colors) {
backgroundTextView.setTextColor(colors);
}
public void setForegroundTextColor(int color) {
backgroundTextView.setTextColor(color);
}
public void setForegroundTextColor(ColorStateList colors) {
backgroundTextView.setTextColor(colors);
}
public void setPercentage(float per) {
foregroundTextView.setWidth((((float) backgroundTextView.getWidth()) / 100f) * per);
}
public void setText(CharSequence text) {
this.text = text;
backgroundTextView.setText(text);
foregroundTextView.setText(text);
}
public CharSequence getText() {
return text;
}
}
PS: not tested ;) just an idea
MORE UPDATE
Apparently, with this method the text gets shortened instead of just cropped as I expected. The maybe on creation of the foregroundTextView you could do this:
foregroundTextView = new TextView(context) {
#Override
protected void onDraw (Canvas canvas) {
super.onDraw(canvas);
Rect bounds = canvas.getClipBounds();
bounds.right (((float) bounds.right) / 100.0f) * per;
canvas.clipRect(bounds);
}
};
And also add the per variable and modify setPercentage(float per) to be just a setter:
private float per = 0.0f;
public void setPercentage(float per) {
this.per = per;
}
Hope this one works ;)

You could draw the letters yourself on a canvas. Each letter consisting of a bunch of interconnected arcs, that way you could style each individually.
Having to draw each letter would be considerably painstaking though, e.g., paint.setColor(), canvas.drawArc(), paint.setColor(), canvas.drawArc(), and so on...

create a drawable and override it's onDraw method and paint canvas how you wish and set it as background to your textview

Prevent ToggleButton from switching state

I have a ToggleButton, when you click it, I don't want the state to change. I will handle state changes myself when after I receive feedback from whatever the button toggled. How might I prevent the state change on click?

You can implement your own ToggleButton with overriden toggle() method with empty body.

You could simply use the CheckedTextView instead.
Of course, you need to set a background image and a text based on the state, but other than those (which you might have used already), it's a nice alternative solution.
here's a sample code in case you miss the textOn and textOff attributes:
CheckableTextView.java :
public class CheckableTextView extends CheckedTextView {
private CharSequence mTextOn, mTextOff;
public CheckableTextView (final Context context, final AttributeSet attrs, final int defStyle) {
super(context, attrs, defStyle);
final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CheckableTextView, defStyle, 0);
mTextOn = a.getString(R.styleable.CheckableTextView_textOn);
mTextOff = a.getString(R.styleable.CheckableTextView_textOff);
a.recycle();
}
public CheckableTextView(final Context context, final AttributeSet attrs) {
this(context, attrs, 0);
}
public CheckableTextView(final Context context) {
this(context, null, 0);
}
#Override
public void setChecked(final boolean checked) {
super.setChecked(checked);
if (mTextOn == null && mTextOff == null)
return;
if (checked)
super.setText(mTextOn);
else
super.setText(mTextOff);
}
public void setTextOff(final CharSequence textOff) {
this.mTextOff = textOff;
}
public void setTextOn(final CharSequence textOn) {
this.mTextOn = textOn;
}
public CharSequence getTextOff() {
return this.mTextOff;
}
public CharSequence getTextOn() {
return this.mTextOn;
}
}
in res/values/attr.xml :
<declare-styleable name="SyncMeCheckableTextView">
<attr name="textOn" format="reference|string" />
<attr name="textOff" format="reference|string" />
</declare-styleable>
another possible solution would be to use setClickable(false) on the ToggleButton, and handle onTouchListener when the motion action is ACTION_UP .

While I think you can just mark it as disabled, I don't think it is a good idea, as users are used to a certain semantic of such a button.
If you only want to show some state, why don't you use an ImageView and show different images depending on state?