Missing Android 

Material Components

Dmytro Danylyk

Timee GmbH.

What we have in AppCompat v7?

What we have in design spec?

Ingredients

Typography

Recipe

<style name="Base.TextAppearance.AppCompat.Body1">
    <item name="android:textSize">@dimen/abc_text_size_body_1_material</item>
    <item name="android:textColor">?android:textColorPrimary</item>
</style>

<style name="Base.TextAppearance.AppCompat.Caption">
    <item name="android:textSize">@dimen/abc_text_size_caption_material</item>
    <item name="android:textColor">?android:textColorSecondary</item>
</style>

...

<style name="Base.TextAppearance.AppCompat.Button">
    <item name="android:textSize">@dimen/abc_text_size_button_material</item>
    <item name="textAllCaps">true</item>
    <item name="android:textColor">?android:textColorPrimary</item>
</style>

Code

Material text styles and dimensions are available in appcompat-v7 library.

styles_base_text.xml

Selectors

Lollipop

Older versions

Recipe

<?xml version="1.0" encoding="utf-8"?>
<ripple android:color="@color/flat_pressed">
    <item
        android:id="@android:id/mask"
        android:drawable="@drawable/btn_flat_normal"/>
</ripple>

Code

Result

Android L - Ripple effect

res/drawable-v21

Recipe

<?xml version="1.0" encoding="utf-8"?>
<selector 
    android:exitFadeDuration="400"
    android:enterFadeDuration="400">

    <item android:drawable="@drawable/btn_flat_pressed"
          android:state_pressed="true" />

    <item android:drawable="@android:color/transparent" />

</selector>

Code

Result

Older versions - Fade selector

res/drawable

Shadow

Recipe 1

Wrap view with a CardView and set app:cardElevation attribute. 

Remarks

CardView can't draw circle shadow.

Not possible to set shadow position.

2. 

1. 

Not possible to set shadow color. (Make shadow darker or lighter)

3. 

No method to set selector for shadow. (Lift on touch)

4. 

Recipe 2

Set background 9.png image.

Remarks

For every component you need shadow image for all drawable-dpi folders.

1. 

Ton's of resources increase apk size.

2. 

Not flexible for changes.

3. 

Shadow Layout

app:sl_shadowRadius="4dp"
app:sl_dy="0dp"
app:sl_dx="0dp"
app:sl_shadowRadius="8dp"
app:sl_dy="4dp"
app:sl_dx="0dp"

Recipe 3

<com.dd.ShadowLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:sl_shadowColor="#AA000000"
        app:sl_cornerRadius="4dp"
        app:sl_dy="1dp"
        app:sl_dx="1dp"
        app:sl_shadowRadius="4dp">

    <!--Your view here-->

</com.dd.ShadowLayout>

Code

Custom view group which will wrap View and display shadow for pre Lollipop devices.

res/layout

Remarks

setShadowLayer(float radius, float dx, float dy, int shadowColor)

Approach 1: draw shadow on generated Bitmap with shadow layer.

1. 

Simple ~ 100 lines of code.

3. 

Not very efficient. 

4. 

Approach 2: draw shadow on view canvas. (without hardware acceleration)

2. 

Shadow Layout

Links & Resources

Simple cooking

Buttons

  • Floating action button
  • Raised button
  • Flat button

Flat button

Lollipop

Older versions

Recipe

<style name="AppCompat.Button.Flat" parent="Base.TextAppearance.AppCompat">
    <item name="android:background">@drawable/btn_flat_selector</item>
    <item name="android:minWidth">88dp</item>
    <item name="android:minHeight">36dp</item>

    <item name="android:textAllCaps">true</item>
    <item name="android:textSize">14sp</item>
    <item name="android:textStyle">bold</item>

    ...
</style>

Code

res/values/styles.xml
<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        style="@style/AppCompat.Button.Flat"/>
res/layout

Button with custom style and transparent background selector.

Raised button

Lollipop

Older versions

Recipe

<android.support.v7.widget.CardView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:cardCornerRadius="4dp"
        app:cardPreventCornerOverlap="false"
        app:cardElevation="2dp">

    <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:minWidth="88dp"
            android:minHeight="36dp"
            android:text="Button"
            ...
            />

</android.support.v7.widget.CardView>

Code

Button wrapped with a CardView and cardElevation

res/layout

Floating action button

Lollipop

Older versions

Recipe

<com.dd.ShadowLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:shadowColor="#AA000000"
        app:cornerRadius="56dp"
        app:dy="1dp"
        app:shadowRadius="4dp">

    <ImageButton
            android:layout_width="56dp"
            android:layout_height="56dp"
            android:layout_gravity="center"
            android:src="@drawable/ic_add_white"
            android:background="@drawable/selector"
            android:elevation="4dp"/>

</com.dd.ShadowLayout>

Code

ImageButton with icon and oval shape as a background, wrapped with ShadowLayout to display shadow for pre Lollipop devices.

res/layout

Questions and answers

Why not to use CardView for shadow?

1. 

You can't make card view circle.

Questions and answers

Why not to use png image for shadow?

2. 

Different buttons have different size, shadow radius, position, color - creating separate set of resources is not convenient - but most efficient. 

Floating action button

Links & Resources

Raised button

Flat button

(in progress)

(in progress)

(in progress)

(in progress)

Text fields input error

Recipe

<com.dd.ErrorLabelLayout
	android:id="@+id/nameErrorLayout"
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
 
	<EditText
		android:id="@+id/editFirsName"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:hint="First name"/>
 
</com.dd.ErrorLabelLayout>

Code

Custom view group which will wrap EditText, show error label and tint EditText background to red or any other color.

res/layout

Remarks

mEditText.getBackground().setColorFilter(mErrorColor, PorterDuff.Mode.SRC_ATOP);

To tint EditText drawable you can use ColorFilter.

public void setError(String text) {
        mErrorLabel.setVisibility(VISIBLE);
        mErrorLabel.setText(text);
        // tint drawable
        mDrawable.setColorFilter(mErrorColor, PorterDuff.Mode.SRC_ATOP);
        // changing focus from EditText to error label, necessary for Android L only
        // EditText background Drawable is not tinted, until EditText remains focus
        mErrorLabel.requestFocus();
    }

EditText background Drawable is not tinted, until EditText remains focus, don't forget to switch focus to other view.

2. 

1. 

Keep it simple ~ 100 lines of code

3. 

Error Label Layout

Links & Resources

Floating label

Recipe

<com.dd.FloatLabelLayout
	android:id="@+id/nameFloatLayout"
	android:layout_width="match_parent"
	android:layout_height="wrap_content">
 
	<EditText
		android:id="@+id/editFirsName"
		android:layout_width="match_parent"
		android:layout_height="wrap_content"
		android:hint="First name"/>
 
</com.dd.FloatLabelLayout>

Code

Custom view group which will wrap EditText, show floating label when EditText is in focus.

res/layout

Float Label Layout

Links & Resources

Dialogs

Recipe

MaterialDialog.Builder build = new MaterialDialog.Builder(this)
        .body(...)
        .title(...)
        .buttonMode(MaterialDialog.ButtonMode.NORMAL)
        .positiveButton("Agree", 
                new MaterialDialog.ButtonClickListener() {
            @Override
            public void onButtonClicked(MaterialDialog dialog, View view) {
                dialog.dismiss();
            }
        })
        .negativeButton("Disagree", 
                new MaterialDialog.ButtonClickListener() {
            @Override
            public void onButtonClicked(MaterialDialog dialog, View view) {
                dialog.dismiss();
            }
        });
MaterialDialog materialDialog = build.build();
materialDialog.show();

Code

Extend Dialog and set custom content view. As a root layout use either CardView or ShadowLayout.

Remarks

As a root view preferable to use ShadowLayout which gives you darker shadow in comparison with CardView.

getWindow().setDimAmount(0.4f);

Material dialog use lighter dim amount value.

2. 

1. 

For buttons use AppCompat.Button.Flat style (see Flat button section).

3. 

For text style use TextAppearance.AppCompat.Body1 and TextAppearance.AppCompat.Title from appcompat-v7 library.

4. 

Material Dialogs

Links & Resources

(in progress)

(in progress)

Snackbar & Toast

Recipe

Snackbar.Builder builder = new Snackbar.Builder(this)
        .timeout(Snackbar.TIMEOUT_MEDIUM)
        .type(Snackbar.Type.SNACKBAR)
        .title(...)
        .buttonColor(Color.BLUE)
        .button("Undo", new Snackbar.ButtonClickListener() {
            @Override
            public void onButtonClicked(Snackbar snackbar, View view) {
                snackbar.cancel();
            }
        });
Snackbar snackbar = builder.create();
snackbar.show();

Code

Create class which will add or remove Snackbar's view to activity decor view over all other components.

Remarks

To show snackbar use activity decor view group.

activity.getWindow().getDecorView();

1. 

For buttons use AppCompat.Button.Flat style (see Flat button section).

2. 

For text style use TextAppearance.AppCompat.Body1 from appcompat-v7 library.

3. 

Snackbar & Toast

Links & Resources

(in progress)

(in progress)

Complex cooking

Pickers

Recipe

DatePickerDialog datePickerDialog = DatePickerDialog.newInstance(this,
        calendar.get(Calendar.YEAR),
        calendar.get(Calendar.MONTH),
        calendar.get(Calendar.DAY_OF_MONTH));
datePickerDialog.setYearRange(1985, 2015);
datePickerDialog.show(getFragmentManager(), null);

TimePickerDialog timePickerDialog = TimePickerDialog.newInstance(this, 
        calendar.get(Calendar.HOUR_OF_DAY), 
        calendar.get(Calendar.MINUTE), true);
timePickerDialog.show(getFragmentManager(), null);

Code

Clone and add as a library project.

https://android.googlesource.com/platform/frameworks/opt/datetimepicker

Chips

Available as third-party library.

Progress

Available as third-party library.

Sliders

Available as third-party library.

Tabs

Available as third-party library.

Summary

Use CardView or ShadowLayout if you need shadow for pre Lollipop.

Almost all third party libraries have issues and only partly imitates Material Design spec behavior. 

1.

2.

Some components are easy to implement - it is worth it to make your own material-support library and reuse it.

3.

@dmytrodanylyk

dmytrodanylyk.com

slides.com/dmytrodanylyk

S

missing-material-components

By Dmytro Danylyk

missing-material-components

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