Android implements circular progress bar

1. Project requirements

Progress bars are often used in projects. They are very simple. Here is a simple summary and implementation.

2. Implement controls

ProgressBar

3. Implement the code

1. Horizontal progress bar

xml layout code:

<ProgressBar
            android:id="@+id/rocketProgressBar"
            style="@style/Widget.AppCompat.ProgressBar.Horizontal"
            android:layout_width="match_parent"
            android:layout_height="8dp"
            android:layout_centerHorizontal="true"
            android:layout_marginHorizontal="60dp"
            android:layout_marginBottom="80dp"
            android:progressDrawable="@drawable/mmmmmm"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            tools:progress="65" />

style attribute: determines what type of progress bar it is

progressDrawable property: Determine the background of the progress bar, the color of the progress bar, etc.

mmmmmm.xml: drawable file code

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <solid android:color="#6DC9FF"/>
                <corners android:radius="4dp" />
            </shape>
        </clip>
    </item>

    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="4dp" />
            <solid android:color="#4D6DC9FF" />
        </shape>
    </item>


</layer-list>

The properties inside are literal

Control code: For example, if I want to add a two-second progress bar to the opening page and then jump to the next interface, I can implement it like this:

lateinit var countDownTimer: CountDownTimer

countDownTimer = object : CountDownTimer(2000L, 200) {
            override fun onTick(p0: Long) {
                mBinding.rocketProgressBar.progress = ((2000 - p0) / 20).toInt() + 1
            }

            override fun onFinish() {
                val intent = Intent(this@PhoneActivity, ComputerActivity::class.java)
                startActivity(intent)
                finish()
            }
        }
        countDownTimer.start()

2. Ring-shaped progress bar

xml code:

            <ProgressBar
                android:id="@+id/circularProgressBar"
                style="?android:attr/progressBarStyleHorizontal"
                android:layout_width="150dp"
                android:layout_height="150dp"
                android:layout_gravity="center"
                android:indeterminate="false"
                android:max="100"
                android:progressDrawable="@drawable/aaa"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                tools:progress="80" />

aaa drawable file 

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/progress">
        <shape
            android:shape="ring"
            android:innerRadius="54dp"
            android:thickness="2dp">
            <solid android:color="#55CCFF" />
        </shape>
    </item>
</layer-list>

You can see that there is a big difference between here and above.