Android自定義帶有圓形進度條的可長按控件功能
這幾天有在學習Jetpack中CameraX的內容，在拍攝視頻的時候想著做一個自定義帶有進度條的可長按控件，用來顯示拍攝進度，故記錄下來與大傢分享！效果如下：
(篇幅過長是因為有代碼解析過程，可直接到最後查看完整代碼)
這個控件較為簡易，從效果中可以看出，控件模擬瞭單擊拍照，長按可以錄制視頻的功能，中途松手或者時間到都可以停止錄制
思路很簡單，使用簡單的畫筆工具就可以完成這個控件
- 繼承自View
- 定義自定義屬性並獲取
- 定義填充樣式的畫筆
- onMeasure中測量大小，onDraw中繪制圓與扇形
- 監聽長按監聽開始定時器並刷新畫佈，監聽觸摸事件進行結束的回調
以上就是全部的思路瞭，代碼拆解如下：
（一）繼承自View並實現構造方法，代碼如下：
public class LongClickView extends View {
public int DEFAULT_MAX_SECONDS = 15;
public int DEFAULT_ANNULUS_WIDTH = 5;
public int DEFAULT_ANNULUS_COLOR;
public int DEFAULT_RATE = 50;
private Paint mSmallCirclePaint;
private Paint mMiddenCirclePaint;
private Paint mBigCirclePaint;
private Paint mAngleCirclePaint;
private int mWidthSize;
private Timer mTimer;//計時器
private AtomicInteger mCount = new AtomicInteger(0);
private MyClickListener mMyClickListener;
private boolean mIsFinish = true;
private long mStartTime;//點擊的時間
private long mEndTime;//點擊結束的時間
private int mMaxSeconds;
private int mDelayMilliseconds;
private int mAnnulusColor;
private float mAnnulusWidth;
public interface MyClickListener {
void longClickFinish();//長按結束
void singleClickFinish();//單擊結束
}
public void setMyClickListener(MyClickListener myClickListener) {
mMyClickListener = myClickListener;
}
public LongClickView(Context context) {
this(context, null);
}
public LongClickView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public LongClickView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
getAttrs(context, attrs);
initView();
}
}
（二）定義並獲取自定義屬性，屬性以及獲取屬性代碼如下：
attr_long_click_view.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="LongClickView">
<attr name="maxSeconds" format="integer" />
<attr name="annulusWidth" format="integer" />
<attr name="annulusColor" format="color" />
<attr name="delayMilliseconds" format="integer" />
</declare-styleable>
</resources>
private void getAttrs(Context context, @Nullable AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.LongClickView);
//maxSeconds 最大的秒數
mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
//annulusWidth 圓環的寬度
mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
//annulusColor 圓環的顏色
DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
//delayMilliseconds 進度條隔多少時間走一次,值越小走的越快，顯得更流暢
mDelayMilliseconds = typedArray.getInt(R.styleable.LongClickView_delayMilliseconds, DEFAULT_RATE);
}
(三)定義畫筆工具 的代碼如下:
private void initView() {
mBigCirclePaint = new Paint();
mSmallCirclePaint = new Paint();
mMiddenCirclePaint = new Paint();
mAngleCirclePaint = new Paint();
mBigCirclePaint.setStyle(Paint.Style.FILL);
mBigCirclePaint.setColor(Color.LTGRAY);
mBigCirclePaint.setAntiAlias(true);
mBigCirclePaint.setStrokeWidth(5);
mSmallCirclePaint.setStrokeWidth(5);
mSmallCirclePaint.setAntiAlias(true);
mSmallCirclePaint.setColor(Color.WHITE);
mSmallCirclePaint.setStyle(Paint.Style.FILL);
mMiddenCirclePaint.setStrokeWidth(5);
mMiddenCirclePaint.setAntiAlias(true);
mMiddenCirclePaint.setColor(Color.LTGRAY);
mMiddenCirclePaint.setStyle(Paint.Style.FILL);
mAngleCirclePaint.setStrokeWidth(5);
mAngleCirclePaint.setAntiAlias(true);
mAngleCirclePaint.setColor(mAnnulusColor);
mAngleCirclePaint.setStyle(Paint.Style.FILL);
...//這裡是長按監聽
}
(四)onMeasure中測量大小，onDraw中繪制圓與扇形，代碼如下：
onMeasure中，如果沒有定義實際寬高就會使用父組件的寬高，如果有實際寬高便會使用自己的寬高
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidthSize = MeasureSpec.getSize(widthMeasureSpec);
setMeasuredDimension(mWidthSize, mWidthSize);
}
onDraw中，一共有三層圓形填充繪制以及一層扇形填充繪制，先繪制最外層的灰色圓形，再根據此時的進度繪制一定角度的扇形，然後覆蓋一層灰色的圓形，最後在覆蓋上一層白色的中心圓，並且在繪制過程以及繪制結束時的中心圓半徑不同。代碼如下：
@Override
protected void onDraw(Canvas canvas) {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2, mBigCirclePaint);//最外層的填充圓
RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//進度扇形
if (mCount.get() > 0) {
//求出每一次定時器執行所繪制的扇形度數
float perAngle = 360f / mMaxSeconds / (1000f / mDelayMilliseconds);
canvas.drawArc(rectF, 0, perAngle * mCount.get(), true, mAngleCirclePaint);
}
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mMiddenCirclePaint);//中間一層灰色的圓
//最後繪制中心圓
if (mIsFinish) {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mSmallCirclePaint);
} else {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 8, mSmallCirclePaint);
}
super.onDraw(canvas);
}
（五）監聽長按監聽開始定時器並刷新畫佈，監聽觸摸事件進行結束的回調，定時器使用的是Timer類，當時間超過自定義的最大秒數時就會自動停止，並定時刷新畫佈,代碼如下:
this.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
mIsFinish = false;
mCount.set(0);
mTimer = new Timer();
mTimer.schedule(new TimerTask() {
@Override
public void run() {
mCount.addAndGet(1);
invalidate();
if (mCount.get() * mDelayMilliseconds >= mMaxSeconds * 1000) {
mCount.set(0);
this.cancel();
invalidate();
mIsFinish = true;
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
}
}, 0, mDelayMilliseconds);
return true;
}
});
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
mEndTime = System.currentTimeMillis();
new MyAsyncTask().execute();
} else if (event.getAction() == MotionEvent.ACTION_DOWN) {
mStartTime = System.currentTimeMillis();
}
return super.onTouchEvent(event);
}
將定時器停止與停止後的判斷邏輯放在AsyncTask中編寫，確保定時器不會繼續處理邏輯之後再做判斷
public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
if (mTimer != null) {
mTimer.cancel();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
//使用時間戳的差來判斷是單擊或者長按
if (mEndTime - mStartTime > 1000) {
//防止在自動結束後松開手指又重新調用瞭一次長按結束的回調
if (!mIsFinish) {
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
} else {
//若是單擊就清除進度條
mCount.set(0);
invalidate();
if (mMyClickListener != null) {
mMyClickListener.singleClickFinish();
}
}
mIsFinish = true;
}
}
結束後的回調類代碼如下:
public interface MyClickListener {
void longClickFinish();//長按結束
void singleClickFinish();//單擊結束
}
最後，完整的代碼如下，自定義屬性上方有貼出來代碼：
public class LongClickView extends View {
public int DEFAULT_MAX_SECONDS = 15;
public int DEFAULT_ANNULUS_WIDTH = 5;
public int DEFAULT_ANNULUS_COLOR;
public int DEFAULT_RATE = 50;
private Paint mSmallCirclePaint;
private Paint mMiddenCirclePaint;
private Paint mBigCirclePaint;
private Paint mAngleCirclePaint;
private int mWidthSize;
private Timer mTimer;//計時器
private AtomicInteger mCount = new AtomicInteger(0);
private MyClickListener mMyClickListener;
private boolean mIsFinish = true;
private long mStartTime;//點擊的時間
private long mEndTime;//點擊結束的時間
private int mMaxSeconds;
private int mDelayMilliseconds;
private int mAnnulusColor;
private float mAnnulusWidth;
public interface MyClickListener {
void longClickFinish();//長按結束
void singleClickFinish();//單擊結束
}
public void setMyClickListener(MyClickListener myClickListener) {
mMyClickListener = myClickListener;
}
public LongClickView(Context context) {
this(context, null);
}
public LongClickView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public LongClickView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
getAttrs(context, attrs);
initView();
}
private void getAttrs(Context context, @Nullable AttributeSet attrs) {
TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.LongClickView);
//maxSeconds 最大的秒數
mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
//annulusWidth 圓環的寬度
mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
//annulusColor 圓環的顏色
DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
//delayMilliseconds 進度條隔多少時間走一次,值越小走的越快，顯得更流暢
mDelayMilliseconds = typedArray.getInt(R.styleable.LongClickView_delayMilliseconds, DEFAULT_RATE);
}
private static final String TAG = "LongClickView";
private void initView() {
mBigCirclePaint = new Paint();
mSmallCirclePaint = new Paint();
mMiddenCirclePaint = new Paint();
mAngleCirclePaint = new Paint();
mBigCirclePaint.setStyle(Paint.Style.FILL);
mBigCirclePaint.setColor(Color.LTGRAY);
mBigCirclePaint.setAntiAlias(true);
mBigCirclePaint.setStrokeWidth(5);
mSmallCirclePaint.setStrokeWidth(5);
mSmallCirclePaint.setAntiAlias(true);
mSmallCirclePaint.setColor(Color.WHITE);
mSmallCirclePaint.setStyle(Paint.Style.FILL);
mMiddenCirclePaint.setStrokeWidth(5);
mMiddenCirclePaint.setAntiAlias(true);
mMiddenCirclePaint.setColor(Color.LTGRAY);
mMiddenCirclePaint.setStyle(Paint.Style.FILL);
mAngleCirclePaint.setStrokeWidth(5);
mAngleCirclePaint.setAntiAlias(true);
mAngleCirclePaint.setColor(mAnnulusColor);
mAngleCirclePaint.setStyle(Paint.Style.FILL);
this.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
mIsFinish = false;
mCount.set(0);
mTimer = new Timer();
mTimer.schedule(new TimerTask() {
@Override
public void run() {
mCount.addAndGet(1);
invalidate();
if (mCount.get() * mDelayMilliseconds >= mMaxSeconds * 1000) {
mCount.set(0);
this.cancel();
invalidate();
mIsFinish = true;
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
}
}, 0, mDelayMilliseconds);
return true;
}
});
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidthSize = MeasureSpec.getSize(widthMeasureSpec);
setMeasuredDimension(mWidthSize, mWidthSize);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2, mBigCirclePaint);//最外層的填充圓
RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//進度扇形
if (mCount.get() > 0) {
//求出每一次定時器執行所繪制的扇形度數
float perAngle = 360f / mMaxSeconds / (1000f / mDelayMilliseconds);
canvas.drawArc(rectF, 0, perAngle * mCount.get(), true, mAngleCirclePaint);
}
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mMiddenCirclePaint);//中間一層灰色的圓
//最後繪制中心圓
if (mIsFinish) {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2 - mAnnulusWidth, mSmallCirclePaint);
} else {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 8, mSmallCirclePaint);
}
super.onDraw(canvas);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP) {
mEndTime = System.currentTimeMillis();
new MyAsyncTask().execute();
} else if (event.getAction() == MotionEvent.ACTION_DOWN) {
mStartTime = System.currentTimeMillis();
}
return super.onTouchEvent(event);
}
public class MyAsyncTask extends AsyncTask<Void, Void, Void> {
@Override
protected Void doInBackground(Void... voids) {
if (mTimer != null) {
mTimer.cancel();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
//使用時間戳的差來判斷是單擊或者長按
if (mEndTime - mStartTime > 1000) {
//防止在結束後松開手指有重新調用瞭一次長按結束的回調
if (!mIsFinish) {
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
} else {
mCount.set(0);
invalidate();
if (mMyClickListener != null) {
mMyClickListener.singleClickFinish();
}
}
mIsFinish = true;
}
}
}
使用的代碼如下：
activity_long_click_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical">
<com.example.customerview.long_click_view.LongClickView
android:id="@+id/long_click_view"
android:layout_width="100dp"
android:layout_height="wrap_content"
app:annulusColor="@color/color_2196F3"
app:annulusWidth="20"
app:delayMilliseconds="40"
app:maxSeconds="4" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:text="長按錄制視頻，單擊拍照"
android:textColor="@color/colorBlack"
android:textSize="20dp" />
</LinearLayout>
LongClickViewActivity.java
mLongClickView.setMyClickListener(new LongClickView.MyClickListener() {
@Override
public void longClickFinish() {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(LongClickViewActivity.this, "長按結束", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void singleClickFinish() {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(LongClickViewActivity.this, "單擊結束", Toast.LENGTH_SHORT).show();
}
});
}
});
到此這篇關於Android自定義帶有圓形進度條的可長按控件功能的文章就介紹到這瞭,更多相關Android圓形進度條內容請搜索WalkonNet以前的文章或繼續瀏覽下面的相關文章希望大傢以後多多支持WalkonNet！
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