这几天有在学习Jetpack中CameraX的内容，在拍摄视频的时候想着做一个自定义带有进度条的可长按控件，用来显示拍摄进度，故记录下来与大家分享！效果如下： (篇幅过长是因为有代码解
这几天有在学习Jetpack中CameraX的内容，在拍摄视频的时候想着做一个自定义带有进度条的可长按控件，用来显示拍摄进度，故记录下来与大家分享！效果如下：
(篇幅过长是因为有代码解析过程，可直接到最后查看完整代码)
这个控件较为简易，从效果中可以看出，控件模拟了单击拍照，长按可以录制视频的功能，中途松手或者时间到都可以停止录制
思路很简单，使用简单的画笔工具就可以完成这个控件
- 继承自View
- 定义自定义属性并获取
- 定义填充样式的画笔
- onMeasure中测量大小，onDraw中绘制圆与扇形
- 监听长按监听开始定时器并刷新画布，监听触摸事件进行结束的回调
以上就是全部的思路了，代码拆解如下：
（一）继承自View并实现构造方法，代码如下：
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;//计时器
private AtomicInteger mCount = new AtomicInteger(0);
private MyClickListener mMyClickListener;
private boolean mIsFinish = true;
private long mStartTime;//点击的时间
private long mEndTime;//点击结束的时间
private int mMaxSeconds;
private int mDelayMilliseconds;
private int mAnnulusColor;
private float mAnnulusWidth;
public interface MyClickListener {
void longClickFinish();//长按结束
void singleClickFinish();//单击结束
}
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）定义并获取自定义属性，属性以及获取属性代码如下：
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 最大的秒数
mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
//annulusWidth 圆环的宽度
mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
//annulusColor 圆环的颜色
DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
//delayMilliseconds 进度条隔多少时间走一次,值越小走的越快，显得更流畅
mDelayMilliseconds = typedArray.getInt(R.styleable.LongClickView_delayMilliseconds, DEFAULT_RATE);
}
(三)定义画笔工具 的代码如下:
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);
...//这里是长按监听
}
(四)onMeasure中测量大小，onDraw中绘制圆与扇形，代码如下：
onMeasure中，如果没有定义实际宽高就会使用父组件的宽高，如果有实际宽高便会使用自己的宽高
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mWidthSize = MeasureSpec.getSize(widthMeasureSpec);
setMeasuredDimension(mWidthSize, mWidthSize);
}
onDraw中，一共有三层圆形填充绘制以及一层扇形填充绘制，先绘制最外层的灰色圆形，再根据此时的进度绘制一定角度的扇形，然后覆盖一层灰色的圆形，最后在覆盖上一层白色的中心圆，并且在绘制过程以及绘制结束时的中心圆半径不同。代码如下：
@Override
protected void onDraw(Canvas canvas) {
canvas.drawCircle(mWidthSize / 2, mWidthSize / 2, mWidthSize / 2, mBigCirclePaint);//最外层的填充圆
RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//进度扇形
if (mCount.get() > 0) {
//求出每一次定时器执行所绘制的扇形度数
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);//中间一层灰色的圆
//最后绘制中心圆
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）监听长按监听开始定时器并刷新画布，监听触摸事件进行结束的回调，定时器使用的是Timer类，当时间超过自定义的最大秒数时就会自动停止，并定时刷新画布,代码如下:
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);
}
将定时器停止与停止后的判断逻辑放在AsyncTask中编写，确保定时器不会继续处理逻辑之后再做判断
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) {
//使用时间戳的差来判断是单击或者长按
if (mEndTime - mStartTime > 1000) {
//防止在自动结束后松开手指又重新调用了一次长按结束的回调
if (!mIsFinish) {
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
} else {
//若是单击就清除进度条
mCount.set(0);
invalidate();
if (mMyClickListener != null) {
mMyClickListener.singleClickFinish();
}
}
mIsFinish = true;
}
}
结束后的回调类代码如下:
public interface MyClickListener {
void longClickFinish();//长按结束
void singleClickFinish();//单击结束
}
最后，完整的代码如下，自定义属性上方有贴出来代码：
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;//计时器
private AtomicInteger mCount = new AtomicInteger(0);
private MyClickListener mMyClickListener;
private boolean mIsFinish = true;
private long mStartTime;//点击的时间
private long mEndTime;//点击结束的时间
private int mMaxSeconds;
private int mDelayMilliseconds;
private int mAnnulusColor;
private float mAnnulusWidth;
public interface MyClickListener {
void longClickFinish();//长按结束
void singleClickFinish();//单击结束
}
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 最大的秒数
mMaxSeconds = typedArray.getInt(R.styleable.LongClickView_maxSeconds, DEFAULT_MAX_SECONDS);
//annulusWidth 圆环的宽度
mAnnulusWidth = typedArray.getInt(R.styleable.LongClickView_annulusWidth, DEFAULT_ANNULUS_WIDTH);
//annulusColor 圆环的颜色
DEFAULT_ANNULUS_COLOR = context.getResources().getColor(R.color.color_grey);
mAnnulusColor = typedArray.getColor(R.styleable.LongClickView_annulusColor, DEFAULT_ANNULUS_COLOR);
//delayMilliseconds 进度条隔多少时间走一次,值越小走的越快，显得更流畅
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);//最外层的填充圆
RectF rectF = new RectF(0, 0, mWidthSize, mWidthSize);//进度扇形
if (mCount.get() > 0) {
//求出每一次定时器执行所绘制的扇形度数
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);//中间一层灰色的圆
//最后绘制中心圆
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) {
//使用时间戳的差来判断是单击或者长按
if (mEndTime - mStartTime > 1000) {
//防止在结束后松开手指有重新调用了一次长按结束的回调
if (!mIsFinish) {
if (mMyClickListener != null) {
mMyClickListener.longClickFinish();
}
}
} else {
mCount.set(0);
invalidate();
if (mMyClickListener != null) {
mMyClickListener.singleClickFinish();
}
}
mIsFinish = true;
}
}
}
使用的代码如下：
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="长按录制视频，单击拍照"
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, "长按结束", Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void singleClickFinish() {
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(LongClickViewActivity.this, "单击结束", Toast.LENGTH_SHORT).show();
}
});
}
});
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