我正在使用以下代码来选择视频的范围，Trime但我只想30s从总持续时间中选择一部分，(2:30)就像Whatsapp正在做的那样。
参考例子：
以下是我为
RangeSeekBarView
public class LeftRightRangeSeekBarView extends View {
private static final String TAG = LeftRightRangeSeekBarView.class.getSimpleName();
private int mHeightTimeLine;
private List<ThumbObjectClass> mThumbs;
private List<OnRangeSeekBarListener> mListeners;
private float mMaxWidth;
private float mThumbWidth;
private float mThumbHeight;
private int mViewWidth;
private float mPixelRangeMin;
private float mPixelRangeMax;
private float mScaleRangeMax;
private boolean mFirstRun;
private final Paint mShadow = new Paint();
private final Paint mLine = new Paint();
public LeftRightRangeSeekBarView(@NonNull Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public LeftRightRangeSeekBarView(@NonNull Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init() {
mThumbs = ThumbObjectClass.initThumbs(getResources());
mThumbWidth = ThumbObjectClass.getWidthBitmap(mThumbs);
mThumbHeight = ThumbObjectClass.getHeightBitmap(mThumbs);
mScaleRangeMax = 100;
mHeightTimeLine = getContext().getResources().getDimensionPixelOffset(R.dimen.frames_video_height);
setFocusable(true);
setFocusableInTouchMode(true);
mFirstRun = true;
int shadowColor = ContextCompat.getColor(getContext(), R.color.shadow_color);
mShadow.setAntiAlias(true);
mShadow.setColor(shadowColor);
mShadow.setAlpha(177);
int lineColor = ContextCompat.getColor(getContext(), R.color.line_color);
mLine.setAntiAlias(true);
mLine.setColor(lineColor);
}
public void initMaxWidth() {
mMaxWidth = mThumbs.get(1).getPos() - mThumbs.get(0).getPos();
onSeekStop(this, 0, mThumbs.get(0).getVal());
onSeekStop(this, 1, mThumbs.get(1).getVal());
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int minW = getPaddingLeft() + getPaddingRight() + getSuggestedMinimumWidth();
mViewWidth = resolveSizeAndState(minW, widthMeasureSpec, 1);
int minH = getPaddingBottom() + getPaddingTop() + (int) mThumbHeight + mHeightTimeLine;
int viewHeight = 0;
viewHeight = resolveSizeAndState(minH, heightMeasureSpec, 1);
setMeasuredDimension(mViewWidth, viewHeight);
mPixelRangeMin = 0;
mPixelRangeMax = mViewWidth - mThumbWidth;
if (mFirstRun) {
for (int i = 0; i < mThumbs.size(); i++) {
ThumbObjectClass th = mThumbs.get(i);
th.setVal(mScaleRangeMax * i);
th.setPos(mPixelRangeMax * i);
}
onCreate(this, currentThumb, getThumbValue(currentThumb));
mFirstRun = false;
}
}
@Override
protected void onDraw(@NonNull Canvas canvas) {
super.onDraw(canvas);
drawShadow(canvas);
drawThumbs(canvas);
}
private int currentThumb = 0;
@Override
public boolean onTouchEvent(@NonNull MotionEvent ev) {
final ThumbObjectClass mThumb;
final ThumbObjectClass mThumb2;
final float coordinate = ev.getX();
final int action = ev.getAction();
switch (action) {
case MotionEvent.ACTION_DOWN: {
currentThumb = getClosestThumb(coordinate);
if (currentThumb == -1) {
return false;
}
mThumb = mThumbs.get(currentThumb);
Log.e("coordinate", "-down-" + coordinate);
Log.e("coordinate", "-1-" + mThumb);
Log.e("coordinate", "-------------------");
mThumb.setLastTouchX(coordinate);
onSeekStart(this, currentThumb, mThumb.getVal());
return true;
}
case MotionEvent.ACTION_UP: {
if (currentThumb == -1) {
return false;
}
mThumb = mThumbs.get(currentThumb);
Log.e("coordinate", "-down-" + mThumb.getVal());
Log.e("coordinate", "-2-" + mThumb);
onSeekStop(this, currentThumb, mThumb.getVal());
Log.e("coordinate", "-------------------");
return true;
}
case MotionEvent.ACTION_MOVE: {
Log.e("coordinate", "-ACTION_MOVE-" + currentThumb);
mThumb = mThumbs.get(currentThumb);
mThumb2 = mThumbs.get(currentThumb == 0 ? 1 : 0);
Log.e("coordinate", "-mThumb22-" + mThumb);
Log.e("coordinate", "-mThumb2dd-" + mThumb2);
// Calculate the distance moved
final float dx = coordinate - mThumb.getLastTouchX();
final float newX = mThumb.getPos() + dx;
Log.e("coordinate", "-dx-" + dx);
Log.e("coordinate", "-newX-" + newX);
Log.e("coordinate", "-------------------");
if (currentThumb == 0) {
if ((newX + mThumb.getWidthBitmap()) >= mThumb2.getPos()) {
Log.e("coordinate", "-newpos-" + (mThumb2.getPos() - mThumb.getWidthBitmap()));
mThumb.setPos(mThumb2.getPos() - mThumb.getWidthBitmap());
} else if (newX <= mPixelRangeMin) {
Log.e("coordinate", "-mPixelRangeMin-" + mPixelRangeMin);
mThumb.setPos(mPixelRangeMin);
} else {
//Check if thumb is not out of max width
checkPositionThumb(mThumb, mThumb2, dx, true);
// Move the object
Log.e("coordinate", "-mThumb.getPos()+dx-" + (mThumb.getPos() + dx));
mThumb.setPos(mThumb.getPos() + dx);
// Remember this touch position for the next move event
mThumb.setLastTouchX(coordinate);
}
Log.e("coordinate", "-------------------");
} else {
if (newX <= mThumb2.getPos() + mThumb2.getWidthBitmap()) {
Log.e("coordinate", "-second-elese" + (mThumb2.getPos() + mThumb.getWidthBitmap()));
mThumb.setPos(mThumb2.getPos() + mThumb.getWidthBitmap());
} else if (newX >= mPixelRangeMax) {
Log.e("coordinate", "-second-mPixelRangeMax" + mPixelRangeMax);
mThumb.setPos(mPixelRangeMax);
} else {
Log.e("coordinate", "-second-mPixelRangeMax" + (mThumb.getPos() + dx));
Log.e("coordinate", "-second-lasttouch" + coordinate);
//Check if thumb is not out of max width
checkPositionThumb(mThumb2, mThumb, dx, false);
// Move the object
mThumb.setPos(mThumb.getPos() + dx);
// Remember this touch position for the next move event
mThumb.setLastTouchX(coordinate);
}
Log.e("coordinate", "-------------------");
}
setThumbPos(currentThumb, mThumb.getPos());
// Invalidate to request a redraw
invalidate();
return true;
}
}
return false;
}
private void checkPositionThumb(@NonNull ThumbObjectClass mThumbLeft, @NonNull ThumbObjectClass mThumbRight, float dx, boolean isLeftMove) {
if (isLeftMove && dx < 0) {
if ((mThumbRight.getPos() - (mThumbLeft.getPos() + dx)) > mMaxWidth) {
mThumbRight.setPos(mThumbLeft.getPos() + dx + mMaxWidth);
setThumbPos(1, mThumbRight.getPos());
}
} else if (!isLeftMove && dx > 0) {
if (((mThumbRight.getPos() + dx) - mThumbLeft.getPos()) > mMaxWidth) {
mThumbLeft.setPos(mThumbRight.getPos() + dx - mMaxWidth);
setThumbPos(0, mThumbLeft.getPos());
}
}
}
private int getUnstuckFrom(int index) {
int unstuck = 0;
float lastVal = mThumbs.get(index).getVal();
for (int i = index - 1; i >= 0; i--) {
ThumbObjectClass th = mThumbs.get(i);
if (th.getVal() != lastVal)
return i + 1;
}
return unstuck;
}
private float pixelToScale(int index, float pixelValue) {
float scale = (pixelValue * 100) / mPixelRangeMax;
if (index == 0) {
float pxThumb = (scale * mThumbWidth) / 100;
return scale + (pxThumb * 100) / mPixelRangeMax;
} else {
float pxThumb = ((100 - scale) * mThumbWidth) / 100;
return scale - (pxThumb * 100) / mPixelRangeMax;
}
}
private float scaleToPixel(int index, float scaleValue) {
float px = (scaleValue * mPixelRangeMax) / 100;
if (index == 0) {
float pxThumb = (scaleValue * mThumbWidth) / 100;
return px - pxThumb;
} else {
float pxThumb = ((100 - scaleValue) * mThumbWidth) / 100;
return px + pxThumb;
}
}
private void calculateThumbValue(int index) {
if (index < mThumbs.size() && !mThumbs.isEmpty()) {
ThumbObjectClass th = mThumbs.get(index);
th.setVal(pixelToScale(index, th.getPos()));
onSeek(this, index, th.getVal());
}
}
private void calculateThumbPos(int index) {
if (index < mThumbs.size() && !mThumbs.isEmpty()) {
ThumbObjectClass th = mThumbs.get(index);
th.setPos(scaleToPixel(index, th.getVal()));
}
}
private float getThumbValue(int index) {
return mThumbs.get(index).getVal();
}
public void setThumbValue(int index, float value) {
mThumbs.get(index).setVal(value);
calculateThumbPos(index);
// Tell the view we want a complete redraw
invalidate();
}
private void setThumbPos(int index, float pos) {
mThumbs.get(index).setPos(pos);
calculateThumbValue(index);
// Tell the view we want a complete redraw
invalidate();
}
private int getClosestThumb(float coordinate) {
int closest = -1;
if (!mThumbs.isEmpty()) {
for (int i = 0; i < mThumbs.size(); i++) {
// Find thumb closest to x coordinate
final float tcoordinate = mThumbs.get(i).getPos() + mThumbWidth;
if (coordinate >= mThumbs.get(i).getPos() && coordinate <= tcoordinate) {
closest = mThumbs.get(i).getIndex();
}
}
}
return closest;
}
private void drawShadow(@NonNull Canvas canvas) {
if (!mThumbs.isEmpty()) {
for (ThumbObjectClass th : mThumbs) {
if (th.getIndex() == 0) {
final float x = th.getPos() + getPaddingLeft();
if (x > mPixelRangeMin) {
Rect mRect = new Rect((int) mThumbWidth, 0, (int) (x + mThumbWidth), mHeightTimeLine);
canvas.drawRect(mRect, mShadow);
}
} else {
final float x = th.getPos() - getPaddingRight();
if (x < mPixelRangeMax) {
Rect mRect = new Rect((int) x, 0, (int) (mViewWidth - mThumbWidth), mHeightTimeLine);
canvas.drawRect(mRect, mShadow);
}
}
}
}
}
private void drawThumbs(@NonNull Canvas canvas) {
if (!mThumbs.isEmpty()) {
for (ThumbObjectClass th : mThumbs) {
if (th.getIndex() == 0) {
canvas.drawBitmap(th.getBitmap(), th.getPos() + getPaddingLeft(), getPaddingTop() + mHeightTimeLine, null);
} else {
canvas.drawBitmap(th.getBitmap(), th.getPos() - getPaddingRight(), getPaddingTop() + mHeightTimeLine, null);
}
}
}
}
public void addOnRangeSeekBarListener(OnRangeSeekBarListener listener) {
if (mListeners == null) {
mListeners = new ArrayList<>();
}
mListeners.add(listener);
}
private void onCreate(LeftRightRangeSeekBarView rangeSeekBarView, int index, float value) {
if (mListeners == null)
return;
for (OnRangeSeekBarListener item : mListeners) {
item.onCreate(rangeSeekBarView, index, value);
}
}
private void onSeek(LeftRightRangeSeekBarView rangeSeekBarView, int index, float value) {
if (mListeners == null)
return;
for (OnRangeSeekBarListener item : mListeners) {
item.onSeek(rangeSeekBarView, index, value);
}
}
private void onSeekStart(LeftRightRangeSeekBarView rangeSeekBarView, int index, float value) {
if (mListeners == null)
return;
for (OnRangeSeekBarListener item : mListeners) {
item.onSeekStart(rangeSeekBarView, index, value);
}
}
private void onSeekStop(LeftRightRangeSeekBarView rangeSeekBarView, int index, float value) {
if (mListeners == null)
return;
for (OnRangeSeekBarListener item : mListeners) {
item.onSeekStop(rangeSeekBarView, index, value);
}
}
public List<ThumbObjectClass> getThumbs() {
return mThumbs;
}}