Android高仿iOS Messages录音操作按钮
目录
前面的2次开发，分别完成了实现录音和播放以及相对应的波形。
这次的开发目标是解决录音操作按钮。
一、目标
实现录音操作按钮，为神马笔记实现录音功能做准备。
二、功能分析
iOS Messages录音按钮可以通过上下滑动选择不同的功能。
其中一个使用场景：
- 长按录音按钮启动录音功能
- 向上滑动到发送按钮，发送语音
- 向下滑动到停止按钮，停止录音
- 滑动到按钮外部，不进行任何操作
| 截图 | 描述 |
|---|---|
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录音按钮及按下状态 |
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发送按钮及按下状态 |
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播放按钮及按下状态 |
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暂停按钮及按下状态 |
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三、实现效果
没有动态效果，看起来跟LinearLayout或者其他的控件容器毫无差别。
进行触控操作，则可以通过上下滑动选择不同的功能。
四、实现过程
因为布局方式与LinearLayout非常一致，因此选择LinearLayout为蓝本，然后重新编写触控事件。
触控事件的处理方式则参考ScrollView，因为无需处理滚动，实现非常之简单。
使用时，需要将子控件clickable属性设置为true，才能反应控件状态。
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public class ActionLayout extends LinearLayout {
private static final String TAG = "ActionLayout";
View actionView;
View.OnClickListener onClickListener;
/**
* Sentinel value for no current active pointer.
* Used by {@link #mActivePointerId}.
*/
private static final int INVALID_POINTER = -1;
/**
* ID of the active pointer. This is used to retain consistency during
* drags/flings if multiple pointers are used.
*/
private int mActivePointerId = INVALID_POINTER;
public ActionLayout(Context context) {
this(context, null);
}
public ActionLayout(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public ActionLayout(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
this(context, attrs, defStyleAttr, 0);
}
public ActionLayout(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
super(context, attrs, defStyleAttr, defStyleRes);
}
@Override
public void setOnClickListener(@Nullable OnClickListener l) {
this.onClickListener = l;
super.setOnClickListener(l);
}
@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
super.onInterceptTouchEvent(ev);
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
mActivePointerId = ev.getPointerId(0);
this.updateAction(ev);
break;
}
case MotionEvent.ACTION_MOVE: {
if (mActivePointerId == INVALID_POINTER) {
mActivePointerId = ev.getPointerId(0);
}
this.updateAction(ev);
break;
}
case MotionEvent.ACTION_CANCEL: {
this.mActivePointerId = INVALID_POINTER;
this.actionView = null;
break;
}
case MotionEvent.ACTION_UP: {
this.fireAction();
this.mActivePointerId = INVALID_POINTER;
this.actionView = null;
break;
}
case MotionEvent.ACTION_POINTER_UP: {
onSecondaryPointerUp(ev);
this.updateAction(ev);
break;
}
}
return isClickable() || (getChildCount() != 0);
}
@Override
public boolean onTouchEvent(MotionEvent ev) {
final int actionMasked = ev.getActionMasked();
switch (actionMasked) {
case MotionEvent.ACTION_DOWN: {
mActivePointerId = ev.getPointerId(0);
updateAction(ev);
break;
}
case MotionEvent.ACTION_MOVE: {
if (mActivePointerId == INVALID_POINTER) {
mActivePointerId = ev.getPointerId(0);
}
updateAction(ev);
break;
}
case MotionEvent.ACTION_UP: {
fireAction();
this.mActivePointerId = INVALID_POINTER;
this.actionView = null;
break;
}
case MotionEvent.ACTION_CANCEL: {
mActivePointerId = INVALID_POINTER;
this.actionView = null;
break;
}
case MotionEvent.ACTION_POINTER_DOWN: {
final int index = ev.getActionIndex();
this.mActivePointerId = ev.getPointerId(index);
this.updateAction(ev);
break;
}
case MotionEvent.ACTION_POINTER_UP: {
onSecondaryPointerUp(ev);
this.updateAction(ev);
break;
}
}
return isClickable() || (getChildCount() != 0);
}
void fireAction() {
if (actionView == null) {
return;
}
actionView.setPressed(false);
if (onClickListener != null) {
onClickListener.onClick(actionView);
}
}
void updateAction(MotionEvent ev) {
final int activePointerIndex = ev.findPointerIndex(mActivePointerId);
if (activePointerIndex == -1) {
Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent");
return;
}
final float x = ev.getX(activePointerIndex);
final float y = ev.getY(activePointerIndex);
View view = findChildViewUnder(x, y);
if (view != null && view.getVisibility() != View.VISIBLE) {
view = null;
}
if (actionView == view) {
return;
}
if (actionView != null) {
actionView.setPressed(false);
}
if (view != null) {
view.setPressed(true);
}
this.actionView = view;
}
View findChildViewUnder(float x, float y) {
final int count = this.getChildCount();
for (int i = count - 1; i >= 0; i--) {
View child = this.getChildAt(i);
final float translationX = child.getTranslationX();
final float translationY = child.getTranslationY();
if (x >= child.getLeft() + translationX
&& x <= child.getRight() + translationX
&& y >= child.getTop() + translationY
&& y <= child.getBottom() + translationY) {
return child;
}
}
return null;
}
void onSecondaryPointerUp(MotionEvent ev) {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >>
MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
// TODO: Make this decision more intelligent.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mActivePointerId = ev.getPointerId(newPointerIndex);
}
}
}
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五、开发过程回顾
明确开发目标，选择LinearLayout和ScrollView为蓝本进行改造。
还从RecyclerView拿了点代码来用。
六、接下来
继续朝录音编辑器迈进。
七、Finally
尔时。世尊而说偈言。
若以色见我。 以音声求我。 是人行邪道。 不能见如来。