前言
因为最近的项目需要使用录音功能，开始的想法是Button+OnTouchListener+Dialog实现，在大部分手机中都没问题，只有MI8会偶尔无法触发MotionEvent.ACTION_UP，导致程序异常。所以就自己写了个自定义View来实现，主要也是通过监听OnTouchListener+Dialog来实现。这里只实现了自定义View，并不涉及录音和播放。效果图如下：
代码
代码并不复杂，配合注释应该很容易理解。
/** * Author ： BlackHao * Time : 2019/4/18 14:03 * Description : 自定义录音按钮布局界面 */public class PressedView extends View implements View.OnTouchListener { private int normalRes; private String normalText = ""; private int pressedRes; private String pressedText = ""; // private Paint paint; private Rect rect; //当前是否是按下状态 private boolean isPressed = false; // private PressCallback callback; //按下的位置y坐标 private int pressedY = 0; //当前是否是outSize private boolean isOutSize = false; //字体dp大小 private static int TEXT_SIZE = 20; //对话框相关 private Dialog soundVolumeDialog = null; //音量图片 private ImageView soundVolumeImg = null; //对话框背景 private RelativeLayout soundVolumeLayout = null; public PressedView(Context context) { super(context); init(); } public PressedView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); init(); } public PressedView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { // paint = new Paint(); paint.setAntiAlias(true); paint.setTextSize(DensityUtil.dip2px(getContext(), TEXT_SIZE)); paint.setColor(Color.WHITE); rect = new Rect(); // normalRes = R.drawable.blue_btn_bk; normalText = "按住 说话"; pressedRes = R.drawable.red_btn_bk; pressedText = "松开 结束"; // setOnTouchListener(this); // initSoundVolumeDlg(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); rect.set(0, 0, getWidth(), getHeight()); if (!isPressed) { setBackgroundResource(normalRes); drawTextOnRect(canvas, rect, normalText); } else { setBackgroundResource(pressedRes); drawTextOnRect(canvas, rect, pressedText); } } @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: pressedY = (int) event.getRawY(); isOutSize = false; if (!isPressed) { isPressed = true; postInvalidate(); if (callback != null) { //回调 callback.onStartRecord(); //按下，弹出对话框 soundVolumeImg.setImageResource(R.mipmap.sound_volume_01); soundVolumeImg.setVisibility(View.VISIBLE); soundVolumeLayout.setBackgroundResource(R.mipmap.sound_volume_default_bk); soundVolumeDialog.show(); } } break; case MotionEvent.ACTION_UP: if (isPressed) { isPressed = false; postInvalidate(); if (callback != null) { int upY = (int) event.getRawY(); if (pressedY - upY < getHeight()) { //录音结束 if (soundVolumeDialog.isShowing()) { soundVolumeDialog.dismiss(); } callback.onStopRecord(); } else { //录音取消 if (soundVolumeDialog.isShowing()) { soundVolumeDialog.dismiss(); } callback.onCancelRecord(); } } } break; case MotionEvent.ACTION_MOVE: if (isPressed && callback != null) { int upY = (int) event.getRawY(); if (pressedY - upY < getHeight()) { if (isOutSize) { isOutSize = false; soundVolumeLayout.setBackgroundResource(R.mipmap.sound_volume_default_bk); } } else { if (!isOutSize) { isOutSize = true; soundVolumeLayout.setBackgroundResource(R.mipmap.sound_volume_cancel_bk); } } } break; } return true; } public void setCallback(PressCallback callback) { this.callback = callback; } public interface PressCallback { //开始录音 void onStartRecord(); //停止录音 void onStopRecord(); //取消录音 void onCancelRecord(); } /** * 在指定矩形中间drawText * * @param canvas 画布 * @param targetRect 指定矩形 * @param text 需要绘制的Text */ private void drawTextOnRect(Canvas canvas, Rect targetRect, String text) { Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt(); // 获取baseLine int baseline = targetRect.top + (targetRect.bottom - targetRect.top - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top; // 下面这行是实现水平居中，drawText对应改为传入targetRect.centerX() paint.setTextAlign(Paint.Align.CENTER); canvas.drawText(text, targetRect.centerX(), baseline, paint); } /** * 初始化音量信息对话框 */ private void initSoundVolumeDlg() { soundVolumeDialog = new Dialog(getContext(), R.style.SoundVolumeStyle); soundVolumeDialog.requestWindowFeature(Window.FEATURE_NO_TITLE); soundVolumeDialog.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); soundVolumeDialog.setContentView(R.layout.tt_sound_volume_dialog); soundVolumeDialog.setCanceledOnTouchOutside(true); soundVolumeImg = (ImageView) soundVolumeDialog.findViewById(R.id.sound_volume_img); soundVolumeLayout = (RelativeLayout) soundVolumeDialog.findViewById(R.id.sound_volume_bk); } /** * 根据分贝值设置录音时的音量动画 */ public void setVolume(int voiceValue) { if (voiceValue < 200.0) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_01); } else if (voiceValue > 200.0 && voiceValue < 600) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_02); } else if (voiceValue > 600.0 && voiceValue < 1200) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_03); } else if (voiceValue > 1200.0 && voiceValue < 2400) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_04); } else if (voiceValue > 2400.0 && voiceValue < 10000) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_05); } else if (voiceValue > 10000.0 && voiceValue < 28000.0) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_06); } else if (voiceValue > 28000.0) { soundVolumeImg.setImageResource(R.mipmap.sound_volume_07); } }}
结语
源码github地址：仿微信语音界面
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本文标题: Android自定义View实现微信语音界面
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