这两天有个任务，说是要写一个QQ音乐播放器歌词的那种效果，毕竟刚学自定义View,没有什么思路，然后就Google.写了一个歌词效果，效果图在后面,下面是我整理的代码。
首先实现这种效果有两种方式
1.自定义View里重载onDraw方法，自己绘制歌词
2.用ScrollView实现
第一种方式比较精确，但要支持滑动之后跳转播放的话难度很大，所以我选择第二种，自定义ScrollView
我也不多说，直接上代码，代码中有注释
一.自定义LycicView extends ScrollView
里面包括一个空白布局，高度是LycicView的一半，再是一个布局存放歌词的，最后是一个空白布局高度是LycicView的一半
这里动态的向第二个布局里面添加了显示歌词的TextView,并利用ViewTreeObserver得到每个textview的高度，方便知道每个textview歌词所要滑动到的高度
public class LycicView extends ScrollView {
LinearLayout rootView;//父布局
LinearLayout lycicList;//垂直布局
ArrayList<TextView> lyricItems = new ArrayList<TextView>();//每项的歌词集合
ArrayList<String> lyricTextList = new ArrayList<String>();//每行歌词文本集合，建议先去看看手机音乐里的歌词格式和内容
ArrayList<Long> lyricTimeList = new ArrayList<Long>();//每行歌词所对应的时间集合
ArrayList<Integer> lyricItemHeights;//每行歌词TextView所要显示的高度
int height;//控件高度
int width;//控件宽度
int prevSelected = 0;//前一个选择的歌词所在的item
public LycicView(Context context) {
super(context);
init();
}
public LycicView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
public LycicView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init();
}
private void init(){
rootView = new LinearLayout(getContext());
rootView.setOrientation(LinearLayout.VERTICAL);
//创建视图树，会在onLayout执行后立即得到正确的高度等参数
ViewTreeObserver vto = rootView.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
height = LycicView.this.getHeight();
width = LycicView.this.getWidth();
refreshRootView();
}
});
addView(rootView);//把布局加进去
}
/**
*
*/
void refreshRootView(){
rootView.removeAllViews();//刷新，先把之前包含的所有的view清除
//创建两个空白view
LinearLayout blank1 = new LinearLayout(getContext());
LinearLayout blank2 = new LinearLayout(getContext());
//高度平分
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(width,height/2);
rootView.addView(blank1,params);
if(lycicList !=null){
rootView.addView(lycicList);//加入一个歌词显示布局
rootView.addView(blank2,params);
}
}
/**
*设置歌词,
*/
void refreshLyicList(){
if(lycicList == null){
lycicList = new LinearLayout(getContext());
lycicList.setOrientation(LinearLayout.VERTICAL);
//刷新，重新添加
lycicList.removeAllViews();
lyricItems.clear();
lyricItemHeights = new ArrayList<Integer>();
prevSelected = 0;
//为每行歌词创建一个TextView
for(int i = 0;i<lyricTextList.size();i++){
final TextView textView = new TextView(getContext());
textView.setText(lyricTextList.get(i));
//居中显示
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params.gravity = Gravity.CENTER_HORIZONTAL;
textView.setLayoutParams(params);
//对高度进行测量
ViewTreeObserver vto = textView.getViewTreeObserver();
final int index = i;
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
textView.getViewTreeObserver().removeOnGlobalLayoutListener(this);//api 要在16以上 >=16
lyricItemHeights.add(index,textView.getHeight());//将高度添加到对应的item位置
}
});
lycicList.addView(textView);
lyricItems.add(index,textView);
}
}
}
/**
* 滚动到index位置
*/
public void scrollToIndex(int index){
if(index < 0){
scrollTo(0,0);
}
//计算index对应的textview的高度
if(index < lyricTextList.size()){
int sum = 0;
for(int i = 0;i<=index-1;i++){
sum+=lyricItemHeights.get(i);
}
//加上index这行高度的一半
sum+=lyricItemHeights.get(index)/2;
scrollTo(0,sum);
}
}
/**
* 歌词一直滑动，小于歌词总长度
* @param length
* @return
*/
int getIndex(int length){
int index = 0;
int sum = 0;
while(sum <= length){
sum+=lyricItemHeights.get(index);
index++;
}
//从1开始，所以得到的是总item，脚标就得减一
return index - 1;
}
/**
* 设置选择的index，选中的颜色
* @param index
*/
void setSelected(int index){
//如果和之前选的一样就不变
if(index == prevSelected){
return;
}
for(int i = 0;i<lyricItems.size();i++){
//设置选中和没选中的的颜色
if(i == index){
lyricItems.get(i).setTextColor(Color.BLUE);
}else{
lyricItems.get(i).setTextColor(Color.WHITE);
}
prevSelected = index;
}
}
/**
* 设置歌词，并调用之前写的refreshLyicList()方法设置view
* @param textList
* @param timeList
*/
public void setLyricText(ArrayList<String> textList,ArrayList<Long> timeList){
//因为你从歌词lrc里面可以看出，每行歌词前面都对应有时间，所以两者必须相等
if(textList.size() != timeList.size()){
throw new IllegalArgumentException();
}
this.lyricTextList = textList;
this.lyricTimeList = timeList;
refreshLyicList();
}
@Override
protected void onScrollChanged(int l, int t, int oldl, int oldt) {
super.onScrollChanged(l, t, oldl, oldt);
//滑动时，不往回弹，滑到哪就定位到哪
setSelected(getIndex(t));
if(listener != null){
listener.onLyricScrollChange(getIndex(t),getIndex(oldt));
}
}
OnLyricScrollChangeListener listener;
public void setOnLyricScrollChangeListener(OnLyricScrollChangeListener l){
this.listener = l;
}
/**
* 向外部提供接口
*/
public interface OnLyricScrollChangeListener{
void onLyricScrollChange(int index,int oldindex);
}
}
二..MainActivity中的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@mipmap/img01"
tools:context=".MainActivity">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="number"
android:ems="10"
android:id="@+id/editText"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="scroll to"
android:id="@+id/button"
android:layout_alignTop="@+id/editText"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_above="@+id/editText">
<custom.LycicView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/view"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="@null"
android:id="@+id/imageView"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<View
android:layout_below="@id/imageView"
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="6dp"
android:background="#999999"
android:id="@+id/imageView2"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
</RelativeLayout>
</RelativeLayout>
具体实现代码如下:
public class MainActivity extends AppCompatActivity {
LycicView view;
EditText editText;
Button btn;
Handler handler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
if(msg.what == 1){
if(lrc_index == list.size()){
handler.removeMessages(1);
}
lrc_index++;
System.out.println("******"+lrc_index+"*******");
view.scrollToIndex(lrc_index);
handler.sendEmptyMessageDelayed(1,4000);
}
return false;
}
});
private ArrayList<LrcMusic> lrcs;
private ArrayList<String> list;
private ArrayList<Long> list1;
private int lrc_index;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
initEvents();
}
private void initViews(){
view = (LycicView) findViewById(R.id.view);
editText = (EditText) findViewById(R.id.editText);
btn = (Button) findViewById(R.id.button);
}
private void initEvents(){
InputStream is = getResources().openRawResource(R.raw.eason_tenyears);
// BufferedReader br = new BufferedReader(new InputStreamReader(is));
list = new ArrayList<String>();
list1 = new ArrayList<>();
lrcs = Utils.redLrc(is);
for(int i = 0; i< lrcs.size(); i++){
list.add(lrcs.get(i).getLrc());
System.out.println(lrcs.get(i).getLrc()+"=====");
list1.add(0l);//lrcs.get(i).getTime()
}
view.setLyricText(list, list1);
view.postDelayed(new Runnable() {
@Override
public void run() {
view.scrollToIndex(0);
}
},1000);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String text = editText.getText().toString();
int index = 0;
index = Integer.parseInt(text);
view.scrollToIndex(index);
}
});
view.setOnLyricScrollChangeListener(new LycicView.OnLyricScrollChangeListener() {
@Override
public void onLyricScrollChange(final int index, int oldindex) {
editText.setText(""+index);
lrc_index = index;
System.out.println("===="+index+"======");
//滚动handle不能放在这，因为，这是滚动监听事件，滚动到下一次，handle又会发送一次消息，出现意想不到的效果
}
});
handler.sendEmptyMessageDelayed(1,4000);
view.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
handler.removeCallbacksAndMessages(null);
System.out.println("取消了");
break;
case MotionEvent.ACTION_UP:
System.out.println("开始了");
handler.sendEmptyMessageDelayed(1,2000);
break;
case MotionEvent.ACTION_CANCEL://时间别消耗了
break;
}
return false;
}
});
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE|WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
}
}
其中utils类和LycicMusic是一个工具类和存放Music信息实体类
Utils类
public class Utils {
public static ArrayList<LrcMusic> redLrc(InputStream in) {
ArrayList<LrcMusic> alist = new ArrayList<LrcMusic>();
//File f = new File(path.replace(".mp3", ".lrc"));
try {
//FileInputStream fs = new FileInputStream(f);
InputStreamReader input = new InputStreamReader(in, "utf-8");
BufferedReader br = new BufferedReader(input);
String s = "";
while ((s = br.readLine()) != null) {
if (!TextUtils.isEmpty(s)) {
String lyLrc = s.replace("[", "");
String[] data_ly = lyLrc.split("]");
if (data_ly.length > 1) {
String time = data_ly[0];
String lrc = data_ly[1];
LrcMusic lrcMusic = new LrcMusic(lrcData(time), lrc);
alist.add(lrcMusic);
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return alist;
}
public static int lrcData(String time) {
time = time.replace(":", "#");
time = time.replace(".", "#");
String[] mTime = time.split("#");
//[03:31.42]
int mtime = Integer.parseInt(mTime[0]);
int stime = Integer.parseInt(mTime[1]);
int mitime = Integer.parseInt(mTime[2]);
int ctime = (mtime*60+stime)*1000+mitime*10;
return ctime;
}
}
LrcMusic实体类
public class LrcMusic {
private int time;
private String lrc;
public LrcMusic() {
}
public LrcMusic(int time, String lrc) {
this.time = time;
this.lrc = lrc;
}
public int getTime() {
return time;
}
public void setTime(int time) {
this.time = time;
}
public String getLrc() {
return lrc;
}
public void setLrc(String lrc) {
this.lrc = lrc;
}
}
效果图:
