Android实现简易版弹钢琴效果

本文实例为大家分享了android实现弹钢琴效果展示的具体代码，供大家参考，具体内容如下

目标效果：

1.drawable下新建button_selector.xml页面：

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
 
 <item android:drawable="@drawable/button_pressed" android:state_pressed="true"></item>
 <item android:drawable="@drawable/button"></item>
 
</selector>

2.drawable下新建button.xml页面：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
 
 <corners
 android:bottomleftradius="10dp"
 android:bottomrightradius="10dp" >
 </corners>
 
 <stroke
 android:width="2dp"
 android:color="#605c59" />
 
 <gradient
 android:angle="270"
 android:endcolor="#ffffff"
 android:startcolor="#f5f5f5" />
 
</shape>

3.drawable下新建button_pressed.xml页面：

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
 
 <solid android:color="#a4a4a4" />
 
 <corners
 android:bottomleftradius="10dp"
 android:bottomrightradius="10dp" >
 </corners>
 
 <stroke
 android:width="2dp"
 android:color="#605c59" />
 
</shape>

4.新建paniomusic.java类

package com.example.weixu.view;
 
/**
 * 音乐播放帮助类
 */
 
import java.util.hashmap;
import android.content.context;
import android.media.audiomanager;
import android.media.soundpool;
 
import com.example.weixu.playpanio.r;
 
public class paniomusic {
 // 资源文件
 int music[] = {r.raw.do1, r.raw.re2, r.raw.mi3, r.raw.fa4, r.raw.sol5,
 r.raw.la6, r.raw.si7,};
 soundpool soundpool;
 hashmap<integer, integer> soundpoolmap;
 
 public paniomusic(context context) {
 soundpool = new soundpool(2, audiomanager.stream_music, 100);
 soundpoolmap = new hashmap<integer, integer>();
 for (int i = 0; i < music.length; i++) {
 soundpoolmap.put(i, soundpool.load(context, music[i], 1));
 }
 }
 
 public int soundplay(int no) {
 return soundpool.play(soundpoolmap.get(no), 100, 100, 1, 0, 1.0f);
 }
 
 public int soundover() {
 return soundpool.play(soundpoolmap.get(1), 100, 100, 1, 0, 1.0f);
 }
 
 @override
 protected void finalize() throws throwable {
 soundpool.release();
 super.finalize();
 }
}

5.activity_main.xml页面：

<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/llparent"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical"
 tools:context=".mainactivity" >
 
 <linearlayout
 android:id="@+id/llkeys"
 android:layout_width="match_parent"
 android:layout_height="0dp"
 android:layout_weight="5"
 android:orientation="horizontal"
 android:padding="10dp" >
 
 <button
 android:id="@+id/btpanioone"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="1" />
 
 <button
 android:id="@+id/btpaniotwo"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="2" />
 
 <button
 android:id="@+id/btpaniothree"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="3" />
 
 <button
 android:id="@+id/btpaniofour"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="4" />
 
 <button
 android:id="@+id/btpaniofive"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="5" />
 
 <button
 android:id="@+id/btpaniosix"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="6" />
 
 <button
 android:id="@+id/btpanioseven"
 android:layout_width="0dp"
 android:layout_height="match_parent"
 android:layout_weight="1"
 android:background="@drawable/button"
 android:text="7" />
 </linearlayout>
 
</linearlayout>

6.mainactivity.java页面：

package com.example.weixu.playpanio;
 
import android.os.bundle;
import android.app.activity;
import android.util.log;
import android.view.motionevent;
import android.view.view;
import android.view.view.ontouchlistener;
import android.widget.button;
 
import com.example.weixu.view.paniomusic;
 
public class mainactivity extends activity {
 private button button[];// 按钮数组
 private paniomusic utils;// 工具类
 private view parent;// 父视图
 private int buttonid[];// 按钮id
 private boolean haveplayed[];// 是否已经播放了声音，当手指在同一个按钮内滑动，且已经发声，就为true
 private view keys;// 按钮们所在的视图
 private int pressedkey[];
 
 @override
 protected void oncreate(bundle savedinstancestate) {
 super.oncreate(savedinstancestate);
 setcontentview(r.layout.activity_main);
 
 init();
 parent = (view) findviewbyid(r.id.llparent);
 parent.setclickable(true);
 
 parent.setontouchlistener(new ontouchlistener() {
 
 @override
 public boolean ontouch(view v, motionevent event) {
 int temp;
 int tempindex;
 int pointercount;
 pointercount = event.getpointercount();
 for (int count = 0; count < pointercount; count++) {
  boolean moveflag = false;// 标记是否是在按键上移动
  temp = isinanyscale(event.getx(count), event.gety(count),
  button);
  if (temp != -1) {// 事件对应的是当前点
  switch (event.getactionmasked()) {
  case motionevent.action_down:
  // // 单独一根手指或最先按下的那个
  // pressedkey = temp;
  case motionevent.action_pointer_down:
  log.i("--", "count" + count);
  pressedkey[count] = temp;
  if (!haveplayed[temp]) {// 在某个按键范围内
   button[temp]
   .setbackgroundresource(r.drawable.button_pressed);
   // 播放音阶
   utils.soundplay(temp);
   log.i("--", "sound" + temp);
   haveplayed[temp] = true;
  }
  break;
  case motionevent.action_move:
  temp = pressedkey[count];
  for (int i = temp + 1; i >= temp - 1; i--) {
   // 当在两端的按钮时，会有一边越界
   if (i < 0 || i >= button.length) {
   continue;
   }
   if (isinscale(event.getx(count),
   event.gety(count), button[i])) {// 在某个按键内
   moveflag = true;
   if (i != temp) {// 在相邻按键内
   boolean laststill = false;
   boolean nextstill = false;
   // 假设手指已经从上一个位置抬起，但是没有真的抬起，所以不移位
   pressedkey[count] = -1;
   for (int j = 0; j < pointercount; j++) {
   if (pressedkey[j] == temp) {
    laststill = true;
   }
   if (pressedkey[j] == i) {
    nextstill = true;
   }
   }
 
   if (!nextstill) {// 移入的按键没有按下
   // 设置当前按键
   button[i]
    .setbackgroundresource(r.drawable.button_pressed);
   // 发音
   utils.soundplay(i);
   haveplayed[i] = true;
   }
 
   pressedkey[count] = i;
 
   if (!laststill) {// 没有手指按在上面
   // 设置上一个按键
   button[temp]
    .setbackgroundresource(r.drawable.button);
   haveplayed[temp] = false;
   }
 
   break;
   }
   }
  }
  break;
  case motionevent.action_up:
  case motionevent.action_pointer_up:
  // 事件与点对应
  tempindex = event.getactionindex();
  if (tempindex == count) {
   log.i("--", "index" + tempindex);
   boolean still = false;
   // 当前点已抬起
   for (int t = count; t < 5; t++) {
   if (t != 4) {
   if (pressedkey[t + 1] >= 0) {
   pressedkey[t] = pressedkey[t + 1];
   } else {
   pressedkey[t] = -1;
   }
   } else {
   pressedkey[t] = -1;
   }
 
   }
   for (int i = 0; i < pressedkey.length; i++) {// 是否还有其他点
   if (pressedkey[i] == temp) {
   still = true;
   break;
   }
   }
   if (!still) {// 已经没有手指按在该键上
   button[temp]
   .setbackgroundresource(r.drawable.button);
   haveplayed[temp] = false;
   log.i("--", "button" + temp + "up");
   }
   break;
  }
  }
  }
  //
  if (event.getactionmasked() == motionevent.action_move
  && !moveflag) {
  if (pressedkey[count] != -1) {
  button[pressedkey[count]]
   .setbackgroundresource(r.drawable.button);
  haveplayed[pressedkey[count]] = false;
  }
  }
 }
 return false;
 }
 });
 
 keys = (view) findviewbyid(r.id.llkeys);
 }
 
 private void init() {
 // 新建工具类
 utils = new paniomusic(getapplicationcontext());
 
 // 按钮资源id
 buttonid = new int[7];
 buttonid[0] = r.id.btpanioone;
 buttonid[1] = r.id.btpaniotwo;
 buttonid[2] = r.id.btpaniothree;
 buttonid[3] = r.id.btpaniofour;
 buttonid[4] = r.id.btpaniofive;
 buttonid[5] = r.id.btpaniosix;
 buttonid[6] = r.id.btpanioseven;
 
 button = new button[7];
 haveplayed = new boolean[7];
 
 // 获取按钮对象
 for (int i = 0; i < button.length; i++) {
 button[i] = (button) findviewbyid(buttonid[i]);
 button[i].setclickable(false);
 haveplayed[i] = false;
 }
 
 pressedkey = new int[5];
 for (int j = 0; j < pressedkey.length; j++) {
 pressedkey[j] = -1;
 }
 
 }
 
 /**
 * 判断某个点是否在某个按钮的范围内
 *
 * @param x 横坐标
 * @param y 纵坐标
 * @param button 按钮对象
 * @return 在：true；不在：false
 */
 private boolean isinscale(float x, float y, button button) {
 // keys.gettop()是获取按钮所在父视图相对其父视图的右上角纵坐标
 
 if (x > button.getleft() && x < button.getright()
 && y > button.gettop() + keys.gettop()
 && y < button.getbottom() + keys.gettop()) {
 return true;
 } else {
 return false;
 }
 }
 
 /**
 * 判断某个点是否在一个按钮集合中的某个按钮内
 *
 * @param x 横坐标
 * @param y 纵坐标
 * @param button 按钮数组
 * @return
 */
 private int isinanyscale(float x, float y, button[] button) {
 // keys.gettop()是获取按钮所在父视图相对其父视图的右上角纵坐标
 
 for (int i = 0; i < button.length; i++) {
 if (x > button[i].getleft() && x < button[i].getright()
  && y > button[i].gettop() + keys.gettop()
  && y < button[i].getbottom() + keys.gettop()) {
 return i;
 }
 }
 return -1;
 }
}

7.androidmanifest.xml页面对某个activity页面进行设置横屏

android:screenorientation="landscape"

8.另外，每个按键的音效需要提前导入res下raw文件夹中。

源码：点击打开链接

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。