问题描述
我想实现Android的可视化类。我已经看过了其他的麻烦线程,但我仍然得到一个致命的错误。这一切看起来对我来说,它应该正常工作,无论出于何种原因,AVD不断崩溃。
首先,我使用的权限:
<使用-权限的Android:名称=android.permission.RECORD_AUDIO/>
<使用-权限的Android:名称=android.permission.MODIFY_AUDIO_SETTINGS/>
下面是我的logcat:
12-21 15:10:46.983:D / dalvikvm(642):不晚启用CheckJNI(已上)
12-21 15:10:48.823:D / MediaPlayer的(642):可能在客户端无法打开文件,试图服务器端
12-21 15:10:53.603:E / AudioEffect(642):设定():AudioFlinger无法创建效果,状态:-22
12-21 15:10:53.603:E /展示台,JNI(642):展示台initCheck失败-4
12-21 15:10:53.613:E /展示台-JAVA(642):错误code -4初始化展示台时。
12-21 15:10:53.613:E /视觉EX(642):无法初始化可视化引擎,错误:-4
12-21 15:10:53.964:D / gralloc_goldfish(642):没有GPU的仿真模拟器检测。
和我的code:
包MediaPlayer.namespace;
进口java.io.IOException异常;
进口android.app.Activity;
进口android.media.MediaPlayer;
进口android.media.MediaRecorder;
进口android.media.audiofx.Visualizer;
进口android.net.Uri;
进口android.os.Bundle;
进口android.util.Log;
公共类MediaPlayerActivity扩展活动
{
展台的视觉;
INT formattedVizData [];
字节rawWaveForm [];
INT CONT = 0xFF的;
公共无效的onCreate(包savedInstanceState)
{
//开始
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
///启动媒体播放器和放大器;可视化工具。
的MediaPlayer媒体播放器=新的MediaPlayer();
媒体播放器= MediaPlayer.create(这一点,Uri.parse(http://vprbbc.streamguys.net:80/vprbbc24.mp3));
mediaPlayer.start();
//创建可视化对象,并将其连接到我们的媒体播放器。
尝试{
视觉=新的可视化工具(mediaPlayer.getAudioSessionId()); //此行引起异常
visual.setEnabled(真正的);
visual.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
}
赶上(例外前)
{
Log.e(视觉防爆,ex.getMessage());
}
}
}
我有同样的问题,所以要尽量添加 在AndroidManifest.xml文件权限
如果您wan`t看到奥迪波此外,您HOULD显示它在画布或东西...
工作的例子:
// android.permission.MODIFY_AUDIO_SETTINGS的音频设置,也
//android.permission.INTERNET互联网流媒体
包com.janilemy;
进口android.app.Activity;
进口android.content.Context;
进口android.graphics.Canvas;
进口android.graphics.Color;
进口android.graphics.Paint;
进口android.graphics.Rect;
进口android.media.AudioManager;
进口android.media.MediaPlayer;
进口android.media.audiofx.Visualizer;
进口android.os.Bundle;
进口android.view.Gravity;
进口android.view.View;
进口android.view.ViewGroup;
进口android.widget.LinearLayout;
进口android.widget.SeekBar;
进口android.widget.TextView;
进口java.io.IOException异常;
公共类AudioFxDemoActivity延伸活动{
//这里是你的网址定义
字符串URL =http://vprbbc.streamguys.net/vprbbc24.mp3;
//常量vizualizator - 高度50dip
私有静态最终浮动VISUALIZER_HEIGHT_DIP = 50F;
//你的MediaPlayer
MediaPlayer的熔点;
// Vizualization
私人展示台mVisualizer;
私人的LinearLayout mLinearLayout;
私人VisualizerView mVisualizerView;
私人TextView的mStatusTextView;
/ **第一次创建活动时调用。 * /
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的setContentView(R.layout.main);
//信息的TextView
mStatusTextView =新的TextView(本);
//创建新的LinearLayout(因为main.xml中为空)
mLinearLayout =新的LinearLayout(本);
mLinearLayout.setOrientation(LinearLayout.VERTICAL);
mLinearLayout.addView(mStatusTextView);
//设置的内容,以便我们创造新的布局
的setContentView(mLinearLayout);
//启动媒体播放器 - 像正常
熔点为新的MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
尝试 {
mp.setDataSource(URL);我们的网址定义//设置数据源
}赶上(抛出:IllegalArgumentException E){
// TODO自动生成的catch块
e.printStackTrace();
}赶上(IllegalStateException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}赶上(IOException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}
尝试{//告诉玩家去prepare状态
MP prepare()。
}赶上(IllegalStateException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}赶上(IOException异常E){
// TODO自动生成的catch块
e.printStackTrace();
}
//启动流/播放器
mp.start();
//设置你的Vizualizer - 调用方法
setupVisualizerFxAndUI();
//使vizualizer
mVisualizer.setEnabled(真正的);
//信息文本
mStatusTextView.setText(播放声音......);
}
//我们的方法,设置Vizualizer
私人无效setupVisualizerFxAndUI(){
//创建一个VisualizerView(定义如下),这将呈现简化的音频
//波形到画布。
//你需要有一些东西在哪里显示音频波形 - 在这种情况下,画布
mVisualizerView =新VisualizerView(本);
mVisualizerView.setLayoutParams(新ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
(中间体)(VISUALIZER_HEIGHT_DIP * getResources()getDisplayMetrics()密度。)));
mLinearLayout.addView(mVisualizerView);
//创建可视化对象,并将其连接到我们的媒体播放器。
//你需要android.permission.RECORD_AUDIO为在AndroidManifest.xml中
mVisualizer =新的可视化工具(mp.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(新Visualizer.OnDataCaptureListener(){
公共无效onWaveFormDataCapture(可视化可视化工具,byte []的字节数,
INT采样速率){
mVisualizerView.updateVisualizer(字节);
}
公共无效onFftDataCapture(可视化可视化工具,byte []的字节,INT采样速率){}
},Visualizer.getMaxCaptureRate()/ 2,真,假);
}
@覆盖
保护无效的onPause(){
super.onPause();
如果(isFinishing()&安培;&安培;熔点=空!){
mVisualizer.release();
mEqualizer.release();
mp.release();
熔点=无效;
}
}
/ **
*绘制一条从接收到的波形数据的简单类
* {@link Visualizer.OnDataCaptureListener#onWaveFormDataCapture}
* /
类VisualizerView扩展视图{
私人字节[]字节;
私人浮法[] M点;
私人矩形mRect =新的矩形();
民营涂料mForePaint =新的油漆();
公共VisualizerView(上下文的背景下){
超(上下文);
在里面();
}
私人无效的init(){
兆字节= NULL;
mForePaint.setStrokeWidth(1F);
mForePaint.setAntiAlias(真正的);
mForePaint.setColor(Color.rgb(0,128,255));
}
公共无效updateVisualizer(byte []的字节){
兆字节=字节;
无效();
}
@覆盖
保护无效的OnDraw(帆布油画){
super.onDraw(画布);
如果(兆字节== NULL){
返回;
}
如果(M点== NULL || mPoints.length< mBytes.length * 4){
M点=新的浮动[mBytes.length * 4]。
}
mRect.set(0,0,的getWidth(),的getHeight());
的for(int i = 0; I< mBytes.length - 1;我++){
M点[I * 4 = mRect.width()* I /(mBytes.length - 1);
M点[I * 4 + 1] = mRect.height()/ 2
+((字节)(兆字节[I] + 128))*(mRect.height()/ 2)/ 128;
M点[I * 4 + 2] = mRect.width()*第(i + 1)/(mBytes.length - 1);
M点[I * 4 + 3] = mRect.height()/ 2
+((字节)(兆字节[1 + 1] + 128))*(mRect.height()/ 2)/ 128;
}
canvas.drawLines(M点,mForePaint);
}
}
}
这是Android的媒体播放器的音频波形可视化的一个完整的工作的例子。我希望这将有助于你和你的解决方案...
贾尼→
I am trying to implement the Android Visualizer class. I have looked up other trouble threads but I am still getting a fatal error. This all looks to me like it should work correctly, for whatever reason the AVD keeps on crashing.
First off, I am using the permissions:
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
Here is my logcat:
12-21 15:10:46.983: D/dalvikvm(642): Not late-enabling CheckJNI (already on)
12-21 15:10:48.823: D/MediaPlayer(642): Couldn't open file on client side, trying server side
12-21 15:10:53.603: E/AudioEffect(642): set(): AudioFlinger could not create effect, status: -22
12-21 15:10:53.603: E/visualizers-JNI(642): Visualizer initCheck failed -4
12-21 15:10:53.613: E/Visualizer-JAVA(642): Error code -4 when initializing Visualizer.
12-21 15:10:53.613: E/Visual Ex(642): Cannot initialize Visualizer engine, error: -4
12-21 15:10:53.964: D/gralloc_goldfish(642): Emulator without GPU emulation detected.
And my code:
package MediaPlayer.namespace;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.media.audiofx.Visualizer;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
public class MediaPlayerActivity extends Activity
{
Visualizer visual;
int formattedVizData[];
byte rawWaveForm[];
int cont = 0xFF;
public void onCreate(Bundle savedInstanceState)
{
//start
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
///start media player & visualizer.
MediaPlayer mediaPlayer = new MediaPlayer();
mediaPlayer = MediaPlayer.create(this, Uri.parse("http://vprbbc.streamguys.net:80/vprbbc24.mp3"));
mediaPlayer.start();
// Create the Visualizer object and attach it to our media player.
try{
visual = new Visualizer(mediaPlayer.getAudioSessionId()); // this line causing Exception
visual.setEnabled(true);
visual.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
}
catch(Exception ex)
{
Log.e("Visual Ex", ex.getMessage());
}
}
}
I have same problem, so try to add permission in AndroidManifest.xml file
Also if you wan`t to see that audi wave, you hould show it in canvas or something ...
Working example :
//android.permission.MODIFY_AUDIO_SETTINGS for audio settings and also
//android.permission.INTERNET for internet streaming
package com.janilemy;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.audiofx.Visualizer;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;
import java.io.IOException;
public class AudioFxDemoActivity extends Activity {
//Here is your URL defined
String url = "http://vprbbc.streamguys.net/vprbbc24.mp3";
//Constants for vizualizator - HEIGHT 50dip
private static final float VISUALIZER_HEIGHT_DIP = 50f;
//Your MediaPlayer
MediaPlayer mp;
//Vizualization
private Visualizer mVisualizer;
private LinearLayout mLinearLayout;
private VisualizerView mVisualizerView;
private TextView mStatusTextView;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Info textView
mStatusTextView = new TextView(this);
//Create new LinearLayout ( because main.xml is empty )
mLinearLayout = new LinearLayout(this);
mLinearLayout.setOrientation(LinearLayout.VERTICAL);
mLinearLayout.addView(mStatusTextView);
//set content view to new Layout that we create
setContentView(mLinearLayout);
//start media player - like normal
mp = new MediaPlayer();
mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
mp.setDataSource(url); // set data source our URL defined
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try { //tell your player to go to prepare state
mp.prepare();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//Start your stream / player
mp.start();
//setup your Vizualizer - call method
setupVisualizerFxAndUI();
//enable vizualizer
mVisualizer.setEnabled(true);
//Info text
mStatusTextView.setText("Playing audio...");
}
//Our method that sets Vizualizer
private void setupVisualizerFxAndUI() {
// Create a VisualizerView (defined below), which will render the simplified audio
// wave form to a Canvas.
//You need to have something where to show Audio WAVE - in this case Canvas
mVisualizerView = new VisualizerView(this);
mVisualizerView.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
(int)(VISUALIZER_HEIGHT_DIP * getResources().getDisplayMetrics().density)));
mLinearLayout.addView(mVisualizerView);
// Create the Visualizer object and attach it to our media player.
//YOU NEED android.permission.RECORD_AUDIO for that in AndroidManifest.xml
mVisualizer = new Visualizer(mp.getAudioSessionId());
mVisualizer.setCaptureSize(Visualizer.getCaptureSizeRange()[1]);
mVisualizer.setDataCaptureListener(new Visualizer.OnDataCaptureListener() {
public void onWaveFormDataCapture(Visualizer visualizer, byte[] bytes,
int samplingRate) {
mVisualizerView.updateVisualizer(bytes);
}
public void onFftDataCapture(Visualizer visualizer, byte[] bytes, int samplingRate) {}
}, Visualizer.getMaxCaptureRate() / 2, true, false);
}
@Override
protected void onPause() {
super.onPause();
if (isFinishing() && mp != null) {
mVisualizer.release();
mEqualizer.release();
mp.release();
mp = null;
}
}
/**
* A simple class that draws waveform data received from a
* {@link Visualizer.OnDataCaptureListener#onWaveFormDataCapture }
*/
class VisualizerView extends View {
private byte[] mBytes;
private float[] mPoints;
private Rect mRect = new Rect();
private Paint mForePaint = new Paint();
public VisualizerView(Context context) {
super(context);
init();
}
private void init() {
mBytes = null;
mForePaint.setStrokeWidth(1f);
mForePaint.setAntiAlias(true);
mForePaint.setColor(Color.rgb(0, 128, 255));
}
public void updateVisualizer(byte[] bytes) {
mBytes = bytes;
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mBytes == null) {
return;
}
if (mPoints == null || mPoints.length < mBytes.length * 4) {
mPoints = new float[mBytes.length * 4];
}
mRect.set(0, 0, getWidth(), getHeight());
for (int i = 0; i < mBytes.length - 1; i++) {
mPoints[i * 4] = mRect.width() * i / (mBytes.length - 1);
mPoints[i * 4 + 1] = mRect.height() / 2
+ ((byte) (mBytes[i] + 128)) * (mRect.height() / 2) / 128;
mPoints[i * 4 + 2] = mRect.width() * (i + 1) / (mBytes.length - 1);
mPoints[i * 4 + 3] = mRect.height() / 2
+ ((byte) (mBytes[i + 1] + 128)) * (mRect.height() / 2) / 128;
}
canvas.drawLines(mPoints, mForePaint);
}
}
}
This is a full working example of android media player audio wave visualization... I hope it will help you with your solution ...
Jani L
这篇关于Android的可视化实现崩溃的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!