android_内存卡播放器

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MainActivity.javapackage com.example.mediaplayer;import android.media.MediaPlayer;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.ImageButton;import android.widget.SeekBar;public class MainActivity extends AppCompatActivity {    private MediaPlayer mediaPlayer;    private SeekBar sb_main_bar;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        sb_main_bar = (SeekBar) findViewById(R.id.sb_main_bar);        //给进度条设置监听        sb_main_bar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                //获取当前进度条的位置                int c=seekBar.getProgress();                //跳转当某个位置进行播放                mediaPlayer.seekTo(c);            }        });    }    public void playOrPause(View view){        ImageButton imageButton= (ImageButton) view;        if(mediaPlayer==null){            mediaPlayer = MediaPlayer.create(this, R.raw.s8);            mediaPlayer.start();            //暂停图标            imageButton.setImageResource(android.R.drawable.ic_media_pause);            int time= mediaPlayer.getDuration();            //设置最大值            sb_main_bar.setMax(time);            new My().start();        }else if(mediaPlayer.isPlaying()){            mediaPlayer.pause();            imageButton.setImageResource(android.R.drawable.ic_media_play);        }else{            mediaPlayer.start();            imageButton.setImageResource(android.R.drawable.ic_media_pause);        }    }    class My extends Thread{        @Override        public void run() {            super.run();            while(sb_main_bar.getProgress()<sb_main_bar.getMax()){                //获取音乐当前播放位置                int currentPosition=mediaPlayer.getCurrentPosition();                sb_main_bar.setProgress(currentPosition);            }        }    }}AndoirdManifest.xml<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.mediaplayer">    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"></uses-permission>    <application android:allowBackup="true" android:icon="@mipmap/ic_launcher"        android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true" android:theme="@style/AppTheme">        <activity android:name=".MainActivity">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>activity_main.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:orientation="vertical"    android:layout_height="match_parent" tools:context="com.example.mediaplayer.MainActivity">        <SeekBar            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:id="@+id/sb_main_bar"            />        <ImageButton            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@android:drawable/ic_media_play"            android:onClick="playOrPause"            /></LinearLayout>
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