Android课程---简单的音乐播放器
第一个:用Activity实现
activity_music_play1.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.hanqi.test2.MusicPlay1" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="播放状态:" android:id="@+id/tv_1"/> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="播放" android:onClick="play_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="暂停" android:onClick="pause_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="停止" android:onClick="stop_onclick"/> <Button android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:text="退出" android:onClick="exit_onclick"/> </LinearLayout> </LinearLayout>
MusicPlay1.java
package com.hanqi.test2; import android.media.MediaPlayer; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.TextView; public class MusicPlay1 extends AppCompatActivity { TextView tv_1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_music_play1); tv_1 =(TextView)findViewById(R.id.tv_1); tv_1.setText("播放状态:停止播放"); } //媒体播放器的类 private MediaPlayer mediaPlayer; public void play_onclick(View v) { if (mediaPlayer == null) { //调用MediaPlayer的静态方法create() mediaPlayer = MediaPlayer.create(this, R.raw.love); } mediaPlayer.start(); tv_1.setText("播放状态:正在播放..."); } public void stop_onclick(View v) { if (mediaPlayer != null) { mediaPlayer.stop(); //停止 mediaPlayer.reset(); //重置 mediaPlayer.release(); //释放资源 mediaPlayer = null; //赋空 } tv_1.setText("播放状态:停止播放"); } public void pause_onclick(View v) { //isPlaying:状态 if (mediaPlayer != null && mediaPlayer.isPlaying()) { mediaPlayer.pause(); tv_1.setText("播放状态:暂停播放"); } } public void exit_onclick(View v) { stop_onclick(v); finish(); } }
效果图:
第二个:用Service实现
可以实现后台播放 不影响其他程序运行 重新进入也不会重新播放歌曲
MusicPlay2.java
package com.hanqi.test2; import android.content.Intent; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.TextView; public class MusicPlay2 extends AppCompatActivity { TextView tv_1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_music_play1); tv_1 =(TextView)findViewById(R.id.tv_1); tv_1.setText("播放状态:停止播放"); } public void play_onclick(View v) { Intent intent = new Intent(this,MusicPlayService.class); intent.putExtra("action","play"); startService(intent); tv_1.setText("播放状态1:正在播放..."); } public void stop_onclick(View v) { Intent intent = new Intent(this,MusicPlayService.class); intent.putExtra("action","stop"); startService(intent); tv_1.setText("播放状态1:停止播放"); } public void pause_onclick(View v) { Intent intent = new Intent(this,MusicPlayService.class); intent.putExtra("action","pause"); startService(intent); tv_1.setText("播放状态1:暂停播放"); } public void exit_onclick(View v) { stop_onclick(v); finish(); } }
MusicPlayService.java
package com.hanqi.test2; import android.app.Service; import android.content.Intent; import android.media.MediaPlayer; import android.os.IBinder; public class MusicPlayService extends Service { public MusicPlayService() { } @Override public IBinder onBind(Intent intent) { // TODO: Return the communication channel to the service. throw new UnsupportedOperationException("Not yet implemented"); } private MediaPlayer mediaPlayer; @Override public int onStartCommand(Intent intent, int flags, int startId) { //获取意图传递的信息 String action = intent.getStringExtra("action"); switch (action) { case "play": if (mediaPlayer == null) { mediaPlayer = MediaPlayer.create(this,R.raw.love); } mediaPlayer.start(); break; case "stop": if (mediaPlayer != null) { mediaPlayer.stop(); mediaPlayer.reset(); mediaPlayer.release(); mediaPlayer = null; } break; case "pause": mediaPlayer.pause(); break; } return super.onStartCommand(intent, flags, startId); } }
效果图: