音乐播放器
1.提前准备
创建raw文件夹,加音乐文件
布局如下:
代码:
<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: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.black.sq.lesson14.Main3Activity">
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/imageView"
android:src="@mipmap/ic_launcher"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="81dp" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="start"
android:id="@+id/start"
android:layout_marginTop="125dp"
android:layout_below="@+id/imageView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:onClick="click"
/>
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="end"
android:onClick="click"
android:id="@+id/end"
android:layout_alignTop="@+id/start"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="暂停"
android:onClick="click"
android:id="@+id/pause"
android:layout_alignTop="@+id/end"
android:layout_centerHorizontal="true" />
<SeekBar
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/seekBar"
android:layout_above="@+id/end"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginBottom="43dp"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
2.MainActivity 代码
public class Main3Activity extends AppCompatActivity {
private Button start,end,pause;
MediaPlayer mediaPlayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
start= (Button) findViewById(R.id.start);
end= (Button) findViewById(R.id.end);
pause= (Button) findViewById(R.id.pause);
//第二个参数,是要播放的歌曲
mediaPlayer=MediaPlayer.create(Main3Activity.this,R.raw.a);
}
public void click(View view){
int id=view.getId();
switch (id){
case R.id.start:
start();
break;
case R.id.end:
stop();
break;
case R.id.pause:
pause();
break;
}
}
public void start(){
mediaPlayer.start();
//设成不可用
start.setEnabled(false);
}
public void stop(){
if(mediaPlayer!=null){
mediaPlayer.stop();
//释放mediaPlayer
mediaPlayer.release();
mediaPlayer=null;
start.setEnabled(true);
}
}
public void pause(){
String pause1=pause.getText().toString().trim();
if("暂停".equals(pause1)){
mediaPlayer.pause();
pause.setText("继续");
}else{
mediaPlayer.start();
pause.setText("暂停");
}
}
}