要解决Android中的SeekBar和MediaPlayer问题,可以按照以下步骤进行:
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private MediaPlayer mediaPlayer;
private Button playButton, pauseButton, stopButton;
private SeekBar seekBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mediaPlayer = MediaPlayer.create(this, R.raw.song); // 替换为你的音频文件
playButton = findViewById(R.id.playButton);
pauseButton = findViewById(R.id.pauseButton);
stopButton = findViewById(R.id.stopButton);
seekBar = findViewById(R.id.seekBar);
playButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.start();
}
});
pauseButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.pause();
}
});
stopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mediaPlayer.stop();
mediaPlayer.prepareAsync();
mediaPlayer.seekTo(0);
}
});
seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if (fromUser) {
mediaPlayer.seekTo(progress);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
seekBar.setMax(mediaPlayer.getDuration());
mediaPlayer.start();
}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer.seekTo(0);
mediaPlayer.pause();
}
});
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mediaPlayer != null) {
mediaPlayer.release();
mediaPlayer = null;
}
}
}
此示例代码将创建一个包含播放、暂停和停止按钮的界面,并使用SeekBar来显示音频的当前进度。当用户点击播放按钮时,MediaPlayer将开始播放音频文件,并将SeekBar设置为音频的总时长。当用户拖动SeekBar时,MediaPlayer将跳转到指定的位置。当音频播放完成时,MediaPlayer将重置到初始位置。记得将R.raw.song
替换为你的音频文件。