Question

我正在尝试使用搜索栏监听器播放一首歌。但是当我尝试拖动进度条时，它正在从歌曲的开头播放。它需要从拖拽的位置发挥作用。

这是我的代码：

import java.util.Scanner;
public class cCode {

public static void main(String args[]) {

    System.out.println("Enter country code\nChoices: IND, USA, JPN, NZ, WI");
    Scanner cc = new Scanner(System.in);
    String txt = cc.nextLine();
    switch (txt) {
        case "IND":
            System.out.println(txt + " refers to INDIA");
            break;

        case "USA":
            System.out.println(txt + " refers to UNITED STATES");
            break;

        case "JPN":
            System.out.println(txt + " refers to JAPAN");
            break;

        case "NZ":
            System.out.println(txt + " refers to NEW ZEALAND");
            break;

        case "WI":
            System.out.println(txt + " refers to WEST INDIES");
            break;

        default:
            System.out.println("Invalid choice");
   }
}}

如何解决此问题。提前谢谢..

Answer 1

我在这里做了一些技巧：

将MediaPlayer实例移至init（）方法
更改了此行

int mCurrentPosition = mMediaPlayer.getCurrentPosition（）/ 1000;

为：

int mCurrentPosition = mp.getCurrentPosition（）;

更改了此行

mp.seekTo（进度* 1000）;

为：

mp.seekTo（进度）;

最后工作代码将是：

public class MainActivity extends Activity {

    private TextView prairText;
    private AssetFileDescriptor descriptor;
    private SeekBar seekBar;
    private MediaPlayer mp;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Keep screen active
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        findViewById(R.id.play_button).setVisibility(View.INVISIBLE);
        findViewById(R.id.pauseButton).setVisibility(View.VISIBLE);

        init();

        // Play song
        if (mp != null) {
            mp.start();
        }

        final Handler mHandler = new Handler();
        //Make sure you update Seek bar on UI thread
        MainActivity.this.runOnUiThread(new Runnable() {

            @Override
            public void run() {
                if(mp != null){
                    int mCurrentPosition = mp.getCurrentPosition();
                    seekBar.setProgress(mCurrentPosition);
                }
                mHandler.postDelayed(this, 1000);
            }
        });

        seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                if (mp != null && fromUser) {
                    mp.seekTo(progress);
                    mp.start();
                    findViewById(R.id.play_button).setVisibility(View.INVISIBLE);
                    findViewById(R.id.pauseButton).setVisibility(View.VISIBLE);
                }

            }
        });
        findViewById(R.id.play_button).setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                if (mp != null) {
                    mp.start();
                    findViewById(R.id.play_button).setVisibility(View.INVISIBLE);
                    findViewById(R.id.pauseButton).setVisibility(View.VISIBLE);
                }
            }
        });

        findViewById(R.id.pauseButton).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (mp != null) {
                    mp.pause();
                    findViewById(R.id.pauseButton).setVisibility(View.INVISIBLE);
                    findViewById(R.id.play_button).setVisibility(View.VISIBLE);
                }
                mp.pause();
            }
        });
        findViewById(R.id.restart_button).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (mp != null) {
                    mp.seekTo(0);
                    mp.start();
                    findViewById(R.id.play_button).setVisibility(View.INVISIBLE);
                    findViewById(R.id.pauseButton).setVisibility(View.VISIBLE);
                }
            }
        });

private void init() {
        mp = new MediaPlayer();
        mp.reset();
        prairText = (TextView) findViewById(R.id.prairText);
        seekBar = (SeekBar) findViewById(R.id.seekBar1);
        try {
            descriptor = getAssets().openFd("mysong.mp3");
            mp.setDataSource(descriptor.getFileDescriptor(), descriptor.getStartOffset(), descriptor.getLength());
            descriptor.close();
            mp.prepare();
        } catch (Exception e) {
            e.printStackTrace();
        }
        int duration = mp.getDuration();
        seekBar.setMax(duration);
    }
}

注意：不要忘记将mysong.mp3放入assets文件夹

Android媒体播放器搜索栏从停止位置播放

1 个答案: