MediaPlayer和SeekBar配合起来

最新推荐文章于 2023-05-13 14:52:49 发布

lazying_bird

最新推荐文章于 2023-05-13 14:52:49 发布

阅读量4.1k

点赞数 1

分类专栏： Android 文章标签： MediaPlaye SeekBar Handler

本文链接：https://blog.youkuaiyun.com/a_flying_bird/article/details/50983210

版权

Android 专栏收录该内容

57 篇文章

订阅专栏

本文介绍了一个集成MediaPlayer和SeekBar的示例应用，展示了如何通过按钮控制音频播放与暂停，并利用SeekBar实现进度条同步更新及手动拖动调整播放位置的功能。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

MediaPlayer和SeekBar配合在一起的例子。

预备

例子

my_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <!-- Use LinearLayout to seperate the two buttons. So clear the warning:
             Buttons in button bars should be borderless;  -->

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="vertical" >
            <Button
                android:id="@+id/start"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/start" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:orientation="vertical" >
            <Button
                android:id="@+id/stop"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/stop" />
        </LinearLayout>

    </LinearLayout>

    <SeekBar
        android:id="@+id/mediaSeekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

代码

package com.example.mediaplayerexample;

import java.io.IOException;

import android.app.Activity;
import android.content.res.AssetFileDescriptor;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;


public class MainActivity extends Activity {
    private final String TAG = "MainActivity";

    private MediaPlayer mediaPlayer = null;
    private Button start = null;
    private Button stop = null;
    private SeekBar mediaSeekBar = null;

    boolean isPlaying = false;
    private final int MONITOR_MSG_ID = 0;
    private Thread monitor = null;
    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (!isPlaying || msg.what != MONITOR_MSG_ID) {
                super.handleMessage(msg);
                return;
            }

            mediaSeekBar.setProgress(mediaPlayer.getCurrentPosition());
        }
    };

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

        start = (Button) findViewById(R.id.start);
        stop = (Button) findViewById(R.id.stop);
        stop.setEnabled(false);
        start.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    mediaPlayer.prepare();
                } catch (IllegalStateException e) {
                    Log.d(TAG, "start click error", e);
                } catch (IOException e) {
                    Log.d(TAG, "start click error", e);
                }

                isPlaying = true;
                mediaPlayer.start();
                mediaSeekBar.setMax(mediaPlayer.getDuration());
                start.setEnabled(false);
                stop.setEnabled(true);
                monitor = new MonitorThread(1000);
                monitor.start();
            }
        });

        stop.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                isPlaying = false;
                mediaPlayer.stop();
                start.setEnabled(true);
                stop.setEnabled(false);
                try {
                    monitor.join();
                } catch (InterruptedException e) {
                    Log.d(TAG, "stop click error", e);
                }
            }
        });

        Log.d(TAG, "new MediaPlyer()");

        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {
                isPlaying = false;
                start.setEnabled(true);
                stop.setEnabled(false);
                try {
                    monitor.join();
                } catch (InterruptedException e) {
                    Log.e(TAG, "start thread failed.", e);
                }
            }
        });

        Log.d(TAG, "Set data source");
        AssetFileDescriptor fd = null;
        try {
            fd = getResources().openRawResourceFd(R.raw.test);
            mediaPlayer.setDataSource(fd.getFileDescriptor(), fd.getStartOffset(), fd.getLength());
            fd.close();
            Log.d(TAG, "set data source ok");
        } catch (IOException e) {
            Log.e(TAG, "set data source failed.", e);
            finish();
        }

        mediaSeekBar = (SeekBar) findViewById(R.id.mediaSeekBar);
        mediaSeekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress,
                    boolean fromUser) {
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                if (isPlaying) {
                    mediaPlayer.seekTo(seekBar.getProgress());
                }
            }

        });

        Log.d(TAG, "create ok");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private class MonitorThread extends Thread{
        private int interval;

        public MonitorThread(int interval) {
            this.interval = interval;
        }

        public void run(){
            Log.d(TAG, "MonitorThread::run()");
            while(true) {
                if (!isPlaying) return;

                try {
                    sleep(interval);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                handler.sendEmptyMessage(MONITOR_MSG_ID);
            }
        }

    }
}