surfaceView视频播放

最新推荐文章于 2023-11-01 14:09:06 发布

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最新推荐文章于 2023-11-01 14:09:06 发布

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文章标签： null exception path string import class

本文链接：https://blog.youkuaiyun.com/Hknock/article/details/6835165

本文介绍了一个Android平台上的视频播放应用示例，使用了MediaPlayer组件进行视频播放，并实现了播放、暂停等功能。文章展示了如何设置媒体文件路径、构建MediaPlayer对象及设置SurfaceView来显示视频画面。

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import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.LinearLayout;

public class Activity01 extends Activity implements OnBufferingUpdateListener,
        OnCompletionListener, MediaPlayer.OnPreparedListener,
        SurfaceHolder.Callback
{
    private static final String TAG = "Activity01";
    private int mVideoWidth;
    private int mVideoHeight;
    private MediaPlayer mMediaPlayer;

    private SurfaceHolder holder;
    private String path;

    private LinearLayout content;

    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        content = (LinearLayout) findViewById(R.id.content);
        loadData();

        findViewById(R.id.button1).setOnClickListener(new OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                Log.d(TAG, "播放");
                // play
                playVideo();
            }
        });
        findViewById(R.id.button2).setOnClickListener(new OnClickListener()
        {

            @Override
            public void onClick(View v)
            {
                Log.d(TAG, "停止");
                // stop
                if (mMediaPlayer != null)
                {
//                    mMediaPlayer.stop();
                    mMediaPlayer.reset();
                }
            }
        });
    }

    private void loadData()
    {
        SurfaceView mPreview = new SurfaceView(this);
        content.addView(mPreview, new LinearLayout.LayoutParams(
                LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));

        /* 设置媒体文件路径 */
        path = "/sdcard/test.mp4";
        /* 构建MediaPlayer对象 */
        mMediaPlayer = new MediaPlayer();
        mMediaPlayer.setOnBufferingUpdateListener(this);
        mMediaPlayer.setOnCompletionListener(this);
        mMediaPlayer.setOnPreparedListener(this);
        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

        /* 得到SurfaceHolder对象 */
        holder = mPreview.getHolder();
        /* 设置回调函数 */
        holder.addCallback(this);
        /* 设置风格 */
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    private void playVideo()
    {
        Log.d(TAG, "playVideo:");
        try
        {
            mMediaPlayer.setDataSource(path);
            /* 准备 */
            mMediaPlayer.prepare();
            /* 设置事件监听 */
        }
        catch (Exception e)
        {
            Log.e(TAG, "error: " + e.getMessage(), e);
        }
    }

    public void onBufferingUpdate(MediaPlayer arg0, int percent)
    {
        Log.d(TAG, "onBufferingUpdate percent:" + percent);
    }

    public void onCompletion(MediaPlayer arg0)
    {
        Log.d(TAG, "onCompletion called");
    }

    public void onPrepared(MediaPlayer mediaplayer)
    {
        Log.d(TAG, "onPrepared called");
        mVideoWidth = mMediaPlayer.getVideoWidth();
        mVideoHeight = mMediaPlayer.getVideoHeight();
        DisplayMetrics metric = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(metric);
        mVideoWidth = metric.widthPixels;
        mVideoHeight = metric.heightPixels;
        if (mVideoWidth != 0 && mVideoHeight != 0)
        {
            /* 设置视频的宽度和高度 */
            holder.setFixedSize(mVideoWidth, mVideoHeight);
            /* 开始播放 */
            mMediaPlayer.start();
        }

    }

    /* 更改时出发的事件 */
    public void surfaceChanged(SurfaceHolder surfaceholder, int i, int j, int k)
    {
        Log.d(TAG, "surfaceChanged called");

    }

    /* 销毁 */
    public void surfaceDestroyed(SurfaceHolder surfaceholder)
    {
        Log.d(TAG, "surfaceDestroyed called");
        if (mMediaPlayer != null)
        {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }

    }

    /* 当SurfaceHolder创建时触发 */
    public void surfaceCreated(SurfaceHolder holder)
    {
        Log.d(TAG, "surfaceCreated called");
        /* 设置通过SurfaceView来显示画面 */
        mMediaPlayer.setDisplay(holder);
        playVideo();
    }

    /* 销毁 */
    @Override
    protected void onDestroy()
    {
        super.onDestroy();
        if (mMediaPlayer != null)
        {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }

    }
}