安卓简单实现视频播放器

package com.tv.tv; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import androidx.constraintlayout.widget.ConstraintLayout; import android.content.ContentResolver; import android.content.Intent; import android.content.pm.ActivityInfo; import android.content.res.Configuration; import android.media.AudioManager; import android.media.MediaPlayer; import android.net.Uri; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.SeekBar; import android.widget.Toast; import java.io.IOException; import java.util.Timer; import java.util.TimerTask; public class MainActivity2 extends AppCompatActivity implements SurfaceHolder.Callback, SeekBar.OnSeekBarChangeListener { private SurfaceView sv; private SurfaceHolder holder; private MediaPlayer mediaplayer; private ConstraintLayout cl; private Timer timer; private TimerTask task; private SeekBar sbar; private ImageView play; private Button back; @Override protected void onCreate(Bundle savedInstanceState) { if(this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT){ setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); } super.onCreate(savedInstanceState); setContentView(R.layout.activity_main2); sv = (SurfaceView) findViewById(R.id.sv); // 得到SurfaceView的容器,界面内容是显示在容器里面的 cl = (ConstraintLayout) findViewById(R.id.cl); play = (ImageView) findViewById(R.id.play); sbar = (SeekBar) findViewById(R.id.sbar); back = findViewById(R.id.back); sbar.setOnSeekBarChangeListener(this); holder = sv.getHolder(); // 过时的APT,如果4.0以上的系统不写没问题,否则必须要写 holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.addCallback(this); // 初始化计时器 timer = new Timer(); back.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent backmain = new Intent(MainActivity2.this, MainActivity.class); startActivity(backmain); finish(); } }); task = new TimerTask() { @Override public void run() { if (mediaplayer != null && mediaplayer.isPlaying()) { int total = mediaplayer.getDuration(); sbar.setMax(total); int progress = mediaplayer.getCurrentPosition(); sbar.setProgress(progress); } else{ play.setImageResource(android.R.drawable.ic_media_pause); } } }; // 设置TimerTask延迟500ms,每隔500ms执行一次 timer.schedule(task, 500, 500); } //播放暂停按钮的点击事件 public void click(View view) { if (mediaplayer != null && mediaplayer.isPlaying()) { mediaplayer.pause(); play.setImageResource(android.R.drawable.ic_media_play); } else { mediaplayer.start(); play.setImageResource(android.R.drawable.ic_media_pause); } } @Override public void surfaceCreated(@NonNull SurfaceHolder holder) { try { mediaplayer = new MediaPlayer(); mediaplayer.setAudioStreamType(AudioManager.STREAM_MUSIC); Uri uri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE+"://"+ getPackageName()+"/"+R.raw.first); try { mediaplayer.setDataSource(MainActivity2.this,uri); } catch (IOException e) { Toast.makeText(MainActivity2.this,"播放失败", Toast.LENGTH_SHORT).show(); e.printStackTrace(); } mediaplayer.setDisplay(holder); mediaplayer.prepareAsync(); mediaplayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() { @Override public void onPrepared(MediaPlayer mp) { mediaplayer.start(); } }); } catch (Exception e) { Toast.makeText(MainActivity2.this, "播放失败", Toast.LENGTH_SHORT).show(); e.printStackTrace(); } } @Override public void surfaceChanged(@NonNull SurfaceHolder holder, int format, int width, int height) { } @Override public void surfaceDestroyed(SurfaceHolder holder) { if(mediaplayer. isPlaying()){ mediaplayer.stop(); } } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { int position = seekBar.getProgress(); if (mediaplayer != null) { mediaplayer.seekTo(position); } } }