android surfaceView实现播放视频功能

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  tools:context=".mainactivity">

  <com.example.examday11_4_1.surfaceview.mysurfaceview
    android:id="@+id/sv"
    android:layout_width="match_parent"
    android:layout_height="250dp" />

  <textview
    android:id="@+id/te_nowtiem"
    android:textcolor="#fff"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignbottom="@id/sv"
    android:layout_marginleft="60dp"
    android:layout_marginbottom="10dp"
    android:text="00:00" />

  <seekbar
    android:id="@+id/sb"
    android:layout_width="200dp"
    android:layout_height="wrap_content"
    android:layout_alignbottom="@id/sv"
    android:layout_centerhorizontal="true"
    android:layout_marginbottom="10dp" />

  <textview
    android:id="@+id/te_alltiem"
    android:textcolor="#fff"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignbottom="@id/sv"
    android:layout_marginleft="320dp"
    android:layout_marginbottom="10dp"
    android:text="00:00" />

  <button
    android:id="@+id/but_play"
    android:layout_width="50dp"
    android:layout_height="40dp"
    android:layout_alignbottom="@+id/sv"
    android:layout_marginleft="10dp"
    android:text="s/p"
    android:textsize="10sp" />

</relativelayout>

package com.example.examday11_4_1.surfaceview;

import android.content.context;
import android.media.mediaplayer;
import android.util.attributeset;
import android.view.surfaceholder;
import android.view.surfaceview;

import java.io.ioexception;
import java.text.simpledateformat;

public class mysurfaceview extends surfaceview implements surfaceholder.callback {
  private surfaceholder surfaceholder;
  private mediaplayer mediaplayer;

  public mysurfaceview(context context) {
    super(context);
  }

  public mysurfaceview(context context, attributeset attrs) {
    super(context, attrs);
    surfaceholder = getholder();
    surfaceholder.addcallback(this);
    if (mediaplayer == null){
      mediaplayer = new mediaplayer();
    }
  }

  public mysurfaceview(context context, attributeset attrs, int defstyleattr) {
    super(context, attrs, defstyleattr);
  }

  public mysurfaceview(context context, attributeset attrs, int defstyleattr, int defstyleres) {
    super(context, attrs, defstyleattr, defstyleres);
  }

  public void setdatapath(string path){
    mediaplayer.reset();
    try {
      mediaplayer.setdatasource(path);
      mediaplayer.prepareasync();
      mediaplayer.setonpreparedlistener(new mediaplayer.onpreparedlistener() {
        @override
        public void onprepared(mediaplayer mp) {
          mediaplayer.start();
        }
      });
    } catch (ioexception e) {
      e.printstacktrace();
    }
  }


  @override
  public void surfacecreated(surfaceholder holder) {
    mediaplayer.setdisplay(surfaceholder);
  }

  @override
  public void surfacechanged(surfaceholder holder, int format, int width, int height) {

  }

  @override
  public void surfacedestroyed(surfaceholder holder) {
    if (mediaplayer!=null){
      mediaplayer.release();
      mediaplayer = null;
    }
  }

  //暂停/开始播放
  public void playorno(){
    if (mediaplayer!=null){
      if (mediaplayer.isplaying()){
        mediaplayer.pause();
      }else {
        mediaplayer.start();
      }
    }
  }

  //拖动更新进度
  public void seekto(int progress){
    if (mediaplayer!=null){
      int duration = mediaplayer.getduration();
      int current = progress * duration /100;
      mediaplayer.seekto(current);
    }
  }

  //获取播放进度
  public int getprogress(){
    if (mediaplayer!=null){
      int druation = mediaplayer.getduration();
      int currentposition = mediaplayer.getcurrentposition();
      int progress = currentposition * 100 / druation;
      return progress;
    }
    return 0;
  }

  //获取播放时长
  public string getcurrenttime(){
    if (mediaplayer!=null){
      long currentpostion = mediaplayer.getcurrentposition();
      simpledateformat format = new simpledateformat("mm:ss");
      string f = format.format(currentpostion);
      return f+"";

    }
    return "";
  }

  //获取时长
  public string getduration(){
    if (mediaplayer!=null){
      long duration = mediaplayer.getduration();
      simpledateformat format = new simpledateformat("mm:ss");
      return format.format(duration)+"";
    }
    return "";
  }

}

package com.example.examday11_4_1;

import android.manifest;
import android.os.build;
import android.os.bundle;
import android.os.handler;
import android.view.view;
import android.widget.button;
import android.widget.seekbar;
import android.widget.textview;

import androidx.appcompat.app.appcompatactivity;

import com.example.examday11_4_1.surfaceview.mysurfaceview;

import java.util.timer;
import java.util.timertask;

public class mainactivity extends appcompatactivity {

  private mysurfaceview mysurfaceview;
  private textview tenowtiem;
  private seekbar sb;
  private textview tealltiem;
  private button butplay;
  private timer timer;
  private handler handler = new handler();
  private string path ="http://uvideo.spriteapp.cn/video/2019/0512/56488d0a-7465-11e9-b91b-1866daeb0df1_wpd.mp4";

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
    if (build.version.sdk_int>=build.version_codes.m){
      requestpermissions(new string[]{
          manifest.permission.read_external_storage
      },100);
    }
    initview();
    inittimer();

  }

  private void inittimer() {
    timer = new timer();
    timer.schedule(new timertask() {
      @override
      public void run() {
        final string currenttime = mysurfaceview.getcurrenttime();
        final string duration = mysurfaceview.getduration();
        final int progress = mysurfaceview.getprogress();
        handler.post(new runnable() {
          @override
          public void run() {
            sb.setprogress(progress);//设置进度条
            tealltiem.settext(duration);//设置总时长
            tenowtiem.settext(currenttime);//设置当前时长
          }
        });
      }
    },0,100);
  }

  private void initview() {
    mysurfaceview = (mysurfaceview) findviewbyid(r.id.sv);
    mysurfaceview.setdatapath(path);
    tenowtiem = (textview) findviewbyid(r.id.te_nowtiem);
    sb = (seekbar) findviewbyid(r.id.sb);
    tealltiem = (textview) findviewbyid(r.id.te_alltiem);
    butplay = (button) findviewbyid(r.id.but_play);

    //设置拖动
    sb.setonseekbarchangelistener(new seekbar.onseekbarchangelistener() {
      @override
      public void onprogresschanged(seekbar seekbar, int progress, boolean fromuser) {
        if (fromuser){
          mysurfaceview.seekto(progress);//视频播放拖动
        }
      }

      @override
      public void onstarttrackingtouch(seekbar seekbar) {

      }

      @override
      public void onstoptrackingtouch(seekbar seekbar) {

      }
    });

    //暂停播放
    butplay.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        mysurfaceview.playorno();
      }
    });

  }
}