1、基本使用

  • MediaPlayer主要用于播放音频，没有提供图像输出界面，所以我们需要借助其他的 组件来显示MediaPlayer播放的图像输出，我们可以使用用SurfaceView
  • 代码逻辑 ```json package com.xinhe.androidd;

import androidx.appcompat.app.AppCompatActivity;

import android.media.MediaPlayer; import android.os.Bundle; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {

  1. private static final String TAG = "MainActivity";
  3. private MediaPlayer mediaPlayer;
  5. private SurfaceView surfaceView;
  7. @Override
  8. protected void onCreate(Bundle savedInstanceState) {
  9.     super.onCreate(savedInstanceState);
  10.     setContentView(R.layout.activity_main);
  12.     surfaceView = findViewById(R.id.surface);
  13.     surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
  14.         @Override
  15.         public void surfaceCreated(SurfaceHolder holder) {
  16.             Log.d(TAG, "surfaceCreated: "+holder.toString());
  17.         }
  19.         @Override
  20.         public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
  21.             Log.d(TAG, "surfaceCreated:  format = " + format + ", width = " + width + ", height = " + height);
  22.         }
  24.         @Override
  25.         public void surfaceDestroyed(SurfaceHolder holder) {
  26.             Log.d(TAG, "surfaceCreated: "+holder.toString());
  27.         }
  28.     });
  29. }
  31. public void play(View view) {
  32.     try {
  33.         mediaPlayer = new MediaPlayer();
  34.         mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
  35.             @Override
  36.             public void onPrepared(MediaPlayer mp) {
  37.                 mediaPlayer.start();
  38.             }
  39.         });
  40.         mediaPlayer.setDisplay(surfaceView.getHolder());
  41.         mediaPlayer.setDataSource("http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4");
  42.         mediaPlayer.prepareAsync();
  44.     } catch (IOException e) {
  45.         Log.e(TAG, "start: " + e.toString());
  46.         e.printStackTrace();
  47.     }
  48. }

}

  2. - 布局文件
  3. ```json
  4. <?xml version="1.0" encoding="utf-8"?>
  5. <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
  6.     xmlns:app="http://schemas.android.com/apk/res-auto"
  7.     xmlns:tools="http://schemas.android.com/tools"
  8.     android:layout_width="match_parent"
  9.     android:layout_height="match_parent"
  10.     tools:context=".MainActivity">
  12.     <SurfaceView
  13.         android:id="@+id/surface"
  14.         app:layout_constraintLeft_toLeftOf="parent"
  15.         app:layout_constraintTop_toTopOf="parent"
  16.         android:layout_width="match_parent"
  17.         android:layout_height="300dp"/>
  19.     <Button
  20.         android:onClick="play"
  21.         app:layout_constraintLeft_toLeftOf="parent"
  22.         app:layout_constraintTop_toBottomOf="@id/surface"
  23.         android:layout_width="match_parent"
  24.         android:layout_height="wrap_content"/>
  26. </androidx.constraintlayout.widget.ConstraintLayout>