实验6 201306114104彭得源

实验报告

课程名称		基于Android平台移动互联网开发		实验日期	16/04/15
实验项目名称		实验6		实验地点	S3010
实验类型		□验证型    √设计型    □综合型		学  时
一、实验目的及要求（本实验所涉及并要求掌握的知识点）
实现在应用程序中处理音频和视频。
二、实验环境（本实验所使用的硬件设备和相关软件）
Android资源管理机制。
三、实验内容及步骤
1）新建工程  2）修改布局文件main.xml 3）完善Activity类
四、实验结果（本实验源程序清单及运行结果或实验结论、实验设计图）
代码：实验代码 package com.example.mediaplay;   import java.io.File; import java.io.IOException;     import android.media.MediaPlayer; import android.os.Bundle; import android.os.Environment; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.MediaController; import android.widget.VideoView;   public class MainActivity extends Activity { private Button btnStartResours,btnStartLocal,btnStartnet,btnStop,btnQuit,btnplayvideo; private VideoView video; public MediaPlayer mediaplayer= new MediaPlayer();        private File file,filevideo; @Override          protected void onCreate(Bundle savedInstanceState) {                    super.onCreate(savedInstanceState);                    setContentView(R.layout.activity_main);                    btnStartResours=(Button)findViewById(R.id.button1);                    btnStartLocal=(Button)findViewById(R.id.button2);                    btnStartnet=(Button)findViewById(R.id.button3);                    btnStop=(Button)findViewById(R.id.button4);                                    btnQuit=(Button)findViewById(R.id.button5);                    btnplayvideo=(Button)findViewById(R.id.playvideobtn);                                       video=(VideoView)findViewById(R.id.videoView1);                    file = new File(Environment.getExternalStorageDirectory().getPath()+"/nan.mp3");                    filevideo = new File(Environment.getExternalStorageDirectory().getPath()+"/videoviewdemo.mp4");                                                          btnStartResours.setOnClickListener(new OnClickListener() {                                                         @Override                             public void onClick(View arg0) {                                      // TODO Auto-generated method stub                                                                                                                mediaplayer=MediaPlayer.create(MainActivity.this, R.raw.nan);                                      mediaplayer.start();                             }                    });                    btnStartLocal.setOnClickListener(new OnClickListener() {                                                         @Override                             public void onClick(View arg0) {                                      // TODO Auto-generated method stub                                                                           mediaplayer.reset();                                      try {                                                mediaplayer.setDataSource(file.getAbsolutePath());                                                mediaplayer.prepare();                                                mediaplayer.start();                                                                                     } catch (IllegalArgumentException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (SecurityException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (IllegalStateException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (IOException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      }                                                                  }                    });                    btnStartnet.setOnClickListener(new OnClickListener() {                                                         @Override                             public void onClick(View arg0) {                                      // TODO Auto-generated method stub                                      file = new File("http://bd.kuwo.cn/yinyue/1043947?from=baidu");                                      try {                                                mediaplayer.setDataSource(file.getAbsolutePath());                                                mediaplayer.prepare();                                                mediaplayer.start();                                      } catch (IllegalArgumentException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (SecurityException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (IllegalStateException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      } catch (IOException e) {                                                // TODO Auto-generated catch block                                                e.printStackTrace();                                      }                             }                    });                    btnStop.setOnClickListener(new OnClickListener() {                                                         @Override                             public void onClick(View arg0) {                                      // TODO Auto-generated method stub                                      if(mediaplayer.isPlaying()){                                                mediaplayer.stop();                                      }                                                                  }                    });                    btnQuit.setOnClickListener(new OnClickListener() {                                                         @Override                             public void onClick(View arg0) {                                      // TODO Auto-generated method stub                                      onDestroy();                                      finish();                             }                    });                    MediaController mc = new MediaController(MainActivity.this);                    if(file.exists()){                             video.setVideoPath(filevideo.getAbsolutePath());                             video.setMediaController(mc);                             video.requestFocus();                             btnplayvideo.setOnClickListener(new OnClickListener() {                                                                           @Override                                      public void onClick(View arg0) {                                                // TODO Auto-generated method stub                                                video.start();                                                                                     }                             });                                                }                             } @Override          protected void onDestroy() {                    // TODO Auto-generated method stub                    mediaplayer.stop();                    super.onDestroy();          }            @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;          }   }   运行结果：（截图）：
五、实验总结（对本实验结果进行分析，实验心得体会及改进意见）
学会了播放视频和音乐。 喜欢下次老师可以一边讲我们一边做，老师把演示窗口化，我们就可以跟着老师的步骤一边听一边做了。
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