Android使用ViewPager加载图片和轮播视频

publicvoidinitData() {

  //把聊天界面的图片和视频找出来，并加到数组中，并在

  //并根据传进来的position来找到视频或图片在数组中的位置

  for(inti =0; i < MsgCount; i++) {

   Msg1 msg1 = fridenMessages.MessageList.get(i);

   if(msg1.getMsg().startsWith(ChatUtil.TAG_IMAGE) || msg1.getMsg().startsWith(ChatUtil.TAG_VIDEO)) {

    ImageUrl.add(msg1.getMsg());

    //查看消息postion对应的图片位置

    if(position == i) {

     position = ImageUrl.size() -1;

     Log.i("TAG","position="+ position);

    }

   }

  }

  Log.i("TAG","position="+ position);

  //把要用到的view加到viewList中

  for(inti =0; i < ImageUrl.size(); i++) {

   if(ImageUrl.get(i).startsWith(ChatUtil.TAG_IMAGE)) {

    PhotoView photoView =newPhotoView(context);

    viewList.add(photoView);

   }elseif(ImageUrl.get(i).startsWith(ChatUtil.TAG_VIDEO)) {

    View view1 = LayoutInflater.from(context).inflate(R.layout.activity_video_player,null);

    SurfaceVideoView videoView = (SurfaceVideoView) view1.findViewById(R.id.videoview);

    intscreenWidth = getScreenWidth((Activity) context);

    intvideoHight = (int) (screenWidth / (MediaRecorderBase.SMALL_VIDEO_WIDTH / (MediaRecorderBase.SMALL_VIDEO_HEIGHT *1.0f)));

//    int videoHight = (int) (screenWidth)*4/3;

    videoView.getLayoutParams().height = videoHight;

    videoView.requestLayout();

    View playStatus = view1.findViewById(R.id.play_status);

    View loading = view1.findViewById(R.id.loading);

    viewList.add(view1);

   }

  }

  adapter =newMyAdapter();

  viewPager.setAdapter(adapter);

  if(position != -1) {

   viewPager.setCurrentItem(position);

  }

 }

```publicvoidinitEvent() {

  //给viewPager设置监听

  viewPager.setOnPageChangeListener(newViewPager.OnPageChangeListener() {

   @Override

   publicvoidonPageSelected(intarg0) {

    intchildCount = viewPager.getChildCount();//viewPager得到页面的数量

    //如果不是在原页面，让原来页面的视频停止播放

    if(position != arg0){

     position=arg0;

     StopVideo();

    }

    // 遍历当前所有加载过的PhotoView，恢复所有图片的默认状态

    for(inti =0; i < childCount; i++) {

     View childAt = viewPager.getChildAt(i);

     try{

      if(childAt !=null&& childAtinstanceofPhotoView) {

       PhotoView photoView = (PhotoView) childAt;

       photoView.setOnPhotoTapListener(newPhotoViewAttacher.OnPhotoTapListener() {

        @Override

        publicvoidonPhotoTap(View view,floatx,floaty) {

         finish();

        }

        @Override

        publicvoidonOutsidePhotoTap() {

        }

       });

      }

     }catch(Exception e) {

      e.printStackTrace();

     }

    }

    if(ImageUrl.get(position).startsWith(ChatUtil.TAG_VIDEO)) {

     String body = ChatApplication.dbHelper.getVideoSdPath(ImageUrl.get(position));

     String url[] = ImageUrl.get(position).substring(ChatUtil.TAG_VIDEO.length()).split("&&");

     View childAt = viewList.get(arg0);

     SurfaceVideoView videoView = (SurfaceVideoView) childAt.findViewById(R.id.videoview);

     mVideoView = videoView;

     mPlayerStatus = childAt.findViewById(R.id.play_status);

     mLoading = childAt.findViewById(R.id.loading);

     Log.i("TAG","videoUrl="+ body);

     setVideoUrl(body, url);

     //延迟50ms，让播放器播放视频时，让它暂停

     Handler handler =newHandler();

     handler.postDelayed(newRunnable() {

      @Override

      publicvoidrun() {

       StopVideo();

      }

     },50);

    }

   }

   @Override

   publicvoidonPageScrolled(intarg0,floatarg1,intarg2) {

    // TODO Auto-generated method stub

   }

   @Override

   publicvoidonPageScrollStateChanged(intarg0) {

    // TODO Auto-generated method stub

   }

  });

 }

 publicclassMyAdapterextendsPagerAdapter {

  @Override

  publicintgetCount() {

   returnImageUrl.size();

  }

  @Override

  publicView instantiateItem(ViewGroup container,intpos) {

   Log.i("TAG","pos="+ pos);

   if(ImageUrl.get(pos).startsWith(ChatUtil.TAG_IMAGE)) {

    PhotoView photoView = (PhotoView) viewList.get(pos);

    container.addView(photoView, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

    String body[] = ImageUrl.get(pos).substring(ChatUtil.TAG_IMAGE.length()).split("&&");

    Log.i("TAG","="+ body[0]);

    ImageLoader.getInstance().displayImage(body[0], photoView);

    photoView.setScaleType(ImageView.ScaleType.FIT_CENTER);//设置图片显示为充满全屏

    photoView.setOnPhotoTapListener(newPhotoViewAttacher.OnPhotoTapListener() {

     @Override

     publicvoidonPhotoTap(View view,floatx,floaty) {

      finish();

     }

     @Override

     publicvoidonOutsidePhotoTap() {

     }

    });

    //   photoView.setOnLongClickListener(longClickListener);

   }elseif(ImageUrl.get(pos).startsWith(ChatUtil.TAG_VIDEO)) {

     View view1 = viewList.get(pos);

    SurfaceVideoView VideoView = (SurfaceVideoView) view1.findViewById(R.id.videoview);

    intscreenWidth = getScreenWidth((Activity) context);

    intvideoHight = (int) (screenWidth / (MediaRecorderBase.SMALL_VIDEO_WIDTH / (MediaRecorderBase.SMALL_VIDEO_HEIGHT *1.0f)));

//    int videoHight = (int) (screenWidth)*4/3;

    VideoView.getLayoutParams().height = videoHight;

    VideoView.requestLayout();

    View PlayerStatus = view1.findViewById(R.id.play_status);

    View Loading = view1.findViewById(R.id.loading);

    VideoView.setOnPreparedListener(ShowBigPictureActivity.this);

    VideoView.setOnPlayStateListener(ShowBigPictureActivity.this);

    VideoView.setOnErrorListener(ShowBigPictureActivity.this);

    VideoView.setOnClickListener(ShowBigPictureActivity.this);

    VideoView.setOnInfoListener(ShowBigPictureActivity.this);

    VideoView.setOnCompletionListener(ShowBigPictureActivity.this);

    container.addView(view1, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

    String body = ChatApplication.dbHelper.getVideoSdPath(ImageUrl.get(pos));

    String url[] = ImageUrl.get(pos).substring(ChatUtil.TAG_VIDEO.length()).split("&&");

    //找到是点击聊天界面哪个视频进来的，将局部成员，付给类成员

    if(pos==position) {

     mVideoView = VideoView;

     mPlayerStatus=PlayerStatus;

     mLoading=Loading;

     setVideoUrl(body,url);

    }

   }

   returnviewList.get(pos);

  }

  @Override

  publicvoiddestroyItem(ViewGroup container,intposition, Object object) {

   container.removeView((View) object);

  }

  @Override

  publicbooleanisViewFromObject(View view, Object object) {

   returnview == object;

  }

 }

以下是控制视频播放的接口：

 publicvoidonCompletion(MediaPlayer mp) {

  onStateChanged(false);

 }

 @Override

 publicbooleanonError(MediaPlayer mp,intwhat,intextra) {

  returnfalse;

 }

 @Override

 publicbooleanonInfo(MediaPlayer mp,intwhat,intextra) {

  switch(what) {

   caseMediaPlayer.MEDIA_INFO_BAD_INTERLEAVING:

    // 音频和视频数据不正确

    ConfigUtil.showShort(context,"视频数据不正确！");

    break;

   caseMediaPlayer.MEDIA_INFO_BUFFERING_START:

    if(!isFinishing())

     mVideoView.pause();

    break;

   caseMediaPlayer.MEDIA_INFO_BUFFERING_END:

    if(!isFinishing())

     mVideoView.start();

    break;

   caseMediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START:

    if(DeviceUtils.hasJellyBean()) {

     mVideoView.setBackground(null);

    }else{

     mVideoView.setBackgroundDrawable(null);

    }

  break;

 }

 returnfalse;

}

 @Override

 publicvoidonStateChanged(booleanisPlaying) {

  mPlayerStatus.setVisibility(isPlaying ? View.GONE : View.VISIBLE);

 }

 @Override

 publicvoidonPrepared(MediaPlayer mp) {

  mVideoView.setVolume(SurfaceVideoView.getSystemVolumn(this));

  mVideoView.start();

  mLoading.setVisibility(View.GONE);

 }

PackageManager pm = getPackageManager();

// FEATURE_CAMERA - 后置相机

// FEATURE_CAMERA_FRONT - 前置相机

if(!pm.hasSystemFeature(PackageManager.FEATURE_CAMERA)

&& !pm.hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) {

    Log.i("camera","non-support");

}else{

    Log.i("camera","support");

}

<?xmlversion="1.0"encoding="utf-8"?>

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"

  xmlns:tools="http://schemas.android.com/tools"

  android:id="@+id/activity_main"

  android:layout_width="match_parent"

  android:layout_height="match_parent"

  android:paddingBottom="@dimen/activity_vertical_margin"

  android:paddingLeft="@dimen/activity_horizontal_margin"

  android:paddingRight="@dimen/activity_horizontal_margin"

  android:paddingTop="@dimen/activity_vertical_margin"

  tools:context="com.itheima74.internetpicturelook.MainActivity">

  <EditText

    android:id="@+id/et_url"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_alignParentLeft="true"

    android:layout_alignParentStart="true"

    android:layout_alignParentTop="true"

    android:hint="请输入图片网址"

    android:inputType="textUri"

    android:text="http://b.hiphotos.baidu.com/image/pic/item/d009b3de9c82d15825ffd75c840a19d8bd3e42da.jpg"/>

  <Button

    android:id="@+id/bt_look"

    android:layout_width="match_parent"

    android:layout_height="wrap_content"

    android:layout_below="@+id/et_url"

    android:text="查看图片"/>

  <ScrollView

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:layout_below="@+id/bt_look"

    android:layout_centerHorizontal="true">

    <ImageView

      android:id="@+id/iv"

      android:layout_width="wrap_content"

      android:layout_height="wrap_content"/>

  </ScrollView>

</RelativeLayout>

packagecom.itheima74.internetpicturelook;

importandroid.graphics.Bitmap;

importandroid.graphics.BitmapFactory;

importandroid.os.Bundle;

importandroid.support.v7.app.AppCompatActivity;

importandroid.view.View;

importandroid.widget.EditText;

importandroid.widget.ImageView;

importandroid.widget.Toast;

importjava.io.IOException;

importjava.io.InputStream;

importjava.net.HttpURLConnection;

importjava.net.URL;

publicclassMainActivityextendsAppCompatActivity {

  privateEditText et_url;

  privateImageView iv;

  @Override

  protectedvoidonCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);

    et_url = (EditText) findViewById(R.id.et_url);

    iv = (ImageView) findViewById(R.id.iv);

    findViewById(R.id.bt_look).setOnClickListener(newView.OnClickListener() {

      @Override

      publicvoidonClick(View v) {

        String path = et_url.getText().toString().trim();

        if(path.isEmpty()) {

          Toast.makeText(MainActivity.this,"请输入图片网址", Toast.LENGTH_SHORT).show();

        }else{

          //开启子线程去网络下载图片

          downLoadPicture(path);

        }

      }

      privatevoiddownLoadPicture(finalString path) {

        // 子线程请求网络

        newThread() {

          @Override

          publicvoidrun() {

            try{

              URL url =newURL(path);

              HttpURLConnection connection = (HttpURLConnection) url.openConnection();

              connection.setRequestMethod("GET");

              connection.setConnectTimeout(5000);

              intresponseCode = connection.getResponseCode();

              if(responseCode ==200) {

                InputStream inputStream = connection.getInputStream();

                finalBitmap bitmap = BitmapFactory.decodeStream(inputStream);

                // 主线程更新UI

                runOnUiThread(newRunnable() {

                  @Override

                  publicvoidrun() {

                    iv.setImageBitmap(bitmap);

                  }

                });

              }

            }catch(IOException e) {

              e.printStackTrace();

            }

          }

        }.start();

      }

    });

  }

}