content: package com.lzy.imagepicker.ui;
  
  import android.content.DialogInterface;
  import android.content.Intent;
  import android.os.Build;
  import android.os.Bundle;
  import android.support.v4.view.ViewPager;
  import android.support.v7.app.AlertDialog;
  import android.view.View;
  import android.view.animation.AnimationUtils;
  import android.widget.ImageView;
  
  import com.lzy.imagepicker.ImagePicker;
  import com.lzy.imagepicker.R;
  
  /**
   * ================================================
   * 作    者：jeasonlzy（廖子尧），ikkong （ikkong@163.com）
   * 版    本：1.0
   * 创建日期：2016/5/19
   * 描    述：
   * 修订历史：预览已经选择的图片，并可以删除, 感谢 ikkong 的提交
   * ================================================
   */
  public class ImagePreviewDelActivity extends ImagePreviewBaseActivity implements View.OnClickListener {
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
  
          ImageView mBtnDel = (ImageView) findViewById(R.id.btn_del);
          mBtnDel.setOnClickListener(this);
          mBtnDel.setVisibility(View.VISIBLE);
          topBar.findViewById(R.id.btn_back).setOnClickListener(this);
  
          mTitleCount.setText(getString(R.string.preview_image_count, mCurrentPosition + 1, mImageItems.size()));
          //滑动ViewPager的时候，根据外界的数据改变当前的选中状态和当前的图片的位置描述文本
          mViewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
              @Override
              public void onPageSelected(int position) {
                  mCurrentPosition = position;
                  mTitleCount.setText(getString(R.string.preview_image_count, mCurrentPosition + 1, mImageItems.size()));
              }
          });
      }
  
      @Override
      public void onClick(View v) {
          int id = v.getId();
          if (id == R.id.btn_del) {
              showDeleteDialog();
          } else if (id == R.id.btn_back) {
              onBackPressed();
          }
      }
  
      /** 是否删除此张图片 */
      private void showDeleteDialog() {
          AlertDialog.Builder builder = new AlertDialog.Builder(this);
          builder.setTitle("提示");
          builder.setMessage("要删除这张照片吗？");
          builder.setNegativeButton("取消", null);
          builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                  //移除当前图片刷新界面
                  mImageItems.remove(mCurrentPosition);
                  if (mImageItems.size() > 0) {
                      mAdapter.setData(mImageItems);
                      mAdapter.notifyDataSetChanged();
                      mTitleCount.setText(getString(R.string.preview_image_count, mCurrentPosition + 1, mImageItems.size()));
                  } else {
                      onBackPressed();
                  }
              }
          });
          builder.show();
      }
  
      @Override
      public void onBackPressed() {
          Intent intent = new Intent();
          //带回最新数据
          intent.putExtra(ImagePicker.EXTRA_IMAGE_ITEMS, mImageItems);
          setResult(ImagePicker.RESULT_CODE_BACK, intent);
          finish();
          super.onBackPressed();
      }
  
      /** 单击时，隐藏头和尾 */
      @Override
      public void onImageSingleTap() {
          if (topBar.getVisibility() == View.VISIBLE) {
              topBar.setAnimation(AnimationUtils.loadAnimation(this, com.lzy.imagepicker.R.anim.top_out));
              topBar.setVisibility(View.GONE);
              tintManager.setStatusBarTintResource(com.lzy.imagepicker.R.color.transparent);//通知栏所需颜色
              //给最外层布局加上这个属性表示，Activity全屏显示，且状态栏被隐藏覆盖掉。
              if (Build.VERSION.SDK_INT >= 16) content.setSystemUiVisibility(View.SYSTEM_UI_FLAG_FULLSCREEN);
          } else {
              topBar.setAnimation(AnimationUtils.loadAnimation(this, com.lzy.imagepicker.R.anim.top_in));
              topBar.setVisibility(View.VISIBLE);
              tintManager.setStatusBarTintResource(com.lzy.imagepicker.R.color.status_bar);//通知栏所需颜色
              //Activity全屏显示，但状态栏不会被隐藏覆盖，状态栏依然可见，Activity顶端布局部分会被状态遮住
              if (Build.VERSION.SDK_INT >= 16) content.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
          }
      }
  }