Android仿微信选择图片和拍照功能

本文实例为大家分享了 Android微信选择图片的具体代码，和微信拍照功能，供大家参考，具体内容如下

1.Android6.0系统，对于权限的使用都是需要申请，选择图片和拍照需要申请Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE这两个权限。

if (ContextCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
   ActivityCompat.requestPermissions((Activity) this,
     new String[] { Manifest.permission.CAMERA, Manifest.permission.READ_EXTERNAL_STORAGE},
     REQUEST_STORAGE_READ_ACCESS_PERMISSION);
  }

2.通过图片选择器MultiImageSelector来管理: 选择模式、最大选择数量、是否启动相机等功能。

3.点击图片选择按钮跳转到MultiImageSelectorActivity类，其布局如下：（一个Toobar + 一个FrameLayout）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 android:orientation="vertical"
 android:background="#181819"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <android.support.v7.widget.Toolbar
  android:id="@+id/toolbar"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@color/mis_actionbar_color"
  app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
  android:minHeight="?android:attr/actionBarSize">

  <Button
   android:id="@+id/commit"
   android:background="@drawable/mis_action_btn"
   android:minHeight="1dp"
   android:minWidth="1dp"
   android:layout_marginRight="16dp"
   android:paddingLeft="10dp"
   android:paddingRight="10dp"
   android:paddingTop="5dp"
   android:paddingBottom="5dp"
   android:textColor="@color/mis_default_text_color"
   android:textSize="14sp"
   android:layout_gravity="right"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content" />

 </android.support.v7.widget.Toolbar>

 <FrameLayout
  android:id="@+id/image_grid"
  android:layout_width="match_parent"
  android:layout_height="match_parent" />

</LinearLayout>

4.调用如下方法填充展示图片的fragment（MultiImageSelectorFragment）。

   getSupportFragmentManager().beginTransaction()
     .add(R.id.image_grid, Fragment.instantiate(this, MultiImageSelectorFragment.class.getName(), bundle))
     .commit();

5.MultiImageSelectorFragment布局用gridview显示从相册获取的图片

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:background="@android:color/black"
 android:layout_width="match_parent"
 android:layout_height="match_parent">

 <GridView
  android:id="@+id/grid"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:horizontalSpacing="@dimen/mis_space_size"
  android:verticalSpacing="@dimen/mis_space_size"
  android:paddingBottom="?android:attr/actionBarSize"
  android:clipToPadding="false"
  android:numColumns="3"/>

 <RelativeLayout
  android:clickable="true"
  android:id="@+id/footer"
  android:background="#cc000000"
  android:layout_alignParentBottom="true"
  android:layout_width="match_parent"
  android:layout_height="?android:attr/actionBarSize">

  <Button
   android:id="@+id/category_btn"
   android:paddingLeft="16dp"
   android:paddingRight="16dp"
   android:layout_centerVertical="true"
   android:textColor="@color/mis_folder_text_color"
   tools:text="所有图片"
   android:textSize="16sp"
   android:gravity="center_vertical"
   android:drawableRight="@drawable/mis_text_indicator"
   android:drawablePadding="5dp"
   android:background="@null"
   android:singleLine="true"
   android:ellipsize="end"
   android:layout_width="wrap_content"
   android:layout_height="match_parent" />

  </RelativeLayout>

</RelativeLayout>

6调用android.support.v4.app.LoaderManager.class类里面的LoaderCallbacks方法，等加载完成后给mImageAdapter设置数据。

mImageAdapter.setData(images);

7.当允许拍照的时候，显示拍照按钮，调用系统相机功能。

 mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
   @Override
   public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
    if (mImageAdapter.isShowCamera()) {
     if (i == 0) {
      showCameraAction();
     } else {
      Image image = (Image) adapterView.getAdapter().getItem(i);
      selectImageFromGrid(image, mode);
     }
    } else {
     Image image = (Image) adapterView.getAdapter().getItem(i);
     selectImageFromGrid(image, mode);
    }
   }
  });

调用相机功能

 /**
  * Open camera
  */
 private void showCameraAction() {
  if(ContextCompat.checkSelfPermission(getContext(), Manifest.permission.WRITE_EXTERNAL_STORAGE)
    != PackageManager.PERMISSION_GRANTED){
   requestPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE,
     getString(R.string.mis_permission_rationale_write_storage),
     REQUEST_STORAGE_WRITE_ACCESS_PERMISSION);
  }else {
   Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
   if (intent.resolveActivity(getActivity().getPackageManager()) != null) {
    try {
     mTmpFile = FileUtils.createTmpFile(getActivity());
    } catch (IOException e) {
     e.printStackTrace();
    }
    if (mTmpFile != null && mTmpFile.exists()) {
     intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(mTmpFile));
     startActivityForResult(intent, REQUEST_CAMERA);
    } else {
     Toast.makeText(getActivity(), R.string.mis_error_image_not_exist, Toast.LENGTH_SHORT).show();
    }
   } else {
    Toast.makeText(getActivity(), R.string.mis_msg_no_camera, Toast.LENGTH_SHORT).show();
   }
  }
 }

选择图片

 /**
  * notify callback
  * @param image image data
  */
 private void selectImageFromGrid(Image image, int mode) {
  if(image != null) {
   if(mode == MODE_MULTI) {
    if (resultList.contains(image.path)) {
     resultList.remove(image.path);
     if (mCallback != null) {
      mCallback.onImageUnselected(image.path);
     }
    } else {
     if(selectImageCount() == resultList.size()){
      Toast.makeText(getActivity(), R.string.mis_msg_amount_limit, Toast.LENGTH_SHORT).show();
      return;
     }
     resultList.add(image.path);
     if (mCallback != null) {
      mCallback.onImageSelected(image.path);
     }
    }
    mImageAdapter.select(image);
   }else if(mode == MODE_SINGLE){
    if(mCallback != null){
     mCallback.onSingleImageSelected(image.path);
    }
   }
  }
 }

本文已被整理到了《Android微信开发教程汇总》，欢迎大家学习阅读。

源码下载：http://xiazai.jb51.net/201611/yuanma/AndroidselectPicture(jb51.net).rar

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