Android 之实现类似QQ图片说说照片选择

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Android 之实现类似QQ图片说说照片选择

转载请注明出处：http://blog.csdn.net/klxh2009/article/details/51254771 本文出自【付小华的博客】

• 效果展示
• 布局文件
• 代码实现

---

效果展示

布局文件

布局是很简单的，一个GridView，直接上布局：

layout/activity_add_photo.xml

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

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="60dp"
        android:background="#00BB9C">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="写动态"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="@android:color/white" />

        <TextView
            android:id="@+id/send"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:layout_marginRight="10dp"
            android:text="发送"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="@android:color/white" />

    </RelativeLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="16dp"
        android:orientation="vertical">

        <EditText
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:enabled="false"
            android:focusable="false"
            android:gravity="top"
            android:hint="分享您的那点新鲜事儿..."
            android:maxLines="5" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:padding="5dp">

            <GridView
                android:id="@+id/gridview"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:numColumns="4" />

        </LinearLayout>       

    </LinearLayout>

</LinearLayout>

layout/activity_add_photo_gv_items.xml 使用了自定义的view使得布局为正方形

<?xml version="1.0" encoding="utf-8"?>
<com.shenhua.tabhostdemo.selectimg.SquareRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/main_gridView_item_photo"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        android:contentDescription="@null"
        android:padding="5dp"
        android:scaleType="fitXY" />

    <CheckBox
        android:id="@+id/main_gridView_item_cb"
        android:layout_width="20dp"
        android:layout_height="20dp"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_margin="2dp"
        android:background="@drawable/ic_delete"
        android:backgroundTint="#00BB9C"
        android:button="@null" />

</com.shenhua.tabhostdemo.selectimg.SquareRelativeLayout>

代码实现

SquareRelativeLayout.java：

package com.shenhua.tabhostdemo.selectimg;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

/**
 * 自定义方形布局
 * Created by Shenhua on 4/25/2016.
 */
public class SquareRelativeLayout extends RelativeLayout {
    public SquareRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public SquareRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public SquareRelativeLayout(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(getDefaultSize(0, widthMeasureSpec), getDefaultSize(0, heightMeasureSpec));
        int childWidthSize = getMeasuredWidth();
        widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidthSize, MeasureSpec.EXACTLY);
        heightMeasureSpec = widthMeasureSpec;
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

UploadPhotoActivity.java： 主Activity

package com.shenhua.tabhostdemo.selectimg;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.shenhua.tabhostdemo.R;

import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * Created by shenhua on 4/25/2016.
 */
public class UploadPhotoActivity extends AppCompatActivity {

    private static final int IMG_COUNT = 8;
    private static final String IMG_ADD_TAG = "a";
    private GridView gridView;
    private GVAdapter adapter;
    private TextView textView;
    private ImageView img;
    private List<String> list;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_add_photo);
        gridView = (GridView) findViewById(R.id.gridview);
        textView = (TextView) findViewById(R.id.send);
        textView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                System.out.println("发送：" + Integer.toString(list.size() - 1));
                upLoad();
            }
        });
        initData();
    }

    private void upLoad() {
        Bitmap bitmap;
        Bitmap bmpCompressed;
        for (int i = 0; i < list.size() - 1; i++) {
            bitmap = BitmapFactory.decodeFile(list.get(i));
            bmpCompressed = Bitmap.createScaledBitmap(bitmap, 640, 480, true);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bmpCompressed.compress(Bitmap.CompressFormat.JPEG, 100, bos);
            byte[] data = bos.toByteArray();
            System.out.println(data);
        }

    }

    private void initData() {
        if (list == null) {
            list = new ArrayList<>();
            list.add(IMG_ADD_TAG);
        }
        adapter = new GVAdapter();
        gridView.setAdapter(adapter);
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (list.get(position).equals(IMG_ADD_TAG)) {
                    if (list.size() < IMG_COUNT) {
                        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
                        startActivityForResult(i, 0);
                    } else
                        Toast.makeText(UploadPhotoActivity.this, "最多只能选择7张照片！", Toast.LENGTH_SHORT).show();
                }
            }
        });
        refreshAdapter();
    }

    private void refreshAdapter() {
        if (list == null) {
            list = new ArrayList<>();
        }
        if (adapter == null) {
            adapter = new GVAdapter();
        }
        adapter.notifyDataSetChanged();
    }

    private class GVAdapter extends BaseAdapter {

        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return null;
        }

        @Override
        public long getItemId(int position) {
            return 0;
        }

        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            final ViewHolder holder;
            if (convertView == null) {
                convertView = LayoutInflater.from(getApplication()).inflate(R.layout.activity_add_photo_gv_items, parent, false);
                holder = new ViewHolder();
                holder.imageView = (ImageView) convertView.findViewById(R.id.main_gridView_item_photo);
                holder.checkBox = (CheckBox) convertView.findViewById(R.id.main_gridView_item_cb);
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }
            String s = list.get(position);
            if (!s.equals(IMG_ADD_TAG)) {
                holder.checkBox.setVisibility(View.VISIBLE);
                holder.imageView.setImageBitmap(ImageTool.createImageThumbnail(s));
            } else {
                holder.checkBox.setVisibility(View.GONE);
                holder.imageView.setImageResource(R.mipmap.ic_photo_upload);
            }
            holder.checkBox.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    list.remove(position);
                    refreshAdapter();
                }
            });
            return convertView;
        }

        private class ViewHolder {
            ImageView imageView;
            CheckBox checkBox;
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (data == null) {
            System.out.println("data null");
            return;
        }
        if (requestCode == 0) {
            final Uri uri = data.getData();
            String path = ImageTool.getImageAbsolutePath(this, uri);
            System.out.println(path);
            if (list.size() == IMG_COUNT) {
                removeItem();
                refreshAdapter();
                return;
            }
            removeItem();
            list.add(path);
            list.add(IMG_ADD_TAG);
            refreshAdapter();
        }
    }

    private void removeItem() {
        if (list.size() != IMG_COUNT) {
            if (list.size() != 0) {
                list.remove(list.size() - 1);
            }
        }
    }

}

ImageTool.java： 图片工具类

package com.shenhua.tabhostdemo.selectimg;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
 * Created by shenhua on 4/26/2016.
 */
public class ImageTool {

    /**
     * 获取图片的绝对路径，需要添加用户权限
     */
    @TargetApi(19)
    public static String getImageAbsolutePath(Activity context, Uri imageUri) {
        if (context == null || imageUri == null)
            return null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
            if (isExternalStorageDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                String type = split[0];
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            } else if (isDownloadsDocument(imageUri)) {
                String id = DocumentsContract.getDocumentId(imageUri);
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
                return getDataColumn(context, contentUri, null, null);
            } else if (isMediaDocument(imageUri)) {
                String docId = DocumentsContract.getDocumentId(imageUri);
                String[] split = docId.split(":");
                String type = split[0];
                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = null;//不获取视频
                } else if ("audio".equals(type)) {
                    contentUri = null;//不获取音频
                }
                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = new String[]{split[1]};
                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        } // MediaStore (and general)
        else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
            if (isGooglePhotosUri(imageUri))
                return imageUri.getLastPathSegment();
            return getDataColumn(context, imageUri, null, null);
        }
        // File
        else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
            return imageUri.getPath();
        }
        return null;
    }

    public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        String column = MediaStore.Images.Media.DATA;
        String[] projection = {column};
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int index = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(index);
            }
        } finally {
            if (cursor != null)
                cursor.close();
        }
        return null;
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is ExternalStorageProvider.
     */
    public static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is DownloadsProvider.
     */
    public static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is MediaProvider.
     */
    public static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }

    /**
     * @param uri The Uri to check.
     * @return Whether the Uri authority is Google Photos.
     */
    public static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }

    /**
     * 创建图片缩略图
     *
     * @param filePath
     * @return
     */
    public static Bitmap createImageThumbnail(String filePath) {
        Bitmap bitmap = null;
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(filePath, opts);
        opts.inSampleSize = computeSampleSize(opts, -1, 128 * 128);
        opts.inJustDecodeBounds = false;
        try {
            bitmap = BitmapFactory.decodeFile(filePath, opts);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return bitmap;
    }

    public static int computeSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
        int initialSize = computeInitialSampleSize(options, minSideLength, maxNumOfPixels);
        int roundedSize;
        if (initialSize <= 8) {
            roundedSize = 1;
            while (roundedSize < initialSize) {
                roundedSize <<= 1;
            }
        } else {
            roundedSize = (initialSize + 7) / 8 * 8;
        }
        return roundedSize;
    }

    private static int computeInitialSampleSize(BitmapFactory.Options options, int minSideLength, int maxNumOfPixels) {
        double w = options.outWidth;
        double h = options.outHeight;
        int lowerBound = (maxNumOfPixels == -1) ? 1 : (int) Math.ceil(Math.sqrt(w * h / maxNumOfPixels));
        int upperBound = (minSideLength == -1) ? 128 : (int) Math.min(Math.floor(w / minSideLength), Math.floor(h / minSideLength));
        if (upperBound < lowerBound) {
            // return the larger one when there is no overlapping zone.
            return lowerBound;
        }
        if ((maxNumOfPixels == -1) && (minSideLength == -1)) {
            return 1;
        } else if (minSideLength == -1) {
            return lowerBound;
        } else {
            return upperBound;
        }
    }
}

• 因为 Android4.4以上版本获得的图片URI是com.xxxxx的，因此需要在工具类里做判断，否则得不到图片的绝对地址。
• 工具类参考了别人的一篇博客，忘了留博客地址了 请原博主谅解。
• 最后需要加上一个权限：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />