本文实例为大家分享了Android实现QQ图片说说照片选择的具体代码,供大家参考,具体内容如下
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" />
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持亿速云。
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