一、说在前面
昨天完成了图片的读取，遇到的问题有很多。不过都解决了，今天干了一天的活都忘掉了，就应该遇到一个bug截个图。T_T
今天把图片的褪色和将自己的功能加到团队的项目里面。
二、思路
将图片褪色的功能对接到读取图片出来的界面后面，对读出来的图片进行处理。和队友一起商量着把我的功能加到哪里。
三、代码
package com.example.imgpicker; import android.Manifest; import android.content.Intent; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.os.Build; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.ImageView; import androidx.annotation.NonNull; import androidx.annotation.RequiresApi; import androidx.appcompat.app.AppCompatActivity; import androidx.recyclerview.widget.GridLayoutManager; import androidx.recyclerview.widget.RecyclerView; import com.example.imgpicker.Adapter.ResultImageAdapter; import com.example.imgpicker.domain.ImageItem; import com.example.imgpicker.utils.PickerConfig; import java.lang.ref.WeakReference; import java.util.List; @RequiresApi(api = Build.VERSION_CODES.M) public class MainActivity extends AppCompatActivity implements PickerConfig.OnImageSelectFinishListener { private static final int MAX_SELECTED_COUNT = 1; private static final String TAG = "MainActivity"; private static final int PERMISSION_REQUEST_CODE = 1; RecyclerView result_list; ResultImageAdapter resultImageAdapter; ImageView last_iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); checkPermission(); initPickerConfig(); } private void initView() { result_list = findViewById(R.id.result_list); last_iv =findViewById(R.id.last_iv); resultImageAdapter = new ResultImageAdapter(); result_list.setAdapter(resultImageAdapter); } private void initPickerConfig() { PickerConfig picker=PickerConfig.getInstance(); //设置最大值 picker.setMaxSelectedCount(MAX_SELECTED_COUNT); picker.setOnImageSelectFinishListener(this); } private void checkPermission() { int readExStoragePermissionRest = checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE); if (readExStoragePermissionRest!= PackageManager.PERMISSION_GRANTED){ //没有权限 requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},PERMISSION_REQUEST_CODE); } } @Override public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { super.onRequestPermissionsResult(requestCode, permissions, grantResults); if (requestCode==PERMISSION_REQUEST_CODE){ if (grantResults.length==0&&grantResults[0]== PackageManager.PERMISSION_GRANTED) { //有权限 }else { //没有权限 //根据交互去处理 } } } public void pickImgs(View view){ // 打开另外一个界面 startActivity(new Intent(this,PickerAvtivity.class)); } @Override public void onSelectedFinished(List<ImageItem> result) { //返回来的数据显示出来 for (ImageItem imageItem : result) { Log.d(TAG, " item----> "+imageItem); } int horizentalCount; if(result.size()<3){ horizentalCount=result.size(); }else { horizentalCount=3; } ImageItem i=result.get(0); func(i.getPath(),i.getW(),i.getH()); } //褪色处理 public void func(String path,int w,int h) { Bitmap bitmap = convertToBitmap(path,w,h); // int width = bitmap.getWidth(); // int height = bitmap.getHeight(); Bitmap base = bitmap.copy(Bitmap.Config.ARGB_8888, true); // Bitmap B=toGrayscale(base); Canvas canvas = new Canvas(base);//以base为模板创建canvas对象 canvas.drawBitmap(bitmap, new Matrix(),new Paint()); for(int i = 0; i < base.getWidth(); i++)//遍历像素点 { for(int j = 0; j < base.getHeight()*0.5; j++) { int color = bitmap.getPixel(i, j); int r = Color.red(color); int g = Color.green(color); int b = Color.blue(color); int a = Color.alpha(color); int avg = (r+g+b)/3;//RGB均值 r= (int) (r/3); g=(int)(g/3); b=(int)(b/3); base.setPixel(i, j,Color.argb(a, r, g, b)); // if(avg >= 100)//100可以理解为经验值 // { // base.setPixel(i, j,Color.argb(a, 255, 255, 255));//设为白色 // } // else // { // base.setPixel(i, j,Color.argb(a, 0, 0, 0));//设为黑色 // } } } bitmap.recycle(); last_iv.setImageBitmap(base); } public static Bitmap convertToBitmap(String path, int w, int h) { BitmapFactory.Options opts = new BitmapFactory.Options(); // 设置为ture只获取图片大小 opts.inJustDecodeBounds = true; opts.inPreferredConfig = Bitmap.Config.ARGB_8888; // 返回为空 BitmapFactory.decodeFile(path, opts); int width = opts.outWidth; int height = opts.outHeight; float scaleWidth = 0.f, scaleHeight = 0.f; if (width > w || height > h) { // 缩放 scaleWidth = ((float) width) / w; scaleHeight = ((float) height) / h; } opts.inJustDecodeBounds = false; float scale = Math.max(scaleWidth, scaleHeight); opts.inSampleSize = (int)scale; WeakReference<Bitmap> weak = new WeakReference<Bitmap>(BitmapFactory.decodeFile(path, opts)); return Bitmap.createScaledBitmap(weak.get(), w, h, true); } }
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <ImageView android:layout_width="wrap_content" android:id="@+id/back_press_iv" android:src="@mipmap/pick_black_back" android:padding="10dp" android:layout_height="wrap_content"/> <TextView android:layout_width="wrap_content" android:layout_centerVertical="true" android:id="@+id/finish_tv" android:layout_alignParentRight="true" android:layout_marginRight="10dp" android:text="(0/1)完成" android:textColor="#000000" android:layout_height="wrap_content"/> </RelativeLayout> <androidx.recyclerview.widget.RecyclerView android:layout_width="match_parent" android:id="@+id/image_list_view" android:layout_height="match_parent"/> </LinearLayout>
package com.example.imgpicker.Adapter; import android.graphics.Point; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import androidx.annotation.NonNull; import androidx.recyclerview.widget.RecyclerView; import com.bumptech.glide.Glide; import com.example.imgpicker.R; import com.example.imgpicker.domain.ImageItem; import com.example.imgpicker.utils.SizeUtils; import java.util.ArrayList; import java.util.List; public class ResultImageAdapter extends RecyclerView.Adapter<ResultImageAdapter.InnerHolder> { private List<ImageItem> mImageItems=new ArrayList<>(); private int horizentalCount=1; @NonNull @Override public ResultImageAdapter.InnerHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_image, parent, false); itemView.findViewById(R.id.image_check_box).setVisibility(View.GONE); return new InnerHolder(itemView); } @Override public void onBindViewHolder(@NonNull ResultImageAdapter.InnerHolder holder, int position) { View itemView = holder.itemView; Point point = SizeUtils.getScreenSize(itemView.getContext()); RecyclerView.LayoutParams layoutParams=new RecyclerView.LayoutParams(point.x/horizentalCount,point.x/horizentalCount); itemView.setLayoutParams(layoutParams); ImageView imageView =itemView.findViewById(R.id.image_iv); ImageItem imageItem = mImageItems.get(position); Glide.with(imageView.getContext()).load(imageItem.getPath()).into(imageView); } @Override public int getItemCount() { return mImageItems.size(); } public void setData(List<ImageItem> result, int horizentalCount) { this.horizentalCount=horizentalCount; mImageItems.clear(); mImageItems.addAll(result); notifyDataSetChanged(); } public class InnerHolder extends RecyclerView.ViewHolder { public InnerHolder(@NonNull View itemView) { super(itemView); } } }
package com.example.imgpicker; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.os.Bundle; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.widget.ImageView; import android.widget.TextView; import androidx.annotation.NonNull; import androidx.annotation.Nullable; import androidx.appcompat.app.AppCompatActivity; import androidx.loader.app.LoaderManager; import androidx.loader.content.CursorLoader; import androidx.loader.content.Loader; import androidx.recyclerview.widget.GridLayoutManager; import androidx.recyclerview.widget.RecyclerView; import com.example.imgpicker.Adapter.ImageListAdapter; import com.example.imgpicker.domain.ImageItem; import com.example.imgpicker.utils.PickerConfig; import java.util.ArrayList; import java.util.List; //D/PickerAvtivity: onCreate: ==================================== //D/PickerAvtivity: _id ==== 43 //D/PickerAvtivity: _data ==== /storage/emulated/0/DCIM/Camera/IMG_20200420_064425.jpg //D/PickerAvtivity: _size ==== 197214 //D/PickerAvtivity: _display_name ==== IMG_20200420_064425.jpg //D/PickerAvtivity: mime_type ==== image/jpeg //D/PickerAvtivity: title ==== IMG_20200420_064425 //D/PickerAvtivity: date_added ==== 1587365066 //D/PickerAvtivity: date_modified ==== 1587365066 //D/PickerAvtivity: description ==== null //D/PickerAvtivity: picasa_id ==== null //D/PickerAvtivity: isprivate ==== null //D/PickerAvtivity: latitude ==== 37.422 //D/PickerAvtivity: longitude ==== -122.084 //D/PickerAvtivity: datetaken ==== 1587365065974 //D/PickerAvtivity: orientation ==== 0 //D/PickerAvtivity: mini_thumb_magic ==== null //D/PickerAvtivity: bucket_id ==== -1739773001 //D/PickerAvtivity: bucket_display_name ==== Camera //D/PickerAvtivity: width ==== 960 //D/PickerAvtivity: height ==== 1280 //D/PickerAvtivity: onCreate: ==================================== public class PickerAvtivity extends AppCompatActivity implements ImageListAdapter.OnItemSelectedChangeListener { private static final String TAG = "PickerAvtivity"; public static final int LOADER_ID=1; private List<ImageItem> mImageItem=new ArrayList<>(); ImageListAdapter mImageListAdapter; TextView finishView; PickerConfig picker; ImageView backView; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_picker); // ContentResolver contentResolver=getContentResolver(); // Uri imageUri= MediaStore.Images.Media.EXTERNAL_CONTENT_URI; // Cursor query =contentResolver.query(imageUri,null,null,null,null); // String[] colunmNames=query.getColumnNames(); // while (query.moveToNext()){ // Log.d(TAG, "onCreate: ===================================="); // for (String colunmName : colunmNames) { // Log.d(TAG, colunmName+" ==== "+query.getString(query.getColumnIndex(colunmName))); // } // Log.d(TAG, "onCreate: ===================================="); // } // query.close(); initLoaderManager(); initView(); initEvent(); initConfig(); } private void initConfig() { picker = PickerConfig.getInstance(); int maxSelectedCount= picker.getMaxSelectedCount(); mImageListAdapter.setmMaxSelectedCount(maxSelectedCount); } private void initEvent() { mImageListAdapter.setOnItemSelectedChangeListener(this); finishView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //获取所选择的数据 List<ImageItem> results = mImageListAdapter.getmSelectedItems(); //通知其他地方 PickerConfig.OnImageSelectFinishListener onImageSelectFinishListener = picker.getmImageSelectedFinishListener(); if (onImageSelectFinishListener!=null){ onImageSelectFinishListener.onSelectedFinished(results); } //结束 finish(); } }); backView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } private void initView() { finishView = findViewById(R.id.finish_tv); RecyclerView listView=findViewById(R.id.image_list_view); backView = findViewById(R.id.back_press_iv); listView.setLayoutManager(new GridLayoutManager(this,3)); //设置适配器 mImageListAdapter = new ImageListAdapter(); listView.setAdapter(mImageListAdapter); } private void initLoaderManager() { mImageItem.clear(); LoaderManager loaderManager=LoaderManager.getInstance(this); loaderManager.initLoader(LOADER_ID, null, new LoaderManager.LoaderCallbacks<Cursor>() { @NonNull @Override public Loader<Cursor> onCreateLoader(int id, @Nullable Bundle args) { if(id==LOADER_ID){ return new CursorLoader(PickerAvtivity.this,MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new String[]{"_data","_display_name","date_added","_id","width","height"}, null,null,"date_added DESC"); } return null; } @Override public void onLoadFinished(@NonNull Loader<Cursor> loader, Cursor cursor) { if (cursor!=null){ while (cursor.moveToNext()){ String path=cursor.getString(0); String title=cursor.getString(1); long date=cursor.getLong(2); int id=cursor.getInt(3); int w=cursor.getInt(4); int h=cursor.getInt(5); ImageItem imageItem=new ImageItem(path,title,date,id,w,h); // func(imageItem); mImageItem.add(imageItem); } cursor.close(); for (ImageItem imageItem : mImageItem) { Log.d(TAG, "imageItem ==========> "+imageItem.toString()); } mImageListAdapter.setData(mImageItem); } } @Override public void onLoaderReset(@NonNull Loader<Cursor> loader) { } }); } @Override public void OnItemSelectedChange(List<ImageItem> mSelectedItems) { //所选择的数据发生变化 finishView.setText("("+mSelectedItems.size()+"/"+mImageListAdapter.getmMaxSelectedCount()+")完成"); } public void func(ImageView view) { Bitmap bitmap = BitmapFactory.decodeResource(getResources(),43); int width = bitmap.getWidth(); int height = bitmap.getHeight(); Bitmap base = Bitmap.createBitmap(width, height,bitmap.getConfig()); // Bitmap B=toGrayscale(base); Canvas canvas = new Canvas(base);//以base为模板创建canvas对象 canvas.drawBitmap(bitmap, new Matrix(),new Paint()); for(int i = 0; i < width; i++)//遍历像素点 { for(int j = 0; j < height*0.5; j++) { int color = bitmap.getPixel(i, j); int r = Color.red(color); int g = Color.green(color); int b = Color.blue(color); int a = Color.alpha(color); int avg = (r+g+b)/3;//RGB均值 if(avg >= 150)//100可以理解为经验值 { base.setPixel(i, j,Color.argb(a, 255, 255, 255));//设为白色 } else { base.setPixel(i, j,Color.argb(a, 0, 0, 0));//设为黑色 } } } bitmap.recycle(); view.setImageBitmap(base); } }
四、效果
