图片压缩
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需要依赖的
glide Rxjava retrofit
compile 'com.squareup.retrofit2:retrofit:2.2.0'compile 'com.squareup.retrofit2:converter-gson:2.2.0'compile 'io.reactivex.rxjava2:rxjava:2.1.3'compile 'io.reactivex.rxjava2:rxandroid:2.0.1'implementation project(':library-demonstrate')compile 'jp.wasabeef:glide-transformations:3.0.1'
接口
public interface NetServerInterface { @GET Call<ResponseBody> getBitmap(@Url String url);}
/*1,质量压缩法 1.1质量压缩不会减少图片的像素 1.2在像素不变的前提下改变图片的位深及透明度等，来达到压缩图片的目的。 1.3压缩的图片文件大小会有改变，但是导入成bitmap后占得内存是不变的2,采样率压缩法 2.1内存的使用少,不会过多的占用内存 2.2可以先只读取图片的边，通过宽和高设定好取样率后再加载图片 2.33,缩放法 3.1通过缩放图片像素来减少图片占用内存大小 */public class MainActivity extends AppCompatActivity implements View.OnClickListener { private static final String IMG_URL_0 = "http://pic.xiami.net/images/artistlogo/77/14677816895777.jpg"; protected TextView tvOld; protected TextView tv3; private String baseUrl = "http://pic.xiami.net"; private int contentLength; private String IMG_URL_1 = "http://pic9.nipic.com/20100823/4361515_000842599423_2.jpg"; private String filePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/bitmaps/"; private void showList() { DialogUtil.showListDialog(this, "Android中图片压缩方案", new String[]{ "0,加载原图", "1,下载原图", "2,质量压缩法,不压缩保存到本地", "3,质量压缩法,质量压缩保存到本地", "4,采样率压缩法,保存", "5,缩放法,方式一!", "6,缩放法,方式二!", }, new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { switch (which) { case 0: //加载原图,并且展示! load0(); break; case 1: //下载原图,并且保存本地,从本加载展示! load1(); break; case 2: // load2(); break; case 3: load3(); break; case 4: load4(); break; case 5: load5(); break; case 6: load6(); break; } } }); } private void load6() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); Bitmap image = BitmapFactory.decodeStream(stream); ByteArrayOutputStream out = new ByteArrayOutputStream(); image.compress(Bitmap.CompressFormat.JPEG, 85, out); int size = contentLength; //--原大小/内存小小后,开平方根. float zoom = (float)Math.sqrt(size * 1024 / (float)out.toByteArray().length);// Matrix matrix = new Matrix(); matrix.setScale(zoom, zoom); Bitmap result = Bitmap.createBitmap(image, 0, 0, image.getWidth(), image.getHeight(), matrix, true); //清空. out.reset(); result.compress(Bitmap.CompressFormat.JPEG, 85, out); while(out.toByteArray().length > size * 1024){ DemonstrateUtil.showLogResult(out.toByteArray().length+"***"); matrix.setScale(0.9f, 0.9f); result = Bitmap.createBitmap(result, 0, 0, result.getWidth(), result.getHeight(), matrix, true); out.reset(); result.compress(Bitmap.CompressFormat.JPEG, 85, out); } File file = new File(Environment.getExternalStorageDirectory(), "load6.jpg"); FileOutputStream fos = new FileOutputStream(file); fos.write(out.toByteArray()); fos.flush(); fos.close(); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); Bitmap bitmap = BitmapFactory.decodeFile(path); int byteCount = bitmap.getByteCount() / 1024; tv3.setText("加载到内存的大小:" + byteCount); iv.setImageBitmap(bitmap); } }); } private void load5() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); Bitmap bmp = BitmapFactory.decodeStream(stream); // 尺寸压缩倍数,值越大，图片尺寸越小 int ratio = 2; // 压缩Bitmap到对应尺寸 Bitmap result = Bitmap.createBitmap(bmp.getWidth() / ratio, bmp.getHeight() / ratio, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(result); Rect rect = new Rect(0, 0, bmp.getWidth() / ratio, bmp.getHeight() / ratio); canvas.drawBitmap(bmp, null, rect, null); ByteArrayOutputStream baos = new ByteArrayOutputStream(); // 把压缩后的数据存放到baos中 result.compress(Bitmap.CompressFormat.JPEG, 100, baos); File file = new File(Environment.getExternalStorageDirectory(), "load5.jpg"); FileOutputStream fos = new FileOutputStream(file); fos.write(baos.toByteArray()); fos.flush(); fos.close(); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); Bitmap bitmap = BitmapFactory.decodeFile(path); int byteCount = bitmap.getByteCount() / 1024; tv3.setText("加载到内存的大小:" + byteCount); iv.setImageBitmap(bitmap); } }); } private void load4() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); File file = new File(Environment.getExternalStorageDirectory(), "load4.jpg"); FileOutputStream out = new FileOutputStream(file); out.write(body.bytes()); out.close(); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); BitmapFactory.Options newOpts = new BitmapFactory.Options(); //开始读入图片，此时把options.inJustDecodeBounds 设回true了 newOpts.inJustDecodeBounds = true; //此时返回bm为空 Bitmap bitmap = BitmapFactory.decodeFile(path, newOpts); newOpts.inJustDecodeBounds = false; int w = newOpts.outWidth; int h = newOpts.outHeight; //现在主流手机比较多是1280*720分辨率，所以高和宽我们设置为 //这里设置高度为1280f float hh = 1280f; //这里设置宽度为720f float ww = 720f; //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可 //be=1表示不缩放 int be = 1; if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放 be = (int) (newOpts.outWidth / ww); } else if (w < h && h > hh) {//如果高度高的话根据高度固定大小缩放 be = (int) (newOpts.outHeight / hh); } if (be <= 0) { be = 1; } //设置缩放比例 newOpts.inSampleSize = be; //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了 bitmap = BitmapFactory.decodeFile(path, newOpts); //压缩好比例大小后再进行质量压缩 ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length / 1024 > 100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩 //重置baos即清空baos baos.reset(); //这里压缩options%，把压缩后的数据存放到baos中 bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos); options -= 10;//每次都减少10 } int len = baos.toByteArray().length / 1024; tv3.setText("内存中的大小:" + len + "kb"); //把压缩后的数据baos存放到ByteArrayInputStream中 ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); //把ByteArrayInputStream数据生成图片 Bitmap bitmap3 = BitmapFactory.decodeStream(isBm, null, null); iv.setImageBitmap(bitmap3); /*File file5 = new File(Environment.getExternalStorageDirectory(), "load5.jpg"); FileOutputStream out = new FileOutputStream(file5); out.write(baos.toByteArray()); out.close(); baos.close();*/ } }); } private void load3() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); Bitmap bitmap = BitmapFactory.decodeStream(stream); ByteArrayOutputStream baos = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 int options = 100; while (baos.toByteArray().length / 1024 > 100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩 //重置baos即清空baos baos.reset(); //这里压缩options%，把压缩后的数据存放到baos中 bitmap.compress(Bitmap.CompressFormat.JPEG, options, baos); options -= 10;//每次都减少10 } File file = new File(Environment.getExternalStorageDirectory(), "load3.jpg"); FileOutputStream out = new FileOutputStream(file); out.write(baos.toByteArray()); out.close(); baos.close(); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); Bitmap bitmap = BitmapFactory.decodeFile(path); int byteCount = bitmap.getByteCount() / 1024; tv3.setText("加载到内存的大小:" + byteCount); iv.setImageBitmap(bitmap); } }); } private void load2() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); //压缩100,图片并将Bitmap保存到本地 Bitmap bitmap = BitmapFactory.decodeStream(stream); File file = new File(Environment.getExternalStorageDirectory(), "load2.jpg"); FileOutputStream out = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); Bitmap bitmap = BitmapFactory.decodeFile(path); int byteCount = bitmap.getByteCount() / 1024; tv3.setText("加载到内存的大小:" + byteCount); iv.setImageBitmap(bitmap); } }); } private void load1() { Observable.create(new ObservableOnSubscribe<String>() { @Override public void subscribe(ObservableEmitter<String> e) throws Exception { ResponseBody body = new Retrofit.Builder() .baseUrl(baseUrl) .build() .create(NetServerInterface.class) .getBitmap(IMG_URL_1) .execute() .body(); contentLength = (int) body.contentLength() / 1024; InputStream stream = body .byteStream(); //压缩图片并将Bitmap保存到本地// Bitmap bitmap = BitmapFactory.decodeStream(stream);// bitmap.compress(Bitmap.CompressFormat.JPEG, 100, out); File file = new File(Environment.getExternalStorageDirectory(), "load1.jpg"); FileOutputStream out = new FileOutputStream(file); out.write(body.bytes()); out.close(); String filePath = file.getPath(); e.onNext(filePath); } }) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<String>() { @Override public void accept(String path) throws Exception { tvOld.setText("原始大小:" + contentLength + "kb"); File file = new File(path); int fileLenth = (int) (file.length() / 1024); tv.setText("保存后大小:" + fileLenth + "kb"); Bitmap bitmap = BitmapFactory.decodeFile(path); int byteCount = bitmap.getByteCount() / 1024; tv3.setText("加载到内存的大小:" + byteCount); iv.setImageBitmap(bitmap); } }); } private void load0() { Observable .create(new ObservableOnSubscribe<Bitmap>() { @Override //订阅 public void subscribe(ObservableEmitter<Bitmap> e) throws Exception { Response<ResponseBody> response = new Retrofit.Builder() .baseUrl(baseUrl)//地址 .build() .create(NetServerInterface.class)//运行接口 .getBitmap(IMG_URL_0) .execute();//异步线程 contentLength = (int) (response.body().contentLength() / 1024); //IO读取流 InputStream stream = response.body().byteStream(); //位图 Bitmap bitmap = BitmapFactory.decodeStream(stream); e.onNext(bitmap); } }).subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(new Consumer<Bitmap>() { @Override public void accept(Bitmap bitmap) throws Exception { tvOld.setText("原图片大小为:" + contentLength + "kb"); iv.setImageBitmap(bitmap); } }); } protected Button btn; protected TextView tv; protected ImageView iv; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); super.setContentView(R.layout.activity_main); initView(); } @Override public void onClick(View view) { if (view.getId() == R.id.btn) { showList(); } } private void initView() { btn = (Button) findViewById(R.id.btn); btn.setOnClickListener(MainActivity.this); tv = (TextView) findViewById(R.id.tv); iv = (ImageView) findViewById(R.id.iv); tvOld = (TextView) findViewById(R.id.tv_old); tv3 = (TextView) findViewById(R.id.tv3); }}
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