討論區列表 >> Android APP 開發 >> InputStream 讀取 imageview
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樓主 小焰 
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請問下面我用紅色字體的地方，要如何讓他可以讀取到imageview的圖片? [/code] package com.example.takming.ocr; import android.Manifest; import android.app.Activity; import android.content.ContentValues; import android.content.Intent; import android.content.pm.ActivityInfo; import android.content.pm.PackageManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.net.Uri; import android.os.AsyncTask; import android.provider.MediaStore; import android.support.v4.app.ActivityCompat; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.ImageView; import android.widget.Toast; import com.google.api.client.extensions.android.json.AndroidJsonFactory; import com.google.api.client.http.javanet.NetHttpTransport; import com.google.api.services.vision.v1.Vision; import com.google.api.services.vision.v1.VisionRequestInitializer; import com.google.api.services.vision.v1.model.AnnotateImageRequest; import com.google.api.services.vision.v1.model.BatchAnnotateImagesRequest; import com.google.api.services.vision.v1.model.BatchAnnotateImagesResponse; import com.google.api.services.vision.v1.model.Feature; import com.google.api.services.vision.v1.model.Image; import com.google.api.services.vision.v1.model.TextAnnotation; import org.apache.commons.io.IOUtils; import java.io.IOException; import java.io.InputStream; import java.util.Arrays; public class MainActivity extends AppCompatActivity { Uri imgUri; //用來參照拍照存檔的 Uri 物件 ImageView imv; //用來參照 ImageView 物件 private Vision vision; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_NOSENSOR);//設定螢幕不隨手機旋轉 setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);//設定螢幕直向顯示 imv = (ImageView)findViewById(R.id.imageView); //參照 Layout 中的 ImageView 元件 Vision.Builder visionBuilder = new Vision.Builder(new NetHttpTransport(), new AndroidJsonFactory(), null); //建立google cloud vision api visionBuilder.setVisionRequestInitializer( new VisionRequestInitializer("AIzaSyASDSDVcb3Y9812_rxYwapLYMQpu_eXjEM")); //google cloud vision api key vision = visionBuilder.build(); textocr(); } public void onGet(View v) { if (ActivityCompat.checkSelfPermission(this, //檢查是否已取得寫入權限 Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) { //尚未取得權限 ActivityCompat.requestPermissions(this, //向使用者要求允許寫入權限 new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 200); } else { //已經取得權限 savePhoto(); //拍照並存檔 } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { if (requestCode == 200){ if (grantResults[0] == PackageManager.PERMISSION_GRANTED){ //使用者允許權限 savePhoto(); //拍照並存檔 } else { //使用者拒絕權限 Toast.makeText(this, "程式需要寫入權限才能運作", Toast.LENGTH_SHORT).show(); } } } private void savePhoto () { imgUri = getContentResolver().insert( MediaStore.Images.Media.EXTERNAL_CONTENT_URI, new ContentValues()); Intent it = new Intent("android.media.action.IMAGE_CAPTURE"); it.putExtra(MediaStore.EXTRA_OUTPUT, imgUri); //將 uri 加到拍照 Intent 的額外資料中 startActivityForResult(it, 100); } public void onPick(View v) { Intent it = new Intent(Intent.ACTION_GET_CONTENT); //動作設為 "選取內容" it.setType("image/*"); //設定要選取的媒體類型為：所有類型的圖片 startActivityForResult(it, 101); //啟動意圖, 並要求傳回選取的圖檔 } protected void onActivityResult (int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(resultCode == Activity.RESULT_OK) { //要求的意圖成功了 switch(requestCode) { case 100: //拍照 Intent it = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, imgUri);//設為系統共享媒體檔 sendBroadcast(it); break; case 101: //選取相片 imgUri = data.getData(); //取得選取相片的 Uri break; } showImg(); //顯示 imgUri 所指明的相片 } else { Toast.makeText(this, requestCode==100? "沒有拍到照片": "沒有選取相片", Toast.LENGTH_LONG) .show(); } } void showImg() { int iw, ih, vw, vh; boolean needRotate; //用來儲存是否需要旋轉 BitmapFactory.Options option = new BitmapFactory.Options(); //建立選項物件 option.inJustDecodeBounds = true; //設定選項：只讀取圖檔資訊而不載入圖檔 //讀取圖檔資訊存入 Option 中 try { BitmapFactory.decodeStream(getContentResolver().openInputStream(imgUri), null, option); } catch (IOException e) { Toast.makeText(this, "讀取照片資訊時發生錯誤", Toast.LENGTH_LONG).show(); return; } iw = option.outWidth; //由 option 中讀出圖檔寬度 ih = option.outHeight; //由 option 中讀出圖檔高度 vw = imv.getWidth(); //取得 ImageView 的寬度 vh = imv.getHeight(); //取得 ImageView 的高度 int scaleFactor; if(iw<ih) { //如果圖片的寬度小於高度 needRotate = false; //不需要旋轉 scaleFactor = Math.min(iw/vw, ih/vh); // 計算縮小比率 } else { needRotate = true; //需要旋轉 scaleFactor = Math.min(iw/vh, ih/vw); // 將 ImageView 的寬、高互換來計算縮小比率 } option.inJustDecodeBounds = false; //關閉只載入圖檔資訊的選項 option.inSampleSize = scaleFactor; //設定縮小比例, 例如 2 則長寬都將縮小為原來的 1/2 //載入圖檔 Bitmap bmp = null; try { bmp = BitmapFactory.decodeStream(getContentResolver().openInputStream(imgUri), null, option); } catch (IOException e) { Toast.makeText(this, "無法取得照片", Toast.LENGTH_LONG).show(); } if(needRotate) { //如果需要旋轉 Matrix matrix = new Matrix(); //建立 Matrix 物件 matrix.postRotate(90); //設定旋轉角度 bmp = Bitmap.createBitmap(bmp , //用原來的 Bitmap 產生一個新的 Bitmap 0, 0, bmp.getWidth(), bmp.getHeight(), matrix, true); } imv.setImageBitmap(bmp); //顯示圖片 } private void textocr() { AsyncTask.execute(new Runnable() { @Override public void run() { try { InputStream inputStream = getFileStreamPath(); byte[] photoData = IOUtils.toByteArray(inputStream); Image inputImage = new Image(); inputImage.encodeContent(photoData); Feature desiredFeature = new Feature(); //發出OCR請求 desiredFeature.setType("TEXT_DETECTION"); //TEXT_DETECTION為辨識少量文字api AnnotateImageRequest request = new AnnotateImageRequest(); request.setImage(inputImage); request.setFeatures(Arrays.asList(desiredFeature)); BatchAnnotateImagesRequest batchRequest = new BatchAnnotateImagesRequest(); batchRequest.setRequests(Arrays.asList(request)); BatchAnnotateImagesResponse batchResponse = vision.images().annotate(batchRequest).execute(); final TextAnnotation text = batchResponse.getResponses() .get(0).getFullTextAnnotation(); runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(getApplicationContext(), text.getText(), Toast.LENGTH_LONG).show(); } }); } catch(Exception e) { Log.d("ERROR", e.getMessage()); } } }); } } [code]
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本篇文章發表於2018-10-08 00:24 |
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