我试图从相机和画廊加载图像加载内部tensorflow lite模型。从图库加载图像时,出现以下错误。
2021-01-02 11:48:03.309 9858-9858/com.example.coco_classif E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /storage/emulated/0/Pictures/20200714_135735 (1).jpg: open failed: EACCES (Permission denied)
2021-01-02 11:48:03.332 9858-9858/com.example.coco_classif E/Error log: java.lang.NullPointerException: Cannot load null bitmap.
注意:问题似乎来自try-catch块,从相机加载工作正常
维护
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.coco_classif">
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:roundIcon="@mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="@style/Theme.Coco_classif">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
主要活动
package com.example.coco_classif;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import android.Manifest;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.Image;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
public class MainActivity extends AppCompatActivity {
private static final int CAMERA_PERMISSION_REQUEST_CODE = 1000;
private static final int CAMERA_REQUEST_CODE = 10001;
private ImageView imageView;
private ListView listView;
private ImageClassifier imageClassifier;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
inaializeUIElements();
}
private void inaializeUIElements() {
imageView = findViewById(R.id.iv_capture);
listView = findViewById(R.id.lv_probabilities);
Button takepicture = findViewById(R.id.bt_take_picture);
try {
imageClassifier = new ImageClassifier(this);
} catch (IOException e) {
Log.e("Error While Creating Image Classifier", "Error" +e);
}
takepicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(hasPermission()) {
selectImage();
}else{
requestPermission();
}
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == 1) {
Bitmap photo = (Bitmap) Objects.requireNonNull(Objects.requireNonNull(data).getExtras()).get("data");
imageView.setImageBitmap(photo);
List<ImageClassifier.Recognition> predictions = imageClassifier.recognizeImage(photo, 0);
final List<String> predictionList = new ArrayList<>();
for(ImageClassifier.Recognition recog: predictions){
predictionList.add("Label: " + recog.getName() + "Confidence: " + recog.getConfidance());
}
ArrayAdapter<String> predictionsAdapter = new ArrayAdapter<>(
this,R.layout.support_simple_spinner_dropdown_item,predictionList);
listView.setAdapter(predictionsAdapter);
}
else if (requestCode == 2) {
try {
Uri selectedImage = data.getData();
String[] filePath = new String[]{MediaStore.Images.Media.DATA};
Cursor c = getContentResolver().query(selectedImage,filePath, null, null, null);
c.moveToFirst();
int columnIndex = c.getColumnIndex(filePath[0]);
String picturePath = c.getString(columnIndex);
c.close();
Bitmap thumbnail = (BitmapFactory.decodeFile(picturePath));
Log.w("path of image from gallery......******************.........", picturePath+"");
Toast.makeText(this,picturePath.toString(),Toast.LENGTH_LONG).show();
imageView.setImageBitmap(thumbnail);
List<ImageClassifier.Recognition> predictions = imageClassifier.recognizeImage(thumbnail, 0);
final List<String> predictionList = new ArrayList<>();
for(ImageClassifier.Recognition recog: predictions){
predictionList.add("Label: " + recog.getName() + "Confidence: " + recog.getConfidance());
}
ArrayAdapter<String> predictionsAdapter = new ArrayAdapter<>(
this,R.layout.support_simple_spinner_dropdown_item,predictionList);
listView.setAdapter(predictionsAdapter);
}catch (Exception e){
Toast.makeText(this,e.toString(),Toast.LENGTH_LONG).show();
Log.e("Error log", e.toString());
}
}
}
super.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(hasAllPermissions(grantResults)){
openCamera();
}else {
requestPermission();
}
}
private boolean hasAllPermissions(int[] grantResults) {
for(int result : grantResults){
if (result == PackageManager.PERMISSION_DENIED)
return false;
}
return true;
}
private void requestPermission() {
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
if(shouldShowRequestPermissionRationale(Manifest.permission.CAMERA)){
Toast.makeText(this," Permission required",Toast.LENGTH_SHORT).show();
}
requestPermissions(new String[]{Manifest.permission.CAMERA}, CAMERA_PERMISSION_REQUEST_CODE);
}
}
private void openCamera() {
Intent camerIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(camerIntent,CAMERA_REQUEST_CODE);
}
private boolean hasPermission() {
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M){
return checkSelfPermission(Manifest.permission.CAMERA)== PackageManager.PERMISSION_GRANTED;
}
return true;
}
private void selectImage() {
final CharSequence[] options = {"Take Photo", "Choose from Gallery", "Cancel"};
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Add Photo!");
builder.setItems(options, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
if (options[item].equals("Take Photo")) {
Intent camerIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(camerIntent,1);
} else if (options[item].equals("Choose from Gallery")) {
Intent intent = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 2);
} else if (options[item].equals("Cancel")) {
dialog.dismiss();
}
}
});
builder.show();
}
}
1条答案
按热度按时间vd2z7a6w1#
注意:这个代码片段只适用于编写文本文件,我使用这个方法来解决open failed:eacces(权限被拒绝)
我知道您的实现必须处理图像,这导致了2021-01-02 11:48:03.332 9858-9858/com.example.coco\u classif e/error log:java.lang.nullpointerexception:无法加载空位图。
另外,在android上检查这个异常“openfailed:eacces(permission denied)”
我遇到了完全相同的问题,我所做的只是创建一个目录并在其中编写一个文本文件。
另外,以编程方式为图像创建新文件名是一种很好的做法,使用日期格式化程序。
我可以看到您正在使用警报对话框来选择图像,我建议您不要这样做,警报对话框会导致很多同步问题。
这段代码在androidqone+6t上进行了测试,没有任何错误。
检查您的权限:旧的存储权限在android r上不起作用。