Android：使用从URI路径检索的文件返回FileNotFound异常？[副本]

Question

apply plugin: 'com.android.application'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.changingimageviewwidth"
        minSdkVersion 26
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'

    implementation "org.apache.sanselan:sanselan:0.97-incubator"
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#ffffff"
    android:orientation="vertical">

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Button"
        android:onClick="analyzePhoto"/>

</LinearLayout>

mainactivity.java：

package com.example.changingimageviewwidth;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;

import org.apache.sanselan.ImageInfo;
import org.apache.sanselan.Sanselan;

import java.io.File;

public class MainActivity extends AppCompatActivity {
    // Request code used when reading in a file
    private Integer READ_IN_FILE = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void analyzePhoto(View v) {
        // Specify that only photos are allowed as inputs (.jpg, .png).
        Intent photoInputSpecs = new Intent(Intent.ACTION_GET_CONTENT);
        photoInputSpecs.setType("image/*");

        Intent photoInputHandler = Intent.createChooser(photoInputSpecs, "Choose a file");
        startActivityForResult(photoInputHandler, 0);
    }

    // Processes the results of Activities.
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        try {
            // Processes the photos that the user selected
            if (requestCode == READ_IN_FILE) {
                System.out.println("Let us process the photos that the user selected.");
                // Retrieve the photo's location
                Uri photoUri = data.getData();
                String photoPath = photoUri.getPath();
                File photoFile = new File(photoPath);

                ImageInfo image1Info = Sanselan.getImageInfo(photoFile);

                int image1HorizontalDPI = image1Info.getPhysicalWidthDpi();
                int image1VerticalDPI = image1Info.getPhysicalHeightDpi();

                System.out.println("[image1HorizontalDPI] = " + image1HorizontalDPI);
                System.out.println("[image1VerticalDPI] = " + image1VerticalDPI);
            }
        }
        catch (Exception ex) {
            System.out.println("onActivityResult error: " + ex.toString());
        }
    }
}

Answer 1

您可以使用下面的类从URI获取实际路径

https://raw.githubusercontent.com/abcoderz/externalfiles/main/realpathfromuri.java

使用上面的链接下载RealPathFromURI，并像下面这样更改代码