求助：Ion-Input type="file"在Android 6.0.1设备上无法正常工作

Hey there! Let's figure out why your file input isn't working on Android 6.0.1—even with storage permissions enabled, there are a few common gotchas here:

• Ionic's ion-input wrapper might be blocking the native trigger
  The <ion-input> component adds its own layer of abstraction over the native HTML input. On older Android versions like 6.0.1, this wrapper sometimes fails to properly propagate the click event to the underlying file input. Try swapping it for a plain native <input> to test:

  <input type="file" accept=".csv, .txt" (change)="readFile($event)">
  

  If this fixes the issue, you can either style the native input to match your app or use Ionic's native file picker plugins (like FileChooser) as a more reliable alternative.

• Outdated System WebView
  Android 6.0.1's default System WebView is pretty old and has known gaps in HTML5 file input support. Check if the device has an available WebView update: go to Settings > Apps > Android System WebView and see if an update is waiting. If updating isn't possible, using native plugins instead of the HTML file input will bypass the WebView entirely.

• Missing permission declarations in AndroidManifest.xml
  Even if you've enabled runtime storage permissions, make sure your AndroidManifest.xml explicitly declares the required permissions:

  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  

  For Android 6+, runtime permissions are mandatory, but the manifest still needs to list them first. Double-check that your code is requesting these permissions before triggering the file picker too.

• Ionic version compatibility bugs
  If you're using an older Ionic version (like 3.x or earlier), there were known issues with file inputs on Android 6. Look up your version's release notes to see if there's a patch available, or consider upgrading to a newer, more stable version if feasible.

• Focus handling quirks
  The screen jump you're seeing points to a focus-related bug where the ion-input isn't properly triggering the click event. Try wrapping the input in a div and manually triggering the click to bypass focus issues:

  <div (click)="openFilePicker()">
    <input #fileInput type="file" accept=".csv, .txt" (change)="readFile($event)" style="display: none;">
    Tap to select file
  </div>
  

  Then in your component:

  import { ViewChild, ElementRef } from '@angular/core';
  
  // ...
  
  @ViewChild('fileInput') fileInput: ElementRef;
  
  openFilePicker() {
    this.fileInput.nativeElement.click();
  }
  

  This directly triggers the native file picker without relying on ion-input's event handling.

内容的提问来源于stack exchange，提问作者Amos