出现错误“您的浏览器不允许读取本地文件”是因为WebView默认不允许读取本地文件。您可以通过以下代码示例解决这个问题:
import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
public class MainActivity extends AppCompatActivity {
private static final int PERMISSION_REQUEST_CODE = 1;
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = findViewById(R.id.webview);
// 检查读取文件权限
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
} else {
loadWebView();
}
} else {
loadWebView();
}
}
private void loadWebView() {
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setAllowFileAccess(true);
// 加载本地HTML文件
webView.loadUrl("file:///android_asset/index.html");
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == PERMISSION_REQUEST_CODE) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
loadWebView();
} else {
Toast.makeText(MainActivity.this, "权限被拒绝!", Toast.LENGTH_SHORT).show();
}
}
}
}
通过以上代码示例,您可以在Android Studio中使用WebView将HTML5 Webapp转为APK,并解决“您的浏览器不允许读取本地文件”的错误。