android - webview 应用程序:选择文件不起作用
问题描述
我正在设置我的 webview 应用程序,我希望“选择文件”按钮能够从我的手机上传图片,但现在该按钮没有任何功能或不起作用。如果有人可以帮助我,请提前谢谢!
这是来自 MainActivity
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webview);
webView.setWebViewClient(new WebViewClient());
webView.loadUrl("https://example.com");
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
}
@Override
public void onBackPressed() {
if (webView.canGoBack()) {
webView.goBack();
} else {
super.onBackPressed();
}
}
}
这是来自 AndroidManifest:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<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/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
解决方案
请遵循以下规定的代码:
public class MainActivity extends Activity {
private WebView webView;
private String urlStart = "http://www.example.com/mobile/";
private static final int FILECHOOSER_RESULTCODE = 2888;
private ValueCallback<Uri> mUploadMessage;
//Camera parameters
private Uri mCapturedImageURI = null;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.getSettings().setAllowFileAccess(true);
webView.loadUrl(urlStart);
webView.setWebChromeClient(new WebChromeClient() {
// openFileChooser for Android 3.0+
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
mUploadMessage = uploadMsg;
try{
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File externalDataDir = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_DCIM);
File cameraDataDir = new File(externalDataDir.getAbsolutePath() +
File.separator + "browser-photos");
cameraDataDir.mkdirs();
String mCameraFilePath = cameraDataDir.getAbsolutePath() + File.separator +
System.currentTimeMillis() + ".jpg";
mCapturedImageURI = Uri.fromFile(new File(mCameraFilePath));
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, new Parcelable[] { cameraIntent });
startActivityForResult(chooserIntent, FILECHOOSER_RESULTCODE);
}
catch(Exception e){
Toast.makeText(getBaseContext(), "Camera Exception:"+e, Toast.LENGTH_LONG).show();
}
}
// For Android < 3.0
@SuppressWarnings("unused")
public void openFileChooser(ValueCallback<Uri> uploadMsg ) {
openFileChooser(uploadMsg, "");
}
// For Android > 4.1.1
@SuppressWarnings("unused")
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType, String capture){
openFileChooser(uploadMsg, acceptType);
}
public boolean onConsoleMessage(ConsoleMessage cm) {
onConsoleMessage(cm.message(), cm.lineNumber(), cm.sourceId());
return true;
}
public void onConsoleMessage(String message, int lineNumber, String sourceID)
{
Log.d("androidruntime", "www.example.com: " + message);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
// TODO Auto-generated method stub
if(requestCode==FILECHOOSER_RESULTCODE){
if (null == this.mUploadMessage) {
return;
}
Uri result=null;
try{
if (resultCode != RESULT_OK) {
result = null;
} else {
// retrieve from the private variable if the intent is null
result = intent == null ? mCapturedImageURI : intent.getData();
}
} catch(Exception e) {
Toast.makeText(getApplicationContext(), "activity :"+e, Toast.LENGTH_LONG).show();
}
mUploadMessage.onReceiveValue(result);
mUploadMessage = null;
}
}
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