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我被困在我的項目中並請求您的幫助!
我正嘗試在MainActivity.java中的webview中調用一個Activity(BarcodeScannerActivity.java),並使用javascript調用按鈕單擊。我想我搞砸了參數...我不知道我犯了什麼錯誤,我只是複製並修改了博客和計算器中的代碼。使用@JavascriptInterface從webview中調用活動
我有在我的Android工作室logcat的這個錯誤:
[INFO:CONSOLE(315)] "Uncaught Error: Error calling method on NPObject.", source: http:// .........
,這是我的服務器端HTML:
<input type="button" value="Scanner" id="BtnScan" class="btn_dark" onclick="callActivity();" />
<script>
function callActivity() {
Android.openBarcodeScanner();
}
</script>
這是我MainActivity.java包含的WebView:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
//getWindow().requestFeature(Window.FEATURE_ACTION_BAR);
//getActionBar().hide();
setContentView(R.layout.activity_main);
MainWebView = (WebView) findViewById(R.id.mainWebview);
MainWebView.setWebViewClient(new WebViewClient());
//-- add javascript listener
MainWebView.addJavascriptInterface(new WebAppInterface(this), "Android");
MainWebView.getSettings().setJavaScriptEnabled(true);
MainWebView.loadUrl(WebViewURL);
}
..skipped for brevity..
public class WebAppInterface {
Context mContext;
/** Instantiate the interface and set the context */
WebAppInterface(Context c) {
mContext = c;
}
@JavascriptInterface
public void openBarcodeScanner(String str) {
Intent barcodeScanIntent = new Intent(mContext, BarcodeScannerActivity.class);
mContext.startActivity(barcodeScanIntent);
}
}
and last,the BarcodeScannerActivity.java tha噸想被稱爲:
public class BarcodeScannerActivity extends Activity implements View.OnClickListener {
// private static final R = ;
// use a compound button so either checkbox or switch widgets work.
private CompoundButton autoFocus;
private CompoundButton useFlash;
private TextView statusMessage;
private TextView barcodeValue;
private static final int RC_BARCODE_CAPTURE = 9001;
private static final String TAG = "BarcodeMain";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.barcode_scanner);
statusMessage = (TextView)findViewById(R.id.status_message);
barcodeValue = (TextView)findViewById(R.id.barcode_value);
autoFocus = (CompoundButton) findViewById(R.id.auto_focus);
useFlash = (CompoundButton) findViewById(R.id.use_flash);
findViewById(R.id.read_barcode).setOnClickListener(this);
}
/**
* Called when a view has been clicked.
*
* @param v The view that was clicked.
*/
@Override
public void onClick(View v) {
if (v.getId() == R.id.read_barcode) {
// launch barcode activity.
Intent intent = new Intent(this, BarcodeCaptureActivity.class);
intent.putExtra(BarcodeCaptureActivity.AutoFocus, autoFocus.isChecked());
intent.putExtra(BarcodeCaptureActivity.UseFlash, useFlash.isChecked());
startActivityForResult(intent, RC_BARCODE_CAPTURE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == RC_BARCODE_CAPTURE) {
if (resultCode == CommonStatusCodes.SUCCESS) {
if (data != null) {
Barcode barcode = data.getParcelableExtra(BarcodeCaptureActivity.BarcodeObject);
statusMessage.setText(R.string.barcode_success);
barcodeValue.setText(barcode.displayValue);
Log.d(TAG, "Barcode read: " + barcode.displayValue);
} else {
statusMessage.setText(R.string.barcode_failure);
Log.d(TAG, "No barcode captured, intent data is null");
}
} else {
statusMessage.setText(String.format(getString(R.string.barcode_error),
CommonStatusCodes.getStatusCodeString(resultCode)));
}
}
else {
super.onActivityResult(requestCode, resultCode, data);
}
}
}
和最後一個問題是,這個JavaScript代碼也會在我的情況下工作嗎? 還是我需要修改一下?
function callActivity(){
if(window.android){
console.info("android");
window.android.openBarcodeScanner(number.value);
}
else{
console.info("web");
document.form.submit();
}
}
}
非常感謝您的提前!
感謝您的評論@Doug!我想將掃描的條形碼數據(例如:078742353098)傳遞給客戶端的按鈕。我應該在括號之間寫什麼參數?它是Android.openBarcodeScanner(barcode.displayValue); ? –
無論你想從JavaScript端發送到Java端的字符串,當然。無論如何,您的調用應該與參數的類型和數量的定義相匹配。 –