[英]Android openFileChooser onCreate() called after onActivityResult()
我有一個webview,在其中一個頁面上有一個Upload Photo按鈕。 我找到了一些實現文件選擇器的代碼(Android,為什么這么難???),如果我選擇圖庫,一切正常。 如果我選擇10倍的相機1,它將起作用。 但是大多數情況下,當我拍照並單擊“保存”(這全部在相機活動中)時,Web視圖會加載啟動應用程序時加載的第一頁。 似乎沒有調用onActivityResult()
,而是調用了onCreate()
,這使我的應用程序混亂。 能給我一個例子,說明我拍照后如何還原webView狀態嗎? (也許我應該提到我已經在WebView中登錄了)。
這是WebChromeClient類:
public class WebViewChromeClient extends WebChromeClient {
private Activity activity;
public Uri imageUri;
private static final int FILECHOOSER_RESULTCODE = 1;
private Uri mCapturedImageURI = null;
private Context context;
private MainActivity mainActivity;
public WebViewChromeClient(Context context, Activity activity,
MainActivity mainActivity) {
this.activity = activity;
this.context = context;
this.mainActivity = mainActivity;
}
public void openFileChooser(ValueCallback<Uri> uploadMsg, String acceptType) {
// Update message
((Audi) activity.getApplication()).setmUploadMessage(uploadMsg);
if (uploadMsg == null) {
Log.d("UPLOAD MESSAGE", "NULL");
}
try {
File imageStorageDir = new File(
Environment
.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
"AndroidExampleFolder");
if (!imageStorageDir.exists()) {
// Create AndroidExampleFolder at sdcard
imageStorageDir.mkdirs();
}
// Create camera captured image file path and name
File file = new File(imageStorageDir + File.separator + "IMG_"
+ String.valueOf(System.currentTimeMillis()) + ".jpg");
mCapturedImageURI = Uri.fromFile(file);
mainActivity.setmCapturedImageURI(mCapturedImageURI);
Log.d("Line", "57");
// Camera capture image intent
final Intent captureIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
captureIntent.putExtra(MediaStore.EXTRA_OUTPUT, mCapturedImageURI);
mainActivity.setmCapturedImageURI(mCapturedImageURI);
Intent i = new Intent(Intent.ACTION_GET_CONTENT);
i.addCategory(Intent.CATEGORY_OPENABLE);
i.setType("image/*");
// Create file chooser intent
Intent chooserIntent = Intent.createChooser(i, "Image Chooser");
// Set camera intent to file chooser
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS,
new Parcelable[] { captureIntent });
// On select image call onActivityResult method of activity
activity.startActivityForResult(chooserIntent,
FILECHOOSER_RESULTCODE);
} catch (Exception e) {
Toast.makeText(context, "Exception:" + e, Toast.LENGTH_LONG).show();
}
}
// openFileChooser for Android < 3.0
public void openFileChooser(ValueCallback<Uri> uploadMsg) {
openFileChooser(uploadMsg, "");
}
// openFileChooser for other Android versions
public void openFileChooser(ValueCallback<Uri> uploadMsg,
String acceptType, String capture) {
openFileChooser(uploadMsg, acceptType);
}
// The webPage has 2 filechoosers and will send a
// console message informing what action to perform,android wml_siso init
// taking a photo or updating the file
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", "Show console messages, Used for debugging: "
+ message);
}
}
這是onActivityResult方法:
@Override
protected void onActivityResult(int requestCode, int resultCode,
Intent intent) {
webView.requestFocus();
if (requestCode == FILECHOOSER_RESULTCODE) {
Log.d("MainActivity", "onActivityResult");
if (null == ((Audi) getApplication()).getmUploadMessage()) {
Log.d("FileChooser Result", "58");
return;
}
Log.d("MainActivity", "onActivityResult");
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();
}
((Audi) getApplication()).getmUploadMessage().onReceiveValue(result);
((Audi) getApplication()).setmUploadMessage(null);
}
Log.d("MainActivity", "onActivityResult");
}
運行文件選擇器時,系統可能正在暫停/停止您的活動。
您需要處理onResume()
並還原活動的先前狀態。 當您的活動重新啟動時,將調用onResume
方法,因此這是在啟動文件選擇器之前重新加載所顯示的任何WebView的好地方。
通過在清單android:configChanges="keyboardHidden|orientation|screenSize"
添加此行來android:configChanges="keyboardHidden|orientation|screenSize"
查看您發布的代碼,這是一條危險的線:
webView.requestFocus();
首先在onActivityResult()
。 如果正在重新創建MainActivity ,則可能導致NullPointerException 。 系統將無縫地重新啟動您的應用程序,可能會產生報告的行為。
在onActivityResult()
的開頭添加另一個Log.d(),在該危險行周圍進行嘗試/捕獲, 並使用onSaveInstanceState()和onRestoreInstanceState()。
請注意,如果您的MainActivity是Portrait,則您會面臨額外的麻煩,因為Camera應用會強制使用Landscape。
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