链接到另一个页面时，Android应用程序崩溃
每次我单击创建的按钮转到下一个活动时，应用程序都会崩溃。
这是我使用的代码：
public void openPictureCaptures(View view) {
Intent intent = new Intent(this, EventActivity.class);
this.startActivity ( intent );
}
我链接到的活动（ EventActivity.class ）：
public class EventActivity extends Activity {
//public static final String KEY_MENU_TYPE = "menutype";
Button CaptureImageFromCamera,UploadImageToServer;
ImageView ImageViewHolder;
EditText imageName;
EditText detailText;
ProgressDialog progressDialog ;
Intent intent ;
public static final int RequestPermissionCode = 1 ;
Bitmap bitmap;
boolean check = true;
String GetImageNameFromEditText;
String GetImageDescFromEditText;
String ImageNameFieldOnServer = "event" ;
String ImageDescOnServer = "description";
String ImagePathFieldOnServer = "image" ;
//String menutype = "";
String ImageUploadPathOnSever ="http://getme.com/osunelection/capture_img_upload_to_server.php" ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_event);
CaptureImageFromCamera = (Button)findViewById(R.id.button);
ImageViewHolder = (ImageView)findViewById(R.id.imageView);
UploadImageToServer = (Button) findViewById(R.id.button2);
imageName = (EditText)findViewById(R.id.editText);
detailText = (EditText) findViewById(R.id.detailText);
EnableRuntimePermissionToAccessCamera();
CaptureImageFromCamera.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 7);
}
});
UploadImageToServer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
GetImageNameFromEditText = imageName.getText().toString();
GetImageDescFromEditText = detailText.getText().toString();
ImageUploadToServerFunction();
}
});
/* this.menutype = intent.getStringExtra(KEY_MENU_TYPE);
if (this.menutype == null) {
this.menutype = "";
}*/
}
// Star activity for result method to Set captured image on image view after click.
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 7 && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri uri = data.getData();
try {
// Adding captured image in bitmap.
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
// adding captured image in imageview.
ImageViewHolder.setImageBitmap(bitmap);
} catch (IOException e) {
e.printStackTrace();
}
}
}
// Requesting runtime permission to access camera.
public void EnableRuntimePermissionToAccessCamera(){
if (ActivityCompat.shouldShowRequestPermissionRationale(EventActivity.this,
Manifest.permission.CAMERA))
{
// Printing toast message after enabling runtime permission.
Toast.makeText(EventActivity.this,"CAMERA permission allows us to Access CAMERA app", Toast.LENGTH_LONG).show();
} else {
ActivityCompat.requestPermissions(EventActivity.this,new String[]{Manifest.permission.CAMERA}, RequestPermissionCode);
}
}
// Upload captured image online on server function.
public void ImageUploadToServerFunction(){
ByteArrayOutputStream byteArrayOutputStreamObject ;
byteArrayOutputStreamObject = new ByteArrayOutputStream();
// Converting bitmap image to jpeg format, so by default image will upload in jpeg format.
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStreamObject);
byte[] byteArrayVar = byteArrayOutputStreamObject.toByteArray();
final String ConvertImage = Base64.encodeToString(byteArrayVar, Base64.DEFAULT);
class AsyncTaskUploadClass extends AsyncTask<Void,Void,String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog at image upload time.
progressDialog = ProgressDialog.show(EventActivity.this,"Image is Uploading","Please Wait",
false,false);
}
@Override
protected void onPostExecute(String string1) {
super.onPostExecute(string1);
// Dismiss the progress dialog after done uploading.
progressDialog.dismiss();
// Printing uploading success message coming from server on android app.
Toast.makeText(EventActivity.this,string1,Toast.LENGTH_LONG).show();
// Setting image as transparent after done uploading.
ImageViewHolder.setImageResource(android.R.color.transparent);
}
@Override
protected String doInBackground(Void... params) {
ImageProcessClass imageProcessClass = new ImageProcessClass();
HashMap<String,String> HashMapParams = new HashMap<String,String>();
HashMapParams.put(ImageNameFieldOnServer, GetImageNameFromEditText);
HashMapParams.put(ImageDescOnServer, GetImageDescFromEditText);
HashMapParams.put(ImagePathFieldOnServer, ConvertImage);
String FinalData = imageProcessClass.ImageHttpRequest(ImageUploadPathOnSever, HashMapParams);
return FinalData;
}
}
AsyncTaskUploadClass AsyncTaskUploadClassOBJ = new AsyncTaskUploadClass();
AsyncTaskUploadClassOBJ.execute();
}
public void goBack(View view) {
Intent intent = new Intent(this, IncidentMenuActivity.class);
startActivity(intent);
}
public class ImageProcessClass{
public String ImageHttpRequest(String requestURL,HashMap<String, String> PData) {
StringBuilder stringBuilder = new StringBuilder();
try {
URL url;
HttpURLConnection httpURLConnectionObject ;
OutputStream OutPutStream;
BufferedWriter bufferedWriterObject ;
BufferedReader bufferedReaderObject ;
int RC ;
url = new URL(requestURL);
httpURLConnectionObject = (HttpURLConnection) url.openConnection();
httpURLConnectionObject.setReadTimeout(19000);
httpURLConnectionObject.setConnectTimeout(19000);
httpURLConnectionObject.setRequestMethod("POST");
httpURLConnectionObject.setDoInput(true);
httpURLConnectionObject.setDoOutput(true);
OutPutStream = httpURLConnectionObject.getOutputStream();
bufferedWriterObject = new BufferedWriter(
new OutputStreamWriter(OutPutStream, "UTF-8"));
bufferedWriterObject.write(bufferedWriterDataFN(PData));
bufferedWriterObject.flush();
bufferedWriterObject.close();
OutPutStream.close();
RC = httpURLConnectionObject.getResponseCode();
if (RC == HttpsURLConnection.HTTP_OK) {
bufferedReaderObject = new BufferedReader(new InputStreamReader(httpURLConnectionObject.getInputStream()));
stringBuilder = new StringBuilder();
String RC2;
while ((RC2 = bufferedReaderObject.readLine()) != null){
stringBuilder.append(RC2);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return stringBuilder.toString();
}
private String bufferedWriterDataFN(HashMap<String, String> HashMapParams) throws UnsupportedEncodingException {
StringBuilder stringBuilderObject;
stringBuilderObject = new StringBuilder();
for (Map.Entry<String, String> KEY : HashMapParams.entrySet()) {
if (check)
check = false;
else
stringBuilderObject.append("&");
stringBuilderObject.append(URLEncoder.encode(KEY.getKey(), "UTF-8"));
stringBuilderObject.append("=");
stringBuilderObject.append(URLEncoder.encode(KEY.getValue(), "UTF-8"));
}
return stringBuilderObject.toString();
}
}
@Override
public void onRequestPermissionsResult(int RC, String per[], int[] PResult) {
switch (RC) {
case RequestPermissionCode:
if (PResult.length > 0 && PResult[0] == PackageManager.PERMISSION_GRANTED) {
Toast.makeText(EventActivity.this,"Permission Granted, Now your application can access CAMERA.", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(EventActivity.this,"Permission Canceled, Now your application cannot access CAMERA.", Toast.LENGTH_LONG).show();
}
break;
}
}
}
我做错了什么可能导致它吗？我已经在网上进行了一些研究，这与大多数人使用的方法相同。