我正在尝试从Parse中的用户类获取文件（配置文件图像）。 这是我正在尝试的代码但是我收到以下错误，我哪里出错？
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
navigationItemsList = new ArrayList<DrawerItem>();
addItemsToNavigationList();
mRecyclerView = (RecyclerView) findViewById(R.id.RecyclerView);
mRecyclerView.setHasFixedSize(true);
mAdapter = new com.charity.dogood.dogood.adapters.NavDrawerAdapter(navigationItemsList, this, HEADER_NAME, HEADER_EMAIL, HEADER_IMAGE);
mRecyclerView.setAdapter(mAdapter);
//Parse Image and details of the logged in user
// Locate the class table named "ImageUpload" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("User");
Log.d("Mainactivity", "After query 1");
ParseUser currentUser = ParseUser.getCurrentUser();
Log.d("Mainactivity", "After query 2");
query.whereEqualTo("username", currentUser);
Log.d("Mainactivity", "After query 3");
// String usernam = (String)currentUser;
if(currentUser != null){
Log.d("Mainactivity", "came to current user check statement");
query.getInBackground(currentUser.getUsername().toString(), new GetCallback<ParseObject>() {
@Override
public void done(ParseObject object, ParseException e) {
ParseFile fileObject = (ParseFile) object.get("ImageProfile");
fileObject.getDataInBackground(new GetDataCallback() {
@Override
public void done(byte[] bytes, ParseException e) {
if (e == null) {
Toast.makeText(MainActivity.this, "Welcome Back", Toast.LENGTH_LONG).show();
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
// HEADER_IMAGE image = (ImageView) fin
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(e.getMessage());
builder.setTitle("Sorry");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
});
Log.d("Mainactivity", "After query 4");
}
ERROR
07-17 14:11:40.030: D/Mainactivity(3857): After query 1
07-17 14:11:40.030: D/Mainactivity(3857): After query 2
07-17 14:11:40.030: D/Mainactivity(3857): After query 3
07-17 14:11:40.030: D/Mainactivity(3857): came to current user check statement
07-17 14:11:40.030: D/Mainactivity(3857): After query 4
07-17 14:11:40.120: V/WindowManager(463): Adding window Window{267de77b u0 com.charity.dogood.dogood/com.charity.dogood.dogood.activities.MainActivity} at 3 of 9 (after Window{3da1ef5a u0 com.charity.dogood.dogood/com.charity.dogood.dogood.activities.Login})
07-17 14:11:40.220: W/EGL_emulation(3857): eglSurfaceAttrib not implemented
07-17 14:11:40.220: W/OpenGLRenderer(3857): Failed to set EGL_SWAP_BEHAVIOR on surface 0xa207d700, error=EGL_SUCCESS
07-17 14:11:40.276: I/ActivityManager(463): Displayed com.charity.dogood.dogood/.activities.MainActivity: +283ms
07-17 14:11:40.421: D/AndroidRuntime(3857): Shutting down VM
07-17 14:11:40.421: E/AndroidRuntime(3857): FATAL EXCEPTION: main
07-17 14:11:40.421: E/AndroidRuntime(3857): Process: com.charity.dogood.dogood, PID: 3857
07-17 14:11:40.421: E/AndroidRuntime(3857): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object com.parse.ParseObject.get(java.lang.String)' on a null object reference
07-17 14:11:40.421: E/AndroidRuntime(3857): at com.charity.dogood.dogood.activities.MainActivity$1.done(MainActivity.java:104)
07-17 14:11:40.421: E/AndroidRuntime(3857): at com.charity.dogood.dogood.activities.MainActivity$1.done(MainActivity.java:99)
07-17 14:11:40.421: E/AndroidRuntime(3857): at com.parse.Parse$6$1.run(Parse.java:944)
07-17 14:11:40.421: E/AndroidRuntime(3857): at android.os.Handler.handleCallback(Handler.java:739)
07-17 14:11:40.421: E/AndroidRuntime(3857): at android.os.Handler.dispatchMessage(Handler.java:95)
07-17 14:11:40.421: E/AndroidRuntime(3857): at android.os.Looper.loop(Looper.java:135)
07-17 14:11:40.421: E/AndroidRuntime(3857): at android.app.ActivityThread.main(ActivityThread.java:5254)
07-17 14:11:40.421: E/AndroidRuntime(3857): at java.lang.reflect.Method.invoke(Native Method)
07-17 14:11:40.421: E/AndroidRuntime(3857): at java.lang.reflect.Method.invoke(Method.java:372)
07-17 14:11:40.421: E/AndroidRuntime(3857): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
07-17 14:11:40.421: E/AndroidRuntime(3857): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
更新：
@Override
public void done(ParseObject object, ParseException e) {
ParseFile fileObject = (ParseFile) object.get("ImageProfile");
if(fileObject != null) {
fileObject.getDataInBackground(new GetDataCallback() {
@Override
public void done(byte[] bytes, ParseException e) {
if (e == null) {
Toast.makeText(MainActivity.this, "Welcome Back", Toast.LENGTH_LONG).show();
Bitmap bmp = BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
// HEADER_IMAGE image = (ImageView) fin
} else {
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(e.getMessage());
builder.setTitle("Sorry");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
}
});
}
else
{
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setMessage(e.getMessage());
builder.setTitle("Sorry");
builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
答案 0 :(得分：1)
鉴于用户已登录，这对我有用。
private void setUserImage() {
ImageView imgUser = (ImageView) findViewById(R.id.yourImage);
ParseUser currentUser = ParseUser.getCurrentUser();
try {
ParseFile img = currentUser.getParseFile("userImage");
Bitmap bmp = BitmapFactory.decodeStream(img.getDataStream());
imgUser.setImageBitmap(bmp);
} catch (Exception e) {
e.printStackTrace();
}
}