重要提示：您可以使用：
轻松处理此过程。它自2014年左右开始在Parse上市。希望通过谷歌帮助人们到达这里。
我正在尝试使用ImageView中的对象ID从Parse.com加载图像。但不知何故，应用程序在从解析中获取图像时崩溃。我无法找到问题所在的线索。我在布局中有6个图像视图，现在我只想在1个ImageView中加载图像，其余的我从Drawable指定它们的源代码。请帮忙!!
public class Login extends Activity {
EditText fullname, mobilenumber, occupation;
Button save;
ImageView ad2,ad3,ad4,ad5,ad6;
HorizontalScrollView horizontalScrollView1;
private ProgressDialog progressDialog;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.userdata);
fullname = (EditText) findViewById(R.id.fullname) ;
mobilenumber = (EditText) findViewById(R.id.mobile) ;
occupation = (EditText) findViewById(R.id.occupation) ;
save=(Button) findViewById(R.id.btnSave);
horizontalScrollView1=(HorizontalScrollView) findViewById(R.id.horizontalScrollView1);
//ad1=(ImageView) findViewById(R.id.ad1);
ad2=(ImageView) findViewById(R.id.ad2);
ad3=(ImageView) findViewById(R.id.ad3);
ad4=(ImageView) findViewById(R.id.ad4);
ad5=(ImageView) findViewById(R.id.ad5);
ad6=(ImageView) findViewById(R.id.ad6);
progressDialog = ProgressDialog.show(Login.this, "","Downloading Image...", true);
// Locate the class table named "Footer" in Parse.com
ParseQuery<ParseObject> query = new ParseQuery<ParseObject>("Footer");
// Locate the objectId from the class
query.getInBackground("tNp607WyQD", new GetCallback<ParseObject>() {
public void done(ParseObject object,ParseException e) {
// TODO Auto-generated method stub
// Locate the column named "ImageName" and set
// the string
ParseFile fileObject = (ParseFile) object.get("imageFile");
fileObject.getDataInBackground(new GetDataCallback() {
public void done(byte[] data,
ParseException e) {
if (e == null) {
Log.d("test",
"We've got data in data.");
// Decode the Byte[] into
// Bitmap
Bitmap bmp = BitmapFactory.decodeByteArray(data, 0,data.length);
// Get the ImageView from main.xml
//ImageView image = (ImageView) findViewById(R.id.ad1);
ImageView ad1=(ImageView) findViewById(R.id.ad1);
// Set the Bitmap into the
// ImageView
ad1.setImageBitmap(bmp);
// Close progress dialog
progressDialog.dismiss();
} else {
Log.d("test",
"There was a problem downloading the data.");
}
}
});
}
});
}}
布局文件：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="10dip" >
<!-- Full Name Label -->
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Full Name"
android:textColor="#372c24"
tools:ignore="HardcodedText" />
<EditText
android:id="@+id/fullname"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:layout_marginTop="5dip"
android:singleLine="true" />
<!-- Email Label -->
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Mobile number"
android:textColor="#372c24"
tools:ignore="HardcodedText" />
<EditText
android:id="@+id/mobile"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dip"
android:layout_marginTop="5dip"
android:singleLine="true"
android:inputType="phone" />
<!-- Password Label -->
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Occupation"
android:textColor="#372c24"
tools:ignore="HardcodedText" />
<EditText
android:id="@+id/occupation"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:singleLine="true"
tools:ignore="TextFields" />
<!-- Register Button -->
<Button
android:id="@+id/btnSave"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="30dip"
android:text="Save"
tools:ignore="HardcodedText" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff">
<LinearLayout
android:id="@+id/footer"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="90dp"
android:background="#5C03"
android:layout_alignParentBottom="true">
<ImageView
android:id="@+id/ad1"
android:layout_width="90dp"
android:layout_height="wrap_content" />
<HorizontalScrollView
android:id="@+id/horizontalScrollView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="horizontal" >
<ImageView
android:id="@+id/ad2"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_margin="3dp"
android:src="@drawable/bg" />
<ImageView
android:id="@+id/ad3"
android:layout_margin="3dp"
android:src="@drawable/bg"
android:layout_width="90dp"
android:layout_height="wrap_content"/>
<ImageView
android:id="@+id/ad4"
android:layout_margin="3dp"
android:src="@drawable/bg"
android:layout_width="90dp"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/ad5"
android:layout_margin="3dp"
android:layout_width="90dp"
android:src="@drawable/bg"
android:layout_height="wrap_content" />
<ImageView
android:id="@+id/ad6"
android:layout_margin="3dp"
android:layout_width="90dp"
android:src="@drawable/bg"
android:layout_height="wrap_content" />
</LinearLayout>
</HorizontalScrollView>
</LinearLayout>
LogCat：
01-18 20:31:07.290: E/AndroidRuntime(2420): Uncaught handler: thread main exiting due to uncaught exception
01-18 20:31:07.370: E/AndroidRuntime(2420): java.lang.NullPointerException
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.mixorg.parsefooter.Login$1.done(Login.java:51)
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.parse.GetCallback.internalDone(GetCallback.java:43)
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.parse.GetCallback.internalDone(GetCallback.java:1)
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.parse.Parse$6$1.run(Parse.java:818)
01-18 20:31:07.370: E/AndroidRuntime(2420): at android.os.Handler.handleCallback(Handler.java:587)
01-18 20:31:07.370: E/AndroidRuntime(2420): at android.os.Handler.dispatchMessage(Handler.java:92)
01-18 20:31:07.370: E/AndroidRuntime(2420): at android.os.Looper.loop(Looper.java:123)
01-18 20:31:07.370: E/AndroidRuntime(2420): at android.app.ActivityThread.main(ActivityThread.java:4370)
01-18 20:31:07.370: E/AndroidRuntime(2420): at java.lang.reflect.Method.invokeNative(Native Method)
01-18 20:31:07.370: E/AndroidRuntime(2420): at java.lang.reflect.Method.invoke(Method.java:521)
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-18 20:31:07.370: E/AndroidRuntime(2420): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-18 20:31:07.370: E/AndroidRuntime(2420): at dalvik.system.NativeStart.main(Native Method)
01-18 20:31:07.430: E/SemcCheckin(2420): Get crash dump level : java.io.FileNotFoundException: /data/semc-checkin/crashdump
答案 0 :(得分：1)
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
全部谢谢!! ：）
答案 1 :(得分：0)
根据logcat转储，您在Login.java的第51行上有一个null变量。调试代码，找出原因。