Android 在ImageView（Parse.com）中加载图像

重要提示：您可以使用：

ParseImageView 以轻松处理此过程。大约从2014年开始，Parse就提供了这一功能。希望它能帮助人们通过谷歌到达这里

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我正在尝试从Parse.com加载一个图像，对象id在ImageView中很方便。但不知何故，当从解析中获取图像时，应用程序正在崩溃。我找不到问题出在哪里的线索。我在布局中有6个ImageView，目前我只尝试在1个ImageView中加载图像，其余的我从Drawable中指定它们的源。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.");
                                    }
                                }
                            });
                }
            });
}}

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根据logcat转储，Login.java的第51行有一个空变量。调试代码，找出原因。

我自己解决了。实际上，在android清单文件中不添加两个权限是一个可怕的错误：

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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谢谢大家！！：）

如果您“不知道问题在哪里”，搜索答案的最佳位置是logcat。@如果您能提供帮助，请添加抗坏血酸logcat？？检查字节[]数据是否为空。@Egor如何检查字节[]数据是否为空。这段代码在解析教程中！！正常情况下，只需使用ParseImageView即可；很容易，我在第51行遇到异常：

ParseFile fileObject=（ParseFile）object.get（“imageFile”）

您需要检查

e

是否不为null，您很可能得到了

ParseException

，这就是对象为null的原因。在第51行之前检查一下。

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

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />