Android Firebase，显示图像在警报对话框中从Firebase检索

Question

我一直在尝试显示从firebase中检索到的图像。我已经为警报对话框创建了自定义布局。但是，我数量在其中显示图像。使用Glide检索任何图像。任何反馈都将不胜感激！您可以检查我的代码;

/AndroidRuntime: FATAL EXCEPTION: main
              Process: com.example.aliihsangokalp.casepool, PID: 15517
              java.lang.NullPointerException: Argument must not be null
                  at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:27)
                  at com.bumptech.glide.util.Preconditions.checkNotNull(Preconditions.java:22)
                  at com.bumptech.glide.RequestBuilder.into(RequestBuilder.java:595)
                  at com.example.aliihsangokalp.casepool.CaseSingleActivity$2.onDataChange(CaseSingleActivity.java:112)
                  at com.google.android.gms.internal.zzeex.zza(Unknown Source)
                  at com.google.android.gms.internal.zzegs.zzbwg(Unknown Source)
                  at com.google.android.gms.internal.zzegy.run(Unknown Source)
                  at android.os.Handler.handleCallback(Handler.java:751)
                  at android.os.Handler.dispatchMessage(Handler.java:95)
                  at android.os.Looper.loop(Looper.java:154)
                  at android.app.ActivityThread.main(ActivityThread.java:6682)
                  at java.lang.reflect.Method.invoke(Native Method)
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)

，您也可以检查我遇到的错误

private String mPost_key = null;
private DatabaseReference mDatabase;
private TextView mCaseSingleTitle;
private TextView mCaseSingleDesc;
private Button bttn;
private ImageView ımageView;
private ProgressDialog mProgress;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_case_single);

    mDatabase = FirebaseDatabase.getInstance().getReference().child("Cases");
    mPost_key = getIntent().getExtras().getString("case_id");
    mCaseSingleDesc = (TextView) findViewById(R.id.singleCaseDesc);
    mCaseSingleTitle = (TextView) findViewById(R.id.singleCaseTitle);
    bttn = (Button) findViewById(R.id.seeImage);

    final LayoutInflater inf = this.getLayoutInflater();
    mProgress = new ProgressDialog(this);

    bttn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            final View aaa = inf.inflate(R.layout.photo,null);
             ımageView = aaa.findViewById(R.id.singleCaseImage);
            final AlertDialog.Builder ImageDialog = new AlertDialog.Builder(CaseSingleActivity.this);

            ImageDialog.setTitle("Here is the photo : ");
            ImageDialog.setView(aaa);

            ImageDialog.setNegativeButton("ok", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                }
            });
            ImageDialog.show();

           }});
        mDatabase.child(mPost_key).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            if(dataSnapshot.exists()) {
                String post_title = (String) dataSnapshot.child("title").getValue();
                String post_desc = (String) dataSnapshot.child("desc").getValue();
                String post_image = (String) dataSnapshot.child("image").getValue();
                String post_uid = (String) dataSnapshot.child("uid").getValue();
                mCaseSingleTitle.setText(post_title);
                mCaseSingleDesc.setText(post_desc);
                Glide.with(CaseSingleActivity.this).load(post_image).apply(new RequestOptions().fitCenter().override(1000,1000).dontAnimate().dontTransform()).into(ımageView) ;
                mProgress.dismiss();
            }
        }
        @Override
        public void onCancelled(DatabaseError databaseError) {
        mProgress.dismiss();
        }
          });
          }
         }

Answer 1

看起来数据库的路径是null的，请将Intent的putExtra()键存储在常数public static final变量中，这样您就不会在检索它时错误地键入新密钥。blockquote>

检查您的Intent Extra

public static final String key = "case_id";
Intent intent = new Intent(this, ToYourActivity.class);
intent.putExtra(key, "urlOfImage.com/fsfd/asd.jpg");
startActivity(intent);
//retrieving from another class
mPost_key = getIntent().getExtras().getString(PeviousClass.key);