Question

我在将数据从一个活动传递到另一个活动时遇到了麻烦，我想将单击的项目的值传递给另一个活动，在下面的代码中，它仅是最后的数据，而不是单击的项目，非常感谢您的帮助。

            public class list_view extends AppCompatActivity {

private ArrayAdapter<String> arrayAdapter;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_list_view);

    final String uid = FirebaseAuth.getInstance().getCurrentUser().getUid();
    DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
    final DatabaseReference uidRef = rootRef.child("ProgressReports").child(uid);
    final List<String> list = new ArrayList<>();
    final ArrayList<String> id = new ArrayList<>();
    final Context context = this;
    EditText searchBarProgress = findViewById(R.id.searchBarProgress);
    arrayAdapter = new ArrayAdapter<>(getApplicationContext(), android.R.layout.simple_list_item_1, list);

    String key = uidRef.push().getKey();
    ReportInformation report = new ReportInformation();
    report.setTitle("title");
    report.setContent("content");
    report.setKey(key);
    uidRef.child(key).setValue(report);


    ValueEventListener eventListener = new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
            for (DataSnapshot ds : dataSnapshot.getChildren()) {
                id.add(ds.getKey());
                String title = ds.child("title").getValue(String.class);
                String content = ds.child("content").getValue(String.class);
                String timestamp = ds.child("timestamp").getValue(String.class);
                list.add(title + "\n" + timestamp + "\n" + content);
                Log.d("TAG", title);
            }
            ListView listView = findViewById(R.id.progressList);
            listView.setAdapter(arrayAdapter);

        }

        @Override
        public void onCancelled(@NonNull DatabaseError databaseError) {

        }
    };
    uidRef.addListenerForSingleValueEvent(eventListener);

    final ListView progressList = findViewById(R.id.progressList);

    progressList.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int x, long l) {

            ValueEventListener eventListener = new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                    ArrayList<ReportInformation> list = new ArrayList<>();
                    for (DataSnapshot ds : dataSnapshot.getChildren()) {
                        ReportInformation report = ds.getValue(ReportInformation.class);
                        list.add(report);
                    }
                    Intent intent = new Intent(list_view.this, ProgressReports.class);
                    ListView listView = findViewById(R.id.progressList);
                    listView.setAdapter(arrayAdapter);
                    startActivity(intent);
                    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                        @Override
                        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {

                        }
                    });
                }


                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {

                }
            };
            uidRef.addListenerForSingleValueEvent(eventListener);
        }
    });

为了显示我的意思，无论我在下面的列表视图中按下哪个按钮，传递的数据都是Test 4

下面是我的Firebase结构

对象的模型类

public class ReportInformation {
private String title;
private String content;
private String timestamp;
private String key;

public ReportInformation(){

}

public String getTitle() {
    return title;
}

public String getKey() {
    return key;
}

public void setKey(String key) {
    this.key = key;
}

public void setTitle(String title) {
    this.title = title;
}

public String getContent() {
    return content;
}

public void setContent(String content) {
    this.content = content;
}

public String getTimestamp() {
    return timestamp;
}

public void setTimestamp(String timestamp) {
    this.timestamp = timestamp;
}
}

尝试执行此操作时出现以下错误

新错误

Answer 1

要解决此问题，您首先需要实现Serializable接口，如下所示：

ReportInformation implements Serializable {}

因此，要将整个ReportInformation对象传递到下一个活动，您应该使用以下代码行：

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
        ReportInformation reportInformation = arrayAdapter.getItem(i);
        Intent intent = new Intent(list_view.this, ProgressReports.class);
        intent.putExtra("object", reportInformation);
        startActivity(intent);
    }
});

将Firebase数据从一项活动传递到另一项活动，即ListView的onClick

1 个答案: