Question

我在onCreate（）中有一些代码冻结了UI线程。我已经尝试过以我能找到的每种不同方式使其在后台执行。我唯一能想到的是我在主UI线程中有其他firebase事件监听器，所以即使代码在后台执行，其他监听器也会在后台更新时冻结活动。或者我的代码可能没有真正到达背景？有没有人有任何建议？

  AsyncTask.execute(new Runnable() {
        @Override
        public void run() {
            //tried it here
    }
});

////////

Thread thread = new Thread() {
        @Override
        public void run() {
            //tried it here
    }
 });

thread.start();

/////

Runnable runnable = new Runnable() {
    @Override
    public void run() {
        //tried it here
    }
};
AsyncTask.execute(runnable);

///这是代码。我此刻正在尝试这种方式。

 Thread custListLoadThread = new Thread(runnable);
    custListLoadThread.start();


}

private Runnable runnable = new Runnable() {
    @Override
    public void run() {

        mSelectedPlayerRef.child(mSelectedPlayer.getUsername()).setValue(mEmptyResultsItems);

        final ArrayList<String> mEnteredPlayers = new ArrayList<>();

        mEntriesRef.addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {

                for(DataSnapshot entries: dataSnapshot.getChildren()){

                    Player player = entries.getValue(Player.class);
                    mEnteredPlayers.add(player.getUsername());

                    Player draftedPlayer = entries.getValue(Player.class);
                    mEntriesRef.child(draftedPlayer.getUsername()).child("VS")
                            .child(mSelectedPlayer.getUsername()).setValue(mEmptyResultsItems);

                }
                for(String enteredPlayer: mEnteredPlayers){



                    mSelectedPlayerRef.child(enteredPlayer).setValue(mEmptyResultsItems);
                }
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {

            }

        });

    }
};

所有这些都冻结了UI线程。

Answer 1

我还没有对此进行测试，但这就是我要做的： `

    final ArrayList<String> mEnteredPlayers = new ArrayList<>();

    mEntriesRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            new Thread(new Runnable() {
                for(DataSnapshot entries: dataSnapshot.getChildren()){

                    Player player = entries.getValue(Player.class);
                    mEnteredPlayers.add(player.getUsername());

                    Player draftedPlayer = entries.getValue(Player.class);
                    mEntriesRef.child(draftedPlayer.getUsername()).child("VS").child(mSelectedPlayer.getUsername()).setValue(mEmptyResultsItems);

                }
                for(String enteredPlayer: mEnteredPlayers){
                    mSelectedPlayerRef.child(enteredPlayer).setValue(mEmptyResultsItems);
                }
            }).start();
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }

    });

`

Answer 2

尝试删除线程并在OnCreate方法中运行代码....像这样

@覆盖 protected void onCreate（Bundle savedInstanceState）{ super.onCreate（savedInstanceState）; 的setContentView（R.layout.activity_main）;

    mSelectedPlayerRef.child(mSelectedPlayer.getUsername()).setValue(mEmptyResultsItems);

    final ArrayList<String> mEnteredPlayers = new ArrayList<>();

    mEntriesRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

            for(DataSnapshot entries: dataSnapshot.getChildren()){

                Player player = entries.getValue(Player.class);
                mEnteredPlayers.add(player.getUsername());

                Player draftedPlayer = entries.getValue(Player.class);
                mEntriesRef.child(draftedPlayer.getUsername()).child("VS")
                        .child(mSelectedPlayer.getUsername()).setValue(mEmptyResultsItems);

            }
            for(String enteredPlayer: mEnteredPlayers){



                mSelectedPlayerRef.child(enteredPlayer).setValue(mEmptyResultsItems);
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }

}

Answer 3

使用处理程序：

protected static Handler sHandler = new Handler();

使用您按原样创建的Runnable。

然后代替：

Thread custListLoadThread = new Thread(runnable);
custListLoadThread.start();

使用：

sHandler.post(runnable);

Android后台任务冻结UI线程 - 更新Firebase

3 个答案: