Question

我制作了Android蓝牙聊天教程。我想在其他类（MyCursorAdapter.class）中使用OnClickListeners，而不是在主要活动中使用OnClickListeners。

我认为这是一个非常简单的java问题。但我不知道如何实现这个（我如何使用我班级中其他活动的mHandler）。

任何人都可以帮我吗？

Cheers Felix

MainActivity.class中的来源（运作良好）

public class MainActivity extends ListActivity {
private BluetoothService mChatService = null;

...
    private void setupChat() { 
    mButton1 = (Button) findViewById(R.id.button1);

    mButton1.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            byte[] out = {32};  
            mChatService.write(out);
            mChatService = new BluetoothService(this, mHandler);
        }
   });
 }

来源MyCursorAdapter.class（这里我想实现相同的功能）

public class MyCursorAdapter extends ResourceCursorAdapter implements OnClickListener {
...

        private class OffItemClickListener implements OnClickListener {
        private int position;

        public OffItemClickListener(int position) {
            super();
            this.position = position;
        }

        @Override
        public void onClick(View v) {
            mCursor.moveToPosition(position);
               // byte[] out = {32};
               // MainAcitivity.talkChat(out);  
               // error: "non-static variable this cannot be referenced from a static context"


               // Here i want to the the same like in the MainActivity class. 
               // But how can I connect to the mHandler?         
        }
        }
  }

注释：

MainActivity中MyCursorAdapter的实例

private void fillData() {
    Cursor notesCursor = mDbHelper.fetchAllNotes();
    startManagingCursor(notesCursor);


    adapter = new MyCursorAdapter(this, notesCursor);
    setListAdapter(adapter);
}

评论评论：

或者如何从MyCursorAdapter调用此MainActivity方法？：

public void talkChat(byte[] out) { 
   mChatService.write(out); 
   mChatService = new BluetoothService(this, mHandler); 
 }

Answer 1

在MyCursorAdapter类中创建mhandler的实例

     public class MyCursorAdapter extends ResourceCursorAdapter implements  
    OnClickListener {

    private Handler mHandler;

    public void setMHandler(Handler mHandler){
        this.mHandler = mHandler;

    private class OffItemClickListener implements OnClickListener {
    private int position;

    public OffItemClickListener(int position) {
        super();
        this.position = position;
    }

    @Override
    public void onClick(View v) {
        mCursor.moveToPosition(position);
           // byte[] out = {32};
           // MainAcitivity.talkChat(out);  
           // error: "non-static variable this cannot be referenced from a static context"

             Use your mhandler...
           // Here i want to the the same like in the MainActivity class. 
           // But how can I connect to the mHandler?         
    }
    }
    }

并从您的MainActivity中引用它

private void fillData() {
  Cursor notesCursor = mDbHelper.fetchAllNotes();
 startManagingCursor(notesCursor);

adapter = new MyCursorAdapter(this, notesCursor);
adapter.setMHandler(mHandler); //Reference  
setListAdapter(adapter);

}

Android：蓝牙聊天。从另一个类连接到MainActivity中的mHandler

1 个答案: