在布局充气器中访问组件

Question

房间 b 灯 2 亮，但状态在房间 a 灯 2 状态上变为绿色

我使用另一个布局中的 Layoutinflater 创建了我的主布局。这将动态添加更多控制。我可以在主布局中动态创建尽可能多的子布局。问题是如何在当前子布局操作中访问特定的文本视图。例如，如果我在房间 b 的灯 2 上按下按钮 ON，只有旁边的状态会变成绿色或红色。

这是我加载布局的主要活动

public class MainActivity extends Activity {

Button buttonAdd;
LinearLayout container;
SQLiteDatabase db1;
String sa;
String sb;
TextView txtSta1;
TextView txtSta2;
//TextView txtSta1;
//TextView txtSta2;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    container = (LinearLayout) findViewById(R.id.container);
    createDB();
    allControl();
    LayoutTransition transition = new LayoutTransition();
    container.setLayoutTransition(transition);
}

public void addLayoutControl(String a, String room, String b, String c, final int d) {
    LayoutInflater layoutInflater = (LayoutInflater) getBaseContext()
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    final View addView = layoutInflater.inflate(R.layout.row, null);
    final TextView txtIP = (TextView) addView.findViewById(R.id.textIP);
    final TextView txtRoom = (TextView) addView.findViewById(R.id.textRoom);
    final TextView txtS1 = (TextView) addView.findViewById(R.id.tvS1);
    final TextView txtS2 = (TextView) addView.findViewById(R.id.tvS2);
    txtSta1 = (TextView) addView.findViewById(R.id.textSta1);
    txtSta2 = (TextView) addView.findViewById(R.id.textSta2);
    txtIP.setText(a);
    txtRoom.setText(room);
    txtS1.setText(b);
    txtS2.setText(c);

    new OnStatusSwitch().execute(a);
    Button buttonOn1 = (Button) addView.findViewById(R.id.on1);
    buttonOn1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            new OnSwitch1on2g().execute(txtIP.getText().toString(),"b1on");             
        }
    });
    Button buttonOn2 = (Button) addView.findViewById(R.id.on2);
    buttonOn2.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            new OnSwitch1on2g().execute(txtIP.getText().toString(),"b2on");

        }
    });

    Button buttonOff1 = (Button) addView.findViewById(R.id.off1);
    buttonOff1.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            new OnSwitch1off2g().execute(txtIP.getText().toString(),"b1off");
        }
    });
    Button buttonOff2 = (Button) addView.findViewById(R.id.off2);
    buttonOff2.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            new OnSwitch1off2g().execute(txtIP.getText().toString(),"b2off");
        }
    });

    container.addView(addView, 0);

}

public void callAdd(View v) {
    Intent intent = new Intent(this, AddNode.class);
    startActivity(intent);
}

public void createDB() {
    db1 = this.openOrCreateDatabase("dbcontrol", MODE_PRIVATE, null);
    String sqlcreate = "CREATE TABLE IF NOT EXISTS node" + "(TYPE VARCHAR, IP VARCHAR,LOCATION VARCHAR,S1 VARCHAR, S2 VARCHAR);";
    db1.execSQL(sqlcreate);
}

public void allControl() {
    String sqlSearch = "SELECT * FROM node";
    String sIP = "";
    Cursor c = db1.rawQuery(sqlSearch, null);
    if (c.getCount() > 0) {
        c.moveToFirst();
        //while (!c.()){
        for (int i = 0; i < c.getCount(); i++) {
            sIP = c.getString(c.getColumnIndex("IP"));
            String sLOC = c.getString(c.getColumnIndex("LOCATION"));
            String sS1 = c.getString(c.getColumnIndex("S1"));
            String sS2 = c.getString(c.getColumnIndex("S2"));
            addLayoutControl(sIP, sLOC, sS1, sS2,i);
            c.moveToNext();
        }
    }
}

class OnSwitch1on2g extends AsyncTask<String, String, String> {
    String serverip,cond;
    @Override
    protected void onPreExecute() {
    }

    @Override
    protected String doInBackground(String... params) {
        serverip = params[0];
        cond = params[1];
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://" + serverip + ":88/operation?");

        try {
            // Add your data
            List<BasicNameValuePair> nameValuePairs = new ArrayList<BasicNameValuePair>(1);
            nameValuePairs.add(new BasicNameValuePair("ope", cond));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            httpclient.execute(httppost);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return null;
    }

    protected void onPostExecute(String ab) {
        // new OnStatusSwitch().execute();
        //Toast.makeText(getApplicationContext(), "Success "+serverip+ " button "+cond , Toast.LENGTH_SHORT).show();
        new OnStatusSwitch().execute(serverip);
    }

}

class OnSwitch1off2g extends AsyncTask<String, String, String> {
    String serverip,cond;
    @Override
    protected void onPreExecute() {
    }

    @Override
    protected String doInBackground(String... params) {
        serverip = params[0];
        cond = params[1];
        HttpClient httpclient = new DefaultHttpClient();
        HttpPost httppost = new HttpPost("http://" + serverip + ":88/operation?");

        try {
            // Add your data
            List<BasicNameValuePair> nameValuePairs = new ArrayList<BasicNameValuePair>(1);
            nameValuePairs.add(new BasicNameValuePair("ope", cond));
            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
            httpclient.execute(httppost);
        } catch (Exception e) {
            // TODO: handle exception
        }
        return null;
    } 

    protected void onPostExecute(String ab) {
        // new OnStatusSwitch().execute();
        new OnStatusSwitch().execute(serverip);
        //Toast.makeText(getApplicationContext(), "Success "+serverip+ " button "+cond , Toast.LENGTH_SHORT).show();
    }
}

class OnStatusSwitch extends AsyncTask<String, String, String> {
    JSONParser jsonparser = new JSONParser();
    JSONObject jobj = null;
    String pina;
    String pinb;

    @Override
    protected String doInBackground(String... params) {
        try {
            String serverip = params[0];
            String url = "http://" + serverip + ":88/getstatus";
            jobj = jsonparser.makeHttpRequest(url);
            pina = jobj.getString("pin1");
            pinb = jobj.getString("pin2");
            runOnUiThread(new Runnable() {
                public void run() {
                    if (pina.equals("0")) {
                        txtSta1.setBackgroundColor(Color.GREEN);
                    }else{
                        txtSta1.setBackgroundColor(Color.RED);
                    }
                    if (pinb.equals("0")) {
                        txtSta2.setBackgroundColor(Color.GREEN);                        
                    }else{
                        txtSta2.setBackgroundColor(Color.RED);
                    }
                }

            });
            return pina+pinb;
        } catch (Exception e2) {
        }
        return null;
    }

    protected void onPostExecute(String ab) {
        sa =  ab.substring(0,1);
        sb =  ab.substring(1);

    }       
}

这真的让我很烦恼..需要帮助来解决这个问题..不太熟悉布局控制。

Answer 1

首先，我推荐一个 ToggleButton or Switch 而不是 2 个单独的按钮，但是如果您想将 TextView 的状态“绑定”到按钮，您可以简单地创建一个自定义 ClickListener 类。

class MyCheckChangedListener implements CompoundButton.OnCheckedChangeListener {
    private TextView tv;

    public MyCheckChangedListener(TextView tv) {
        this.tv = tv;
    }

    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        // TODO: if (isChecked) { do network operation }
        tv.setBackgroundColor(isChecked ? Color.GREEN : Color.RED);
    }
};

---

要使用，就这样做

TextView txtStatus = (TextView) findViewById(R.id.status);
ToggleButton toggle = (ToggleButton) findViewById(R.id.togglebutton);
toggle.setOnCheckedChangeListener(new MyCheckChangedListener(txtStatus));

不过，ToggleButton 的好处在于您甚至不需要 TextView，您可以通过查看按钮本身的状态来查看“状态”。