@Override protected void onDialogClosed(boolean positiveResult) { if (positiveResult) { try { final Resources res = getContext().getResources(); final DisplayMetrics metrics = res.getDisplayMetrics(); final int newSwDp = Math.max(Integer.parseInt(getText()), 270); final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels); final int newDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp; final int densityDpi = Math.max(newDensity, 120); DisplayDensityConfiguration.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi); } catch (Exception e) { // TODO: display a message instead of silently failing. Slog.e(TAG, "Couldn't save density", e);

这段代码看起来像是 Android 开发中的一个对话框关闭时的回调函数，它会尝试修改设备的屏幕密度（densityDpi）来实现模拟不同的屏幕尺寸。如果设备的屏幕尺寸小于用户输入的最小尺寸（newSwDp），则会将屏幕密度设置为 DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp。如果出现异常，则会在日志中记录错误信息。你需要提供更多的上下文和问题细节，才能更好地回答你的问题。

相关问题

@Override protected void onDialogClosed(boolean positiveResult) { if (positiveResult) { try { final Resources res = getContext().getResources(); final DisplayMetrics metrics = res.getDisplayMetrics(); final int newSwDp = Math.max(Integer.parseInt(getText()), 320); final int minDimensionPx = Math.min(metrics.widthPixels, metrics.heightPixels); final int newDensity = DisplayMetrics.DENSITY_MEDIUM * minDimensionPx / newSwDp; final int densityDpi = Math.max(newDensity, 120); DisplayDensityConfiguration.setForcedDisplayDensity(Display.DEFAULT_DISPLAY, densityDpi); } catch (Exception e) {

这段代码是 Android 中的一个类的重写方法 onDialogClosed，该方法在对话框关闭时被调用。如果用户点击了对话框中的“确定”按钮（positiveResult 为 true），则会执行该方法中的代码。该代码的目的是根据用户输入的值来计算新的屏幕密度，并将其设置为系统的强制显示密度。其中，该代码将用户输入的值（即 getText() 方法返回的字符串）转换为整数，并将其与 320 取最大值，然后根据计算公式来计算新的屏幕密度。最后，通过调用 DisplayDensityConfiguration 类的 setForcedDisplayDensity 方法来设置系统的强制显示密度。如果在执行该代码过程中发生了异常，将捕获该异常并不做处理。

protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ipEditText = findViewById(R.id.ipEditText); portEditText = findViewById(R.id.portEditText); Button connectButton = findViewById(R.id.connectButton); connectButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String ip = ipEditText.getText().toString(); int port = Integer.parseInt(portEditText.getText().toString()); new ConnectTask().execute(ip, String.valueOf(port)); } }); Button sendMessageButton = findViewById(R.id.sendMessageButton); sendMessageButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { showSendMessageDialog(); } }); } private class ConnectTask extends AsyncTask<String, Void, Void> { @Override protected Void doInBackground(String... params) { String ip = params[0]; int port = Integer.parseInt(params[1]); try { socket = new Socket(ip, port); in = new BufferedReader(new InputStreamReader(socket.getInputStream())); out = new PrintWriter(socket.getOutputStream(), true); } catch (UnknownHostException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } @Override protected void onPostExecute(Void aVoid) { super.onPostExecute(aVoid); // 获取SeekBar对象 SeekBar progressBar = findViewById(R.id.progressBar); // 添加OnSeekBarChangeListener监听器 progressBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() { @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // 计算百分比对应的数字 int number = progress * 10; out.println(number); } @Override public void onStartTrackingTouch(SeekBar seekBar) { } @Override public void onStopTrackingTouch(SeekBar seekBar) { } }); } } @Override protected void onDestroy() { super.onDestroy(); try { if (in != null) { in.close(); } if (out != null) { out.close(); } if (socket != null) { socket.close(); } } catch (IOException e) { e.printStackTrace(); } } private void showSendMessageDialog() { AlertDialog.Builder builder = new AlertDialog.Builder(this); LayoutInflater inflater = getLayoutInflater(); View view = inflater.inflate(R.layout.dialog_send_message, null); final EditText messageEditText = view.findViewById(R.id.messageEditText); builder.setView(view) .setTitle("发送消息") .setPositiveButton("发送", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { String message = messageEditText.getText().toString(); if (out != null) { out.println(message); } } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }) .create() .show(); }代码有问题，能帮我修改一下吗

在代码中没有明确指定变量的类型，在Java中要求变量的类型必须明确指定，因此需要修改代码中的变量类型。

另外，在 ConnectTask 类中的 onPostExecute 方法中，代码逻辑有误，需要进行修改。

修改后的代码如下所示：

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

    final EditText ipEditText = findViewById(R.id.ipEditText);
    final EditText portEditText = findViewById(R.id.portEditText);

    Button connectButton = findViewById(R.id.connectButton);
    connectButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String ip = ipEditText.getText().toString();
            int port = Integer.parseInt(portEditText.getText().toString());
            new ConnectTask().execute(ip, String.valueOf(port));
        }
    });

    Button sendMessageButton = findViewById(R.id.sendMessageButton);
    sendMessageButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            showSendMessageDialog();
        }
    });
}

private class ConnectTask extends AsyncTask<String, Void, Void> {
    private Socket socket;
    private BufferedReader in;
    private PrintWriter out;

    @Override
    protected Void doInBackground(String... params) {
        String ip = params[0];
        int port = Integer.parseInt(params[1]);
        try {
            socket = new Socket(ip, port);
            in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            out = new PrintWriter(socket.getOutputStream(), true);
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        if (socket != null) {
            // 获取SeekBar对象
            final SeekBar progressBar = findViewById(R.id.progressBar);

            // 添加OnSeekBarChangeListener监听器
            progressBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
                @Override
                public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                    // 计算百分比对应的数字
                    int number = progress * 10;
                    out.println(number);
                }

                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {

                }

                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {

                }
            });
        }
    }
}

@Override
protected void onDestroy() {
    super.onDestroy();
    try {
        if (in != null) {
            in.close();
        }
        if (out != null) {
            out.close();
        }
        if (socket != null) {
            socket.close();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void showSendMessageDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    LayoutInflater inflater = getLayoutInflater();
    View view = inflater.inflate(R.layout.dialog_send_message, null);
    final EditText messageEditText = view.findViewById(R.id.messageEditText);
    builder.setView(view)
            .setTitle("发送消息")
            .setPositiveButton("发送", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    String message = messageEditText.getText().toString();
                    if (out != null) {
                        out.println(message);
                    }
                }
            })
            .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {
                    dialog.cancel();
                }
            })
            .create()
            .show();
}