@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) {
时间: 2024-02-10 10:17:47 浏览: 29
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。
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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();
}
```
protected void updateClock() { if (mDateFormat == null) { final String dateFormat = getContext().getString(R.string.system_ui_date_pattern); final Locale l = Locale.getDefault(); final String fmt = ICU.getBestDateTimePattern(dateFormat, l.toString()); mDateFormat = new SimpleDateFormat(fmt, l); } mCurrentTime.setTime(System.currentTimeMillis()); final String text = mDateFormat.format(mCurrentTime); if (!text.equals(mLastText)) { setText(text); mLastText = text; } // 实时更新秒 postDelayed(new Runnable() { @Override public void run() { updateClock(); } }, 1000); }这样写,状态栏并没有实时更新秒数
这段代码是一个更新状态栏时间的方法,其中通过获取系统的日期格式,选择合适的格式并将其应用到当前时间上。然后将时间更新到状态栏上,并且每隔一秒钟再次调用该方法,实现实时刷新的效果。
如果状态栏并没有实时更新秒数,可能是因为更新时间的方法没有被正确调用。可以检查是否已经在合适的地方调用了该方法,或者在调用该方法之前是否进行了必要的初始化操作。也可以在方法中增加一些调试信息,查看是否有错误发生。