setBackgroundResource设置背景导致padding错误

  1.问题产生:

      在项目中发现的bug,程序中为textview设置好padding和background背景图片后,在程序中需要动态的修改background图片。

   layout文件如下:

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/container"
              android:orientation="vertical"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:gravity="right"
        >
    <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:paddingLeft="12dp"
            android:paddingRight="12dp"
            android:text="Hello World, MyActivity"
            android:background="@drawable/tip_left"
            />
</LinearLayout>

     在程序中动态修改textview的背景图:如下

        TextView textView = (TextView)findViewById(R.id.text);
        textView.setBackgroundResource(R.drawable.tip_right);

     未修改背景和修改后的背景效果分别如下:

     

      从两图中的区别可以看到修改后padding没了。这貌似是个bug。

   2.修复bug

      经过google查找资料如下
      在Layout中指定好background和padding以后,程序里面动态修改background之后padding就失效了,我们需要在修改background之后重新设置一下padding。
      
        TextView textView = (TextView)findViewById(R.id.text);
        int left = textView.getPaddingLeft();
        int top = textView.getPaddingTop();
        int right = textView.getPaddingRight();
        int bottom = textView.getPaddingBottom();
        textView.setBackgroundResource(R.drawable.tip_right);
        textView.setPadding(left, top, right, bottom);
      经过上面的重新设置padding以后,发现textView中的padding恢复正常。

   3.备注

    1. setPadding()要在setBackgroundResource()之后调用,否则你会发现padding还是失效的。
   2. setPadding()中需要重新设置左上右下四个值,否则你会发现只有你设置的值的对的,其他未设置的值还是错的。
      
       本人就是只用到了paddingLeft和paddingRight,于是只在setPadding函数中设置paddingLeft和paddingRight,其他的设为0,发现只有左右是正常的,上下还是错的。
       还以为是gravity也失效了呢。。囧
       
    先记录下来,希望看到的人少走弯路~~


package com.silan.robotpeisongcontrl; import android.app.AlertDialog; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Configuration; import android.graphics.Color; import android.graphics.drawable.GradientDrawable; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.util.DisplayMetrics; import android.util.Log; import android.util.TypedValue; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.TextView; import android.widget.Toast; import androidx.activity.result.ActivityResultLauncher; import androidx.activity.result.contract.ActivityResultContracts; import com.google.gson.Gson; import com.silan.robotpeisongcontrl.model.Poi; import com.silan.robotpeisongcontrl.model.RobotStatus; import com.silan.robotpeisongcontrl.utils.ExactAlarmPermissionHelper; import com.silan.robotpeisongcontrl.utils.OkHttpUtils; import com.silan.robotpeisongcontrl.utils.RobotController; import java.nio.charset.StandardCharsets; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.List; import java.util.TimeZone; import okio.ByteString; public class MainActivity extends BaseActivity{ private String enteredPassword = ""; private LinearLayout dotsContainer; private Button[] numberButtons = new Button[10]; private Button btnDelete; private AlertDialog passwordDialog; private TextView tvTime; private RelativeLayout mainLayout; private ActivityResultLauncher<Intent> alarmPermissionLauncher; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // 初始化权限请求 alarmPermissionLauncher = registerForActivityResult( new ActivityResultContracts.StartActivityForResult(), result -> ExactAlarmPermissionHelper.handlePermissionResult(this) ); // 检查精确闹钟权限 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S && !ExactAlarmPermissionHelper.canScheduleExactAlarms(this)) { // 请求权限 ExactAlarmPermissionHelper.requestExactAlarmPermission(this, alarmPermissionLauncher); } // 初始化时间显示 tvTime = findViewById(R.id.tv_time); startTimeUpdater(); mainLayout = findViewById(R.id.main_layout); // 应用背景 applyBackground(); // 应用服务设置 applyServiceSettings(); // 配送按钮 Button startDeliveryBtn = findViewById(R.id.btn_start_delivery); adjustButtonSize(startDeliveryBtn); // 巡游模式按钮 Button patrolModeBtn = findViewById(R.id.btn_patrol_mode); adjustButtonSize(patrolModeBtn); // 多点配送按钮 Button multiDeliveryBtn = findViewById(R.id.btn_multi_delivery); adjustButtonSize(multiDeliveryBtn); // 设置按钮 ImageButton btnSettings = findViewById(R.id.btn_settings); startDeliveryBtn.setOnClickListener(v -> { // 检查是否启用了配送验证 SharedPreferences prefs = getSharedPreferences("delivery_prefs", MODE_PRIVATE); boolean verificationEnabled = prefs.getBoolean("verification_enabled", false); if (verificationEnabled) { // 显示送物密码验证对话框 showDeliveryPasswordDialog(false); } else { // 直接开始配送流程 getRobotStatus(false); } }); multiDeliveryBtn.setOnClickListener(v -> { // 检查是否启用了配送验证 SharedPreferences prefs = getSharedPreferences("delivery_prefs", MODE_PRIVATE); boolean verificationEnabled = prefs.getBoolean("verification_enabled", false); if (verificationEnabled) { // 显示送物密码验证对话框 showDeliveryPasswordDialog(true); } else { // 直接开始多点配送流程 getRobotStatus(true); } }); patrolModeBtn.setOnClickListener(v -> { Intent intent = new Intent(MainActivity.this, PatrolActivity.class); startActivity(intent); }); btnSettings.setOnClickListener(v -> { Intent intent = new Intent(MainActivity.this, PasswordAuthActivity.class); intent.putExtra("auth_type", PasswordAuthActivity.AUTH_TYPE_SETTINGS); startActivity(intent); }); } @Override protected void onResume() { super.onResume(); // 每次返回主界面时更新服务设置 applyServiceSettings(); } private void applyServiceSettings() { SharedPreferences prefs = getSharedPreferences("service_prefs", MODE_PRIVATE); // 默认所有服务都启用 boolean deliveryEnabled = prefs.getBoolean("delivery_enabled", true); boolean patrolEnabled = prefs.getBoolean("patrol_enabled", true); boolean multiDeliveryEnabled = prefs.getBoolean("multi_delivery_enabled", true); // 设置按钮可见性 findViewById(R.id.btn_start_delivery).setVisibility(deliveryEnabled ? View.VISIBLE : View.GONE); findViewById(R.id.btn_patrol_mode).setVisibility(patrolEnabled ? View.VISIBLE : View.GONE); findViewById(R.id.btn_multi_delivery).setVisibility(multiDeliveryEnabled ? View.VISIBLE : View.GONE); // 调整布局 adjustLayoutForServiceSettings(); } private void adjustLayoutForServiceSettings() { LinearLayout buttonContainer = findViewById(R.id.button_container); int visibleButtonCount = 0; for (int i = 0; i < buttonContainer.getChildCount(); i++) { View child = buttonContainer.getChildAt(i); if (child.getVisibility() == View.VISIBLE) { visibleButtonCount++; } } // 根据可见按钮数量调整布局 if (visibleButtonCount == 1) { buttonContainer.setGravity(Gravity.CENTER); } else { buttonContainer.setGravity(Gravity.CENTER_VERTICAL); } } //应用背景 private void applyBackground() { SharedPreferences prefs = getSharedPreferences("personalization_prefs", MODE_PRIVATE); int bgResId = prefs.getInt("background_res", R.drawable.bg_default); mainLayout.setBackgroundResource(bgResId); } //时区更新 private void startTimeUpdater() { final Handler handler = new Handler(); final Runnable timeUpdater = new Runnable() { @Override public void run() { updateTime(); handler.postDelayed(this, 1000); } }; handler.post(timeUpdater); } private void updateTime() { SharedPreferences prefs = getSharedPreferences("personalization_prefs", MODE_PRIVATE); String timezoneId = prefs.getString("selected_timezone", "Asia/Shanghai"); TimeZone tz = TimeZone.getTimeZone(timezoneId); Calendar calendar = Calendar.getInstance(tz); SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss"); sdf.setTimeZone(tz); tvTime.setText(sdf.format(calendar.getTime())); } // 将密码验证相关方法重构为通用方法 private void showPasswordDialog(String title, String passwordType, boolean isMultiDelivery) { AlertDialog.Builder builder = new AlertDialog.Builder(this); LayoutInflater inflater = getLayoutInflater(); View dialogView = inflater.inflate(R.layout.dialog_password_auth, null); builder.setView(dialogView); // 设置标题 TextView tvTitle = dialogView.findViewById(R.id.tv_title); tvTitle.setText(title); // 关闭按钮 ImageButton btnClose = dialogView.findViewById(R.id.btn_close); btnClose.setOnClickListener(v -> { if (passwordDialog != null && passwordDialog.isShowing()) { passwordDialog.dismiss(); } }); // 初始化视图 dotsContainer = dialogView.findViewById(R.id.dots_container); numberButtons[0] = dialogView.findViewById(R.id.btn_0); numberButtons[1] = dialogView.findViewById(R.id.btn_1); numberButtons[2] = dialogView.findViewById(R.id.btn_2); numberButtons[3] = dialogView.findViewById(R.id.btn_3); numberButtons[4] = dialogView.findViewById(R.id.btn_4); numberButtons[5] = dialogView.findViewById(R.id.btn_5); numberButtons[6] = dialogView.findViewById(R.id.btn_6); numberButtons[7] = dialogView.findViewById(R.id.btn_7); numberButtons[8] = dialogView.findViewById(R.id.btn_8); numberButtons[9] = dialogView.findViewById(R.id.btn_9); btnDelete = dialogView.findViewById(R.id.btn_delete); // 初始化密码圆点 createPasswordDots(); // 设置数字按钮点击事件 for (int i = 0; i < numberButtons.length; i++) { final int digit = i; numberButtons[i].setOnClickListener(v -> addDigit(String.valueOf(digit),isMultiDelivery)); } // 设置删除按钮点击事件 btnDelete.setOnClickListener(v -> removeDigit()); // 创建对话框 passwordDialog = builder.create(); passwordDialog.setCanceledOnTouchOutside(false); passwordDialog.show(); // 重置输入状态 enteredPassword = ""; updateDotsDisplay(); } /** * 显示送物密码验证对话框 */ private void showDeliveryPasswordDialog(boolean isMultiDelivery) { showPasswordDialog("送物验证", "delivery_password",isMultiDelivery); } /** * 验证送物密码是否正确 */ private boolean validateDeliveryPassword(String enteredPassword) { SharedPreferences prefs = getSharedPreferences("delivery_prefs", MODE_PRIVATE); String correctPassword = prefs.getString("delivery_password", ""); return enteredPassword.equals(correctPassword); } /** * 创建密码圆点指示器 */ private void createPasswordDots() { dotsContainer.removeAllViews(); int dotSize = getResources().getDimensionPixelSize(R.dimen.password_dot_size); int margin = getResources().getDimensionPixelSize(R.dimen.password_dot_margin); for (int i = 0; i < 4; i++) { View dot = new View(this); LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(dotSize, dotSize); params.setMargins(margin, 0, margin, 0); dot.setLayoutParams(params); // 创建圆形背景 GradientDrawable bg = new GradientDrawable(); bg.setShape(GradientDrawable.OVAL); bg.setColor(Color.TRANSPARENT); bg.setStroke(getResources().getDimensionPixelSize(R.dimen.password_dot_stroke), Color.GRAY); dot.setBackground(bg); dotsContainer.addView(dot); } } /** * 添加数字到密码 */ private void addDigit(String digit, boolean isMultiDelivery) { if (enteredPassword.length() < 4) { enteredPassword += digit; updateDotsDisplay(); // 自动检查密码 if (enteredPassword.length() == 4) { if (validateDeliveryPassword(enteredPassword)) { // 验证通过,开始配送流程 getRobotStatus(isMultiDelivery); // 关闭对话框 if (passwordDialog != null && passwordDialog.isShowing()) { passwordDialog.dismiss(); } } else { Toast.makeText(MainActivity.this, "密码错误", Toast.LENGTH_SHORT).show(); enteredPassword = ""; updateDotsDisplay(); } } } } /** * 删除最后一个数字 */ private void removeDigit() { if (enteredPassword.length() > 0) { enteredPassword = enteredPassword.substring(0, enteredPassword.length() - 1); updateDotsDisplay(); } } /** * 更新圆点显示状态 */ private void updateDotsDisplay() { for (int i = 0; i < dotsContainer.getChildCount(); i++) { View dot = dotsContainer.getChildAt(i); if (dot != null) { GradientDrawable bg = (GradientDrawable) dot.getBackground(); if (i < enteredPassword.length()) { // 填充的圆点 bg.setColor(Color.BLACK); bg.setStroke(0, Color.TRANSPARENT); } else { // 空心的圆点 bg.setColor(Color.TRANSPARENT); bg.setStroke(getResources().getDimensionPixelSize(R.dimen.password_dot_stroke), Color.GRAY); } } } } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); adjustButtonSize(findViewById(R.id.btn_start_delivery)); adjustButtonSize(findViewById(R.id.btn_patrol_mode)); adjustButtonSize(findViewById(R.id.btn_multi_delivery)); } private void adjustButtonSize(Button button) { DisplayMetrics displayMetrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(displayMetrics); int screenWidth = displayMetrics.widthPixels; int buttonWidth = (int) (screenWidth * 0.5); buttonWidth = Math.max(dpToPx(150), Math.min(buttonWidth, dpToPx(200))); ViewGroup.LayoutParams params = button.getLayoutParams(); params.width = buttonWidth; params.height = dpToPx(80); button.setLayoutParams(params); } private int dpToPx(int dp) { return (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, dp, getResources().getDisplayMetrics() ); } private void getRobotStatus(boolean isMultiDelivery) { RobotController.getRobotStatus(new OkHttpUtils.ResponseCallback() { @Override public void onSuccess(ByteString responseData) { String json = responseData.string(StandardCharsets.UTF_8); RobotStatus status = RobotController.parseRobotStatus(json); if (status != null && status.getBatteryPercentage() >= 20) { getPoiList(isMultiDelivery); } else { Toast.makeText(MainActivity.this, "电量不足,请充电", Toast.LENGTH_SHORT).show(); } } @Override public void onFailure(Exception e) { Log.d("TAG", "获取机器人状态失败"); } }); } private void getPoiList(boolean isMultiDelivery) { RobotController.getPoiList(new OkHttpUtils.ResponseCallback() { @Override public void onSuccess(ByteString responseData) { String json = responseData.string(StandardCharsets.UTF_8); List<Poi> poiList = RobotController.parsePoiList(json); Intent intent; if (isMultiDelivery) { intent = new Intent(MainActivity.this, MultiDeliveryTaskSelectionActivity.class); } else { intent = new Intent(MainActivity.this, TaskSelectionActivity.class); } intent.putExtra("poi_list", new Gson().toJson(poiList)); startActivity(intent); } @Override public void onFailure(Exception e) { Log.d("TAG", "获取POI信息失败" + e); } }); } } <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/main_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/bg_default" android:padding="16dp"> <!-- 时间显示 --> <TextView android:id="@+id/tv_time" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_marginTop="20dp" android:textColor="@color/white" android:textSize="24sp" /> <LinearLayout android:id="@+id/button_container" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_centerInParent="true" android:orientation="horizontal" android:gravity="center"> <Button android:id="@+id/btn_start_delivery" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="30dp" android:minWidth="150dp" android:minHeight="80dp" android:background="@drawable/button_mint_green_rect" android:text="开始配送" android:textAllCaps="false" android:textSize="18sp" android:layout_marginBottom="30dp"/> <Button android:id="@+id/btn_patrol_mode" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="30dp" android:minWidth="150dp" android:minHeight="80dp" android:background="@drawable/button_mint_green_rect" android:text="巡游模式" android:textAllCaps="false" android:textSize="18sp" android:layout_marginBottom="30dp"/> <Button android:id="@+id/btn_multi_delivery" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="30dp" android:minWidth="150dp" android:minHeight="80dp" android:background="@drawable/button_mint_green_rect" android:text="多点配送" android:textAllCaps="false" android:textSize="18sp"/> </LinearLayout> <!-- 设置按钮 --> <ImageButton android:id="@+id/btn_settings" android:layout_width="55dp" android:layout_height="55dp" android:layout_alignParentTop="true" android:layout_alignParentEnd="true" android:background="?selectableItemBackgroundBorderless" android:src="@drawable/ic_settings" /> </RelativeLayout> 怎么把三个按钮居中显示
最新发布
07-10
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值