稍微完善输入法以及输入法体验页

app/src/main/java/com/example/myapplication/ImeGuideActivity.kt

@@ -5,28 +5,27 @@ import android.content.Intent
 import android.graphics.Color
 import android.os.Bundle
 import android.provider.Settings
-import android.view.View
+import android.util.Log
 import android.view.inputmethod.InputMethodManager
-import android.widget.Button
 import android.widget.ImageView
 import android.widget.LinearLayout
-import android.widget.FrameLayout
 import android.widget.TextView
 import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
-import com.example.myapplication.MyInputMethodService
-
 
 class ImeGuideActivity : AppCompatActivity() {
 
-    private lateinit var btnEnable: LinearLayout
-    private lateinit var btnSelect: LinearLayout
-    private lateinit var tvStep1Status: TextView//
-    private lateinit var tvStep2Status: TextView//
-    private lateinit var btnEnabledText: TextView//
-    private lateinit var btnSelectText: TextView//
-    private lateinit var btnEnabledimg: ImageView//
-    private lateinit var btnSelectimg: ImageView//
+    private val TAG = "ImeGuideActivity"
+
+    // 改成可空，避免 findViewById 返回 null 时直接 NPE
+    private var btnEnable: LinearLayout? = null
+    private var btnSelect: LinearLayout? = null
+    private var tvStep1Status: TextView? = null
+    private var tvStep2Status: TextView? = null
+    private var btnEnabledText: TextView? = null
+    private var btnSelectText: TextView? = null
+    private var btnEnabledimg: ImageView? = null
+    private var btnSelectimg: ImageView? = null
 
     private var imeObserver: android.database.ContentObserver? = null
 
@@ -34,68 +33,79 @@ class ImeGuideActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_ime_guide)
 
-        // // 设置关闭按钮点击事件
-        // findViewById<FrameLayout>(R.id.iv_close).setOnClickListener {
-        //     finish()
-        // }
+        Log.d(TAG, "onCreate")
 
-        btnEnable = findViewById(R.id.enabled)//btn启用输入法
-        btnSelect = findViewById(R.id.select)//btn选择输入法
-        tvStep1Status = findViewById(R.id.Steps)//第一步的提示
-        tvStep2Status = findViewById(R.id.stepTips)//第二步的提示
-        btnEnabledText = findViewById(R.id.btnEnabledText)//启用输入法按钮文字
-        btnSelectText = findViewById(R.id.btnSelectText)//选择输入法按钮文字
-        btnEnabledimg = findViewById(R.id.btnEnabledimg)//启用输入法按钮图片
-        btnSelectimg = findViewById(R.id.btnSelectimg)//选择输入法按钮图片
-
-        // // 第一步：启用输入法
-        // btnEnable.setOnClickListener {
-        //     startActivity(Intent(Settings.ACTION_INPUT_METHOD_SETTINGS))
-        // }
-        
-
-        // // 第二步：切换输入法
-        // btnSelect.setOnClickListener {
-        //     val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
-        //     imm.showInputMethodPicker()
-        // }
+        btnEnable = findViewById(R.id.enabled)            // btn启用输入法
+        btnSelect = findViewById(R.id.select)            // btn选择输入法
+        tvStep1Status = findViewById(R.id.Steps)         // 第一步的提示
+        tvStep2Status = findViewById(R.id.stepTips)      // 第二步的提示
+        btnEnabledText = findViewById(R.id.btnEnabledText)   // 启用输入法按钮文字
+        btnSelectText = findViewById(R.id.btnSelectText)     // 选择输入法按钮文字
+        btnEnabledimg = findViewById(R.id.btnEnabledimg)     // 启用输入法按钮图片
+        btnSelectimg = findViewById(R.id.btnSelectimg)       // 选择输入法按钮图片
     }
 
     override fun onResume() {
         super.onResume()
-        refreshStatus()
-        registerImeObserver()
+        try {
+            refreshStatus()
+        } catch (e: Exception) {
+            Log.e(TAG, "refreshStatus 崩了", e)
+        }
+
+        try {
+            registerImeObserver()
+        } catch (e: Exception) {
+            Log.e(TAG, "registerImeObserver 崩了", e)
+        }
     }
 
     override fun onPause() {
         super.onPause()
-        unregisterImeObserver()
+        try {
+            unregisterImeObserver()
+        } catch (e: Exception) {
+            Log.e(TAG, "unregisterImeObserver 崩了", e)
+        }
     }
 
     private fun registerImeObserver() {
         if (imeObserver != null) return
-    
+
         imeObserver = object : android.database.ContentObserver(
             android.os.Handler(android.os.Looper.getMainLooper())
         ) {
             override fun onChange(selfChange: Boolean) {
                 super.onChange(selfChange)
-                refreshStatus()
+                try {
+                    refreshStatus()
+                } catch (e: Exception) {
+                    Log.e(TAG, "onChange -> refreshStatus 崩了", e)
+                }
             }
         }
-    
-        contentResolver.registerContentObserver(
-            android.provider.Settings.Secure.getUriFor(
-                android.provider.Settings.Secure.DEFAULT_INPUT_METHOD
-            ),
-            false,
-            imeObserver!!
-        )
+
+        try {
+            contentResolver.registerContentObserver(
+                Settings.Secure.getUriFor(Settings.Secure.DEFAULT_INPUT_METHOD),
+                false,
+                imeObserver!!
+            )
+        } catch (e: SecurityException) {
+            // 部分 ROM/系统可能在这里抛异常
+            Log.e(TAG, "registerContentObserver SecurityException", e)
+        } catch (e: Exception) {
+            Log.e(TAG, "registerContentObserver 其他异常", e)
+        }
     }
-    
+
     private fun unregisterImeObserver() {
         imeObserver?.let {
-            contentResolver.unregisterContentObserver(it)
+            try {
+                contentResolver.unregisterContentObserver(it)
+            } catch (e: Exception) {
+                Log.e(TAG, "unregisterContentObserver 异常", e)
+            }
         }
         imeObserver = null
     }
@@ -104,100 +114,144 @@ class ImeGuideActivity : AppCompatActivity() {
     private fun refreshStatus() {
         val enabled = isImeEnabled()
         val selected = isImeSelected()
-        
+
+        // 把所有 view 拿成局部变量并判空，避免 NPE
+        val enableLayout = btnEnable
+        val selectLayout = btnSelect
+        val step1 = tvStep1Status
+        val step2 = tvStep2Status
+        val enableText = btnEnabledText
+        val selectText = btnSelectText
+        val enableImg = btnEnabledimg
+        val selectImg = btnSelectimg
+
+        if (enableLayout == null || selectLayout == null ||
+            step1 == null || step2 == null ||
+            enableText == null || selectText == null ||
+            enableImg == null || selectImg == null
+        ) {
+            Log.e(TAG, "有 View 为 null，检查 activity_ime_guide.xml 的 id 是否匹配")
+            return
+        }
+
         // 根据状态设置按钮的点击行为
         if (enabled) {
             // 输入法已启用时，禁用启用按钮的点击事件
-            btnEnable.setOnClickListener(null)
+            enableLayout.setOnClickListener(null)
         } else {
             // 输入法未启用时，设置启用按钮的点击事件
-            btnEnable.setOnClickListener {
+            enableLayout.setOnClickListener {
                 startActivity(Intent(Settings.ACTION_INPUT_METHOD_SETTINGS))
             }
         }
 
         if (selected) {
             // 输入法已切换时，禁用选择按钮的点击事件
-            btnSelect.setOnClickListener(null)
+            selectLayout.setOnClickListener(null)
         } else {
             // 输入法未切换时，设置选择按钮的点击事件
-            btnSelect.setOnClickListener {
+            selectLayout.setOnClickListener {
                 val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
                 imm.showInputMethodPicker()
             }
         }
 
-        if(!enabled &&!selected) {
-            btnEnable.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
-            btnSelect.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
-            btnEnabledText.setTextColor(Color.parseColor("#FFFFFF"))
-            btnSelectText.setTextColor(Color.parseColor("#FFFFFF"))
-            btnEnabledimg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
-            btnSelectimg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
-            tvStep1Status.text = "Step one"
-            tvStep1Status.text = "Step one"
-            tvStep2Status.text = "Check to enable key of love"
-        }else if(!enabled && selected){
-            btnEnable.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
-            btnSelect.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
-            btnEnabledimg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
-            btnSelectimg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
-            btnEnabledText.setTextColor(Color.parseColor("#FFFFFF"))
-            btnSelectText.setTextColor(Color.parseColor("#FFFFFF"))
-            tvStep1Status.text = "Step one"
-            tvStep2Status.text = "Check to enable key of love"
-        }else if(enabled && !selected){
-            btnEnable.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
-            btnSelect.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
-            btnEnabledimg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
-            btnSelectimg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
-            btnEnabledText.setTextColor(Color.parseColor("#A1A1A1"))
-            btnSelectText.setTextColor(Color.parseColor("#FFFFFF"))
-            tvStep1Status.text = "Step two"
-            tvStep2Status.text = "Select key of love as your default input method"
-        }else if(enabled && selected){
-            btnEnable.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
-            btnSelect.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
-            btnEnabledimg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
-            btnSelectimg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
-            btnEnabledText.setTextColor(Color.parseColor("#A1A1A1"))
-            btnSelectText.setTextColor(Color.parseColor("#A1A1A1"))
-            tvStep1Status.text = "Completed"
-            tvStep2Status.text = "You have completed the relevant Settings"
+        if (!enabled && !selected) {
+            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
+            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
+            enableText.setTextColor(Color.parseColor("#FFFFFF"))
+            selectText.setTextColor(Color.parseColor("#FFFFFF"))
+            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
+            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
+            step1.text = "Step one"
+            step2.text = "Check to enable key of love"
+        } else if (!enabled && selected) {
+            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
+            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
+            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
+            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
+            enableText.setTextColor(Color.parseColor("#FFFFFF"))
+            selectText.setTextColor(Color.parseColor("#FFFFFF"))
+            step1.text = "Step one"
+            step2.text = "Check to enable key of love"
+        } else if (enabled && !selected) {
+            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
+            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_unfinished)
+            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
+            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_unfinished_img)
+            enableText.setTextColor(Color.parseColor("#A1A1A1"))
+            selectText.setTextColor(Color.parseColor("#FFFFFF"))
+            step1.text = "Step two"
+            step2.text = "Select key of love as your default input method"
+        } else if (enabled && selected) {
+            enableLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
+            selectLayout.background = getDrawable(R.drawable.ime_guide_activity_btn_completed)
+            enableImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
+            selectImg.setImageResource(R.drawable.ime_guide_activity_btn_completed_img)
+            enableText.setTextColor(Color.parseColor("#A1A1A1"))
+            selectText.setTextColor(Color.parseColor("#A1A1A1"))
+            step1.text = "Completed"
+            step2.text = "You have completed the relevant Settings"
             Toast.makeText(this, "The input method is all set!", Toast.LENGTH_SHORT).show()
-            startActivity(Intent(this, GuideActivity::class.java))
+            try {
+                startActivity(Intent(this, GuideActivity::class.java))
+            } catch (e: Exception) {
+                Log.e(TAG, "启动 GuideActivity 失败，检查是否在 Manifest 中声明", e)
+            }
             finish()
         }
     }
 
-        /** 是否启用了本输入法 */
-        private fun isImeEnabled(): Boolean {
-            val enabledImes = Settings.Secure.getString(
-                contentResolver,
-                Settings.Secure.ENABLED_INPUT_METHODS
-            ) ?: return false
-
-            // 用真正的类，而不是手写字符串
-            val myImeComponent = ComponentName(this, MyInputMethodService::class.java)
-            // 系统存的是 flattenToString() 的格式
-            val myImeId = myImeComponent.flattenToString()
-
-            // enabledImes 是一个用 ":" 分隔的列表
-            return enabledImes.split(':').contains(myImeId)
+    /** 是否启用了本输入法 */
+    private fun isImeEnabled(): Boolean {
+        return try {
+            val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+            val myComponent = ComponentName(this, MyInputMethodService::class.java)
+    
+            val result = imm.enabledInputMethodList.any { imeInfo ->
+                imeInfo.packageName == myComponent.packageName &&
+                        imeInfo.serviceName == myComponent.className
+            }
+    
+            Log.d(TAG, "isImeEnabled = $result")
+            result
+        } catch (e: Exception) {
+            Log.e(TAG, "isImeEnabled 出错", e)
+            false
         }
+    }
 
-        /** 是否已切换为当前输入法 */
-        private fun isImeSelected(): Boolean {
-            val currentIme = Settings.Secure.getString(
+    /** 是否已切换为当前输入法 */
+    private fun isImeSelected(): Boolean {
+        return try {
+            val imm = getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+            val myComponent = ComponentName(this, MyInputMethodService::class.java)
+    
+            val currentImeId = Settings.Secure.getString(
                 contentResolver,
                 Settings.Secure.DEFAULT_INPUT_METHOD
             ) ?: return false
-
-            val myImeComponent = ComponentName(this, MyInputMethodService::class.java)
-            val myImeId = myImeComponent.flattenToString()
-
-            // 直接用同一种格式比对
-            return currentIme == myImeId
+    
+            Log.d(TAG, "DEFAULT_INPUT_METHOD = $currentImeId")
+    
+            // 找到“当前默认 IME”对应的 InputMethodInfo
+            val currentImeInfo = imm.enabledInputMethodList.firstOrNull { imeInfo ->
+                imeInfo.id == currentImeId
+            }
+    
+            if (currentImeInfo == null) {
+                Log.d(TAG, "currentImeInfo == null")
+                return false
+            }
+    
+            val isMine = currentImeInfo.packageName == myComponent.packageName &&
+                    currentImeInfo.serviceName == myComponent.className
+    
+            Log.d(TAG, "isImeSelected = $isMine")
+            isMine
+        } catch (e: Exception) {
+            Log.e(TAG, "isImeSelected 出错", e)
+            false
         }
-
+    }    
 }