feat: 发布4×4候选与Android手表应用内键盘组件

android/host/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application android:label="键盘接入参考" android:theme="@android:style/Theme.Material.Light.NoActionBar" android:allowBackup="false">
+        <activity android:name=".HostActivity" android:exported="true" android:windowSoftInputMode="stateAlwaysHidden" />
+    </application>
+</manifest>

android/host/src/main/java/com/sydxky/crabinput/host/HostActivity.java

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+package com.sydxky.crabinput.host;
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.Gravity;
+import android.widget.EditText;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+import com.sydxky.crabinput.CrabKeyboard;
+
+/** Separate application demonstrates the public library API, not a system IME. */
+public final class HostActivity extends Activity {
+    private CrabKeyboard.Binding binding;
+    @Override public void onCreate(Bundle saved){
+        super.onCreate(saved);LinearLayout layout=new LinearLayout(this);layout.setOrientation(LinearLayout.VERTICAL);layout.setGravity(Gravity.CENTER);layout.setPadding(55,45,55,45);
+        TextView title=new TextView(this);title.setText("独立应用接入示例");title.setTextSize(13);layout.addView(title);
+        EditText editor=new EditText(this);editor.setContentDescription("fixture_editor");editor.setHint("点击输入");layout.addView(editor,new LinearLayout.LayoutParams(-1,-2));
+        layout.setFocusableInTouchMode(true);layout.requestFocus();setContentView(layout);binding=CrabKeyboard.attach(this,editor);
+    }
+    @Override protected void onDestroy(){if(binding!=null)binding.close();super.onDestroy();}
+}