为AppInventor2开发拓展(Extension)

package cn.fun123.Clipboard;

import android.content.Context;
import android.util.Log;
import android.widget.Toast;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.net.Uri;

import com.google.appinventor.components.annotations.DesignerComponent;
import com.google.appinventor.components.annotations.DesignerProperty;
import com.google.appinventor.components.annotations.PropertyCategory;
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.annotations.SimpleProperty;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.common.PropertyTypeConstants;
import com.google.appinventor.components.runtime.*;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;

@DesignerComponent(version = Clipboard.VERSION,
    description = "App Inventor 2 剪贴板管理拓展。Powered by 中文网(www.fun123.cn)",
    helpUrl = "https://www.fun123.cn/reference/extensions/",       //点“帮助”跳转的页面
    category = ComponentCategory.EXTENSION,
    nonVisible = true,                                             //非可视拓展
    iconName = "aiwebres/small-icon.png")                          //拓展的图标，可以使用相对路径
@SimpleObject(external = true)
@SuppressWarnings("deprecation")
@UsesPermissions(permissionNames = "android.permission.INTERNET")  //拓展需要请求的权限，这里仅展示用
@UsesPermissions({INTERNET})                                       //简洁写法，等同于上面一行
@UsesLibraries(libraries = "okhttp-3.12.13.jar, xxx.jar")          //依赖第三方jar库的，多个英文逗号分隔

public class Clipboard extends AndroidNonvisibleComponent implements Component {

  public static final int VERSION = 1;
  private ComponentContainer container;
  private Context context;
  private static final String LOG_TAG = "CB";
  private boolean suppressToast;


  public Clipboard(ComponentContainer container) {
    super(container.$form());
    this.container = container;
    context = (Context) container.$context();
    Log.d(LOG_TAG, "Clipboard Created");
  }


  @SimpleProperty(category = PropertyCategory.BEHAVIOR,
      description = "操作成功后不显示提示信息，默认 false。")
  public boolean SuppressToast() {
    return suppressToast;
  }


  @DesignerProperty(editorType = PropertyTypeConstants.PROPERTY_TYPE_BOOLEAN,
      defaultValue = "false")
  @SimpleProperty
  public void SuppressToast(boolean suppressToast) {
    this.suppressToast = suppressToast;
  }


  @SimpleFunction(description = "拷贝文本至剪贴板，如果 SuppressToast 是 true，则拷贝完成后不会显示'文本已拷贝'的提示信息。")
  public void Copy(String text) {
    try {
      //演示用，代码省略...
      Log.d(LOG_TAG, "文本已拷贝: " + text);
    } catch (Exception e) {
      Log.e(LOG_TAG, e.getMessage(), e);
    }
  }

  @SimpleFunction(description = "从剪贴板粘贴文本，如果 SuppressToast 是 true，则粘贴完成后不会显示'文本已粘贴'的提示信息。")
  public String Paste() {
    //演示用，代码省略...
    Log.d(LOG_TAG, "文本已粘贴！");
    return "";
  }
}