Android 分享控件的实现代码

如今很多应用都提供向外分享信息的功能，在进行分享操作时，一般是从屏幕底部弹出所有具备分享功能的应用列表，再由用户进行选择

现在我就来模仿实现这种效果，不仅使分享控件从屏幕底部弹出，还要使分享控件能够上下拖动，这就需要使用到 design 包提供的 BottomSheetDialog 控件了

首先，声明 BottomSheetDialog 对话框的主布局 dialog_bottom_sheet.xml

当中，RecyclerView 用于展示提供分享功能的应用列表

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingBottom="14dp"
  android:orientation="vertical">

  <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="14dp"
    android:text="进一步的说明 -> leavesC"
    android:textAppearance="@style/TextAppearance.AppCompat"
    android:textSize="16sp"/>

  <View
    android:layout_width="match_parent"
    android:layout_height="0.6dp"
    android:background="#ddd"/>

  <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="12dp"
    android:paddingStart="14dp"
    android:text="分享文本信息到..."
    android:textAppearance="@style/TextAppearance.AppCompat"
    android:textSize="14sp"/>

  <android.support.v7.widget.RecyclerView
    android:id="@+id/rv_appList"
    android:layout_width="match_parent"
    android:layout_height="match_parent"/>

</LinearLayout>

RecyclerView 单个子项使用的布局 item_app.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:paddingBottom="8dp"
  android:paddingLeft="16dp"
  android:paddingRight="16dp"
  android:paddingTop="8dp">

  <ImageView
    android:id="@+id/iv_appIcon"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:scaleType="centerCrop"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    tools:src="@mipmap/ic_launcher"/>

  <TextView
    android:id="@+id/tv_appName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="3dp"
    android:ellipsize="end"
    android:maxLength="6"
    android:textSize="12sp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@id/iv_appIcon"
    tools:text="之乎者也"/>

</android.support.constraint.ConstraintLayout>

RecyclerView 配套使用的 Adapter ： AppShareAdapter

/**
 * 作者：叶应是叶
 * 时间：2018/3/28 20:30
 * 描述：https://github.com/leavesC
 */
public class AppShareAdapter extends RecyclerView.Adapter<AppShareAdapter.ViewHolder> {
  public interface OnClickListener {
    void onClick(int position);
  }
  public interface OnLongClickListener {
    void onLongClick(int position);
  }

  private List<App> appList;
  private LayoutInflater layoutInflater;
  private OnClickListener clickListener;
  private OnLongClickListener longClickListener;
  AppShareAdapter(Context context, List<App> appList) {
    this.layoutInflater = LayoutInflater.from(context);
    this.appList = appList;
  }

  @Override
  public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = layoutInflater.inflate(R.layout.item_app, parent, false);
    return new AppShareAdapter.ViewHolder(view);
  }

  @Override
  public void onBindViewHolder(final ViewHolder holder, int position) {
    holder.iv_appIcon.setBackground(appList.get(position).getAppIcon());
    holder.tv_appName.setText(appList.get(position).getAppName());
    holder.itemView.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        if (clickListener != null) {
          clickListener.onClick(holder.getAdapterPosition());
        }
      }
    });
    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {
      @Override
      public boolean onLongClick(View v) {
        if (longClickListener != null) {
          longClickListener.onLongClick(holder.getAdapterPosition());
        }
        return true;
      }
    });
  }

  @Override
  public int getItemCount() {
    return appList.size();
  }

  void setClickListener(OnClickListener clickListener) {
    this.clickListener = clickListener;
  }

  void setLongClickListener(OnLongClickListener longClickListener) {
    this.longClickListener = longClickListener;
  }

  class ViewHolder extends RecyclerView.ViewHolder {
    private ImageView iv_appIcon;
    private TextView tv_appName;
    ViewHolder(View itemView) {
      super(itemView);
      iv_appIcon = itemView.findViewById(R.id.iv_appIcon);
      tv_appName = itemView.findViewById(R.id.tv_appName);
    }
  }
}

利用 Intent 找出所有提供分享功能的应用，初始化 BottomSheetDialog 即可

/**
 * 作者：叶应是叶
 * 时间：2018/3/28 20:30
 * 描述：https://github.com/leavesC
 */
public class MainActivity extends AppCompatActivity {
  private List<App> appList;
  private BottomSheetDialog bottomSheetDialog;
  private Intent shareIntent;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    shareIntent = new Intent(Intent.ACTION_SEND);
    shareIntent.setType("text/plain");
    shareIntent.putExtra(Intent.EXTRA_TEXT, "https://github.com/leavesC");
  }
  public void originalShare(View view) {
    Intent intent = Intent.createChooser(shareIntent, "分享一段文本信息");
    if (shareIntent.resolveActivity(getPackageManager()) != null) {
      startActivity(intent);
    }
  }
  public void customizedShare(View view) {
    if (bottomSheetDialog == null) {
      bottomSheetDialog = new BottomSheetDialog(this);
      bottomSheetDialog.setContentView(R.layout.dialog_bottom_sheet);
      initBottomDialog();
    }
    bottomSheetDialog.show();
  }

  private void initBottomDialog() {
    appList = getShareAppList(this, shareIntent);
    AppShareAdapter appShareAdapter = new AppShareAdapter(this, appList);
    appShareAdapter.setClickListener(new AppShareAdapter.OnClickListener() {
      @Override
      public void onClick(int position) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.setComponent(new ComponentName(appList.get(position).getPackageName(), appList.get(position).getMainClassName()));
        intent.setType("text/plain");
        intent.putExtra(Intent.EXTRA_TEXT, "https://github.com/leavesC");
        startActivity(intent);
      }
    });
    appShareAdapter.setLongClickListener(new AppShareAdapter.OnLongClickListener() {
      @Override
      public void onLongClick(int position) {
        Intent intent = new Intent();
        intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(Uri.parse("package:" + appList.get(position).getPackageName()));
        startActivity(intent);
      }
    });
    RecyclerView rv_appList = bottomSheetDialog.findViewById(R.id.rv_appList);
    if (rv_appList != null) {
      rv_appList.setLayoutManager(new GridLayoutManager(this, 4));
      rv_appList.setAdapter(appShareAdapter);
    }
  }

  public static List<App> getShareAppList(Context context, Intent intent) {
    List<App> appList = new ArrayList<>();
    PackageManager packageManager = context.getPackageManager();
    List<ResolveInfo> resolveInfoList = packageManager.queryIntentActivities(intent, PackageManager.COMPONENT_ENABLED_STATE_DEFAULT);
    if (resolveInfoList == null || resolveInfoList.size() == 0) {
      return null;
    } else {
      for (ResolveInfo resolveInfo : resolveInfoList) {
        App appInfo = new App(resolveInfo.loadLabel(packageManager).toString(), resolveInfo.activityInfo.packageName,
            resolveInfo.activityInfo.name, resolveInfo.loadIcon(packageManager));
        appList.add(appInfo);
      }
    }
    return appList;
  }
}

这里提供上述示例代码： ShareDialog_Demo

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