如今很多應(yīng)用都提供向外分享信息的功能，在進(jìn)行分享操作時(shí)，一般是從屏幕底部彈出所有具備分享功能的應(yīng)用列表，再由用戶進(jìn)行選擇

現(xiàn)在我就來模仿實(shí)現(xiàn)這種效果，不僅使分享控件從屏幕底部彈出，還要使分享控件能夠上下拖動(dòng)，這就需要使用到 design 包提供的 BottomSheetDialog 控件了

首先，聲明 BottomSheetDialog 對話框的主布局 dialog_bottom_sheet.xml 當(dāng)中，RecyclerView 用于展示提供分享功能的應(yīng)用列表

<?xml version="1.0" encoding="utf-8"?> <LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:paddingBottom="14dp"android:orientation="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:padding="14dp"android:text="進(jìn)一步的說明 -> leavesC"android:textAppearance="@style/TextAppearance.AppCompat"android:textSize="16sp"/><Viewandroid:layout_width="match_parent"android:layout_height="0.6dp"android:background="#ddd"/><TextViewandroid: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.RecyclerViewandroid:id="@+id/rv_appList"android:layout_width="match_parent"android:layout_height="match_parent"/></LinearLayout> 復(fù)制代碼

RecyclerView 單個(gè)子項(xiàng)使用的布局 item_app.xml

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayoutxmlns: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"><ImageViewandroid: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"/><TextViewandroid: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> 復(fù)制代碼

RecyclerView 配套使用的 Adapter ：AppShareAdapter

/*** 作者：葉應(yīng)是葉* 時(shí)間：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;}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {View view = layoutInflater.inflate(R.layout.item_app, parent, false);return new AppShareAdapter.ViewHolder(view);}@Overridepublic 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() {@Overridepublic void onClick(View v) {if (clickListener != null) {clickListener.onClick(holder.getAdapterPosition());}}});holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {@Overridepublic boolean onLongClick(View v) {if (longClickListener != null) {longClickListener.onLongClick(holder.getAdapterPosition());}return true;}});}@Overridepublic 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);}}}復(fù)制代碼

利用 Intent 找出所有提供分享功能的應(yīng)用，初始化 BottomSheetDialog 即可

/*** 作者：葉應(yīng)是葉* 時(shí)間：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;@Overrideprotected 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() {@Overridepublic 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() {@Overridepublic 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;}} 復(fù)制代碼

這里提供上述示例代碼：ShareDialog_Demo

歡迎關(guān)注我的 GitHub 賬號：leavesC

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