Android 分享控件的实现代码

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

如今很多应用都提供向外分享信息的功能，在进行分享 *** 作时，一般是从屏幕底部d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d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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