Android 通过系统API 实现分享功能

一. 通过系统API 实现分享

1、 应用如何对外有分享功能的？

如果应用的AndroidManifest.xml 中配有ACTION_SEND 属性，那就证明该应用可以供第三方应用调用进行分享。

2、如何获取含有该属性的应用列表？

通过向系统发送指定内容的隐式意图， 来获取含有该action 的应用。通过PackageManager中queryIntentActivities() 获取应用含有该意图的应用列表。

二.代码实现

1、获取分享列表

public List<AppInfoVo> getShareApps() {
        List<AppInfoVo> appInfoVos = new ArrayList<AppInfoVo>();
        if (mWeak == null || mWeak.get() == null) {
            return appInfoVos;
        }
        PackageManager packageManager = mWeak.get().getPackageManager();
        List<ResolveInfo> resolveInfoList = new ArrayList<ResolveInfo>();
        Intent intent = new Intent(Intent.ACTION_SEND, null);
        intent.addCategory(Intent.CATEGORY_DEFAULT);
        intent.setType("*/*");
        PackageManager pManager = mWeak.get().getPackageManager();
        resolveInfoList = pManager.queryIntentActivities(intent, 0);
        for (int i = 0; i < resolveInfoList.size(); i++) {
            AppInfoVo appInfoVo = new AppInfoVo();
            ResolveInfo resolveInfo = resolveInfoList.get(i);
            appInfoVo.setAppName(resolveInfo.loadLabel(packageManager).toString());
            appInfoVo.setIcon(resolveInfo.loadIcon(packageManager));
            appInfoVo.setPackageName(resolveInfo.activityInfo.packageName);
            appInfoVo.setLauncherName(resolveInfo.activityInfo.name);
            appInfoVos.add(appInfoVo);
        }
        return appInfoVos;
    }

public class AppInfoVo {
  
   private Drawable icon;
    private String appName;
    private String packageName;
    private String launcherName;
}

ResolveInfo这个类是通过解析与IntentFilter相对应的intent得到的信息。它部分地对应于从AndroidManifest.xml的< intent>标签收集到的信息。得到List列表后转成自己建的AppInfoVo类，方便后面使用

2、初始化弹窗

public class SharePopupWindow extends PopupWindow {
    public static final int MASK_COLOR = Color.argb(0x00, 0, 0, 0);
    private View mMenuView;
    private GridView mGridView;
    private TextView mTextViewClose;
    private AppInfoAdapter mAdapter;

    private List<AppInfoVo> mAppInfoList;
    private List<AppInfoVo> mMainAppsList;
    private List<AppInfoVo> mShowAppsList = new ArrayList<>();
    private OnShareItemClickListener mOnShareItemClickListener;

    private Activity mActivity;
    public View mRootView;

    public SharePopupWindow(Activity activity, final List<AppInfoVo> mAppInfoList, List<AppInfoVo> mainAppsList) {
        super(LayoutInflater.from(activity).inflate(R.layout.pop_device_share, null, false), ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, true);
        mRootView = getContentView();
        this.mAppInfoList = mAppInfoList;
        this.mMainAppsList = mainAppsList;
        this.mActivity = activity;

        mGridView = (GridView) mRootView.findViewById(R.id.grid_app);
        mTextViewClose = (TextView) mRootView.findViewById(R.id.tv_close);

        mShowAppsList.clear();
        mShowAppsList.addAll(mainAppsList);

        //如果主要app为空直接设置全部可分享设备
        if (mainAppsList.isEmpty() || mainAppsList.size() == 1) {
            mShowAppsList.addAll(mAppInfoList);
        }
        mAdapter = new AppInfoAdapter(mActivity, mShowAppsList);
        mGridView.setAdapter(mAdapter);
        changeGridView(mActivity);

        mGridView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
                AppInfoVo mAppInfoVo = mShowAppsList.get(position);
                if (TextUtils.isEmpty(mAppInfoVo.getPackageName())) { //点击更多
                    mShowAppsList.clear();
                    mShowAppsList.addAll(mAppInfoList);
                    mAdapter.notifyDataSetChanged();
                    changeGridView(mActivity);
                } else { //点击app
                    if (mOnShareItemClickListener != null) {
                        mOnShareItemClickListener.onShareItemClick(position, mAppInfoVo);
                    }
                }
            }
        });

        mTextViewClose.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View arg0) {
                dismiss();
            }
        });
    }

    /**
     * 将GridView改成单行横向布局
     */
    private void changeGridView(Context context) {
        if (mShowAppsList.size() != mAppInfoList.size()) {
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(getScreenWidthDimension(mActivity), LinearLayout.LayoutParams.MATCH_PARENT);
            mGridView.setLayoutParams(params);
            return;
        }
        // 1.item宽度
        int itemWidth = dp2px(100, context);
        // 2.item之间的间隔
        int itemPaddingH = dp2px(1, context);
        int size = mShowAppsList.size();
        // 3.计算GridView宽度
        int gridviewWidth = size / 2 * (itemWidth + itemPaddingH);
        // 4.设置mGridView
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(gridviewWidth, LinearLayout.LayoutParams.MATCH_PARENT);
        mGridView.setLayoutParams(params);
        mGridView.setColumnWidth(itemWidth);
        mGridView.setHorizontalSpacing(itemPaddingH);
        mGridView.setStretchMode(GridView.NO_STRETCH);
        mGridView.setNumColumns(size / 2);
    }
 
    public interface OnShareItemClickListener {
        void onShareItemClick(int position, AppInfoVo mAppInfoVo);
    }

    public void setOnShareItemClickListener(OnShareItemClickListener mOnShareItemClickListener) {
        this.mOnShareItemClickListener = mOnShareItemClickListener;
    }
}

• 效果图

  
  分享.gif

三.项目地址