Question

我想像Intent.createChooser（intent）一样创建一些自定义的“意图选择器”。的事情。

所以我首先需要枚举所有与提供可选数据的意图相匹配的活动，例如EXTRA_TEXT或EXTRA_STREAM。请参阅代码中的注释以了解实际问题。基本上，他们是 1）返回的意图通常被枚举，但为null（不可用） 2）不采用传入的intent（构造函数）数据，因此新的intent在没有任何extras / flags / etc.的情况下启动。

public class IntentChooserDialog extends Dialog implements OnItemClickListener {

    private ListView mListView;
    private ResolveInfo[] mResolveInfos;
    private Bundle mIntentBundle;
    private Activity mActivity;

    public IntentChooserDialog(Activity activity, Intent intent, int theme) {
        super(activity, theme);
        setContentView(R.layout.dlg_intentchooser);

        mIntentBundle = intent.getExtras();
        mActivity = activity;

        mListView = (ListView) findViewById(R.id.dlg_intentchooser_list);
        mListView.setOnItemClickListener(this);

        enumerateApps(activity, intent);

    }

    private void enumerateApps(Context context, Intent intent) {
        final PackageManager packageManager = context.getPackageManager();
        final List<ResolveInfo> entries = packageManager.queryIntentActivities(intent, 0);
        mResolveInfos = entries.toArray(new ResolveInfo[] {});

        ArrayList<String> appNames = new ArrayList<String>(entries.size());

        final int entriesSize = entries.size();
        for (int i = 0; i < entriesSize; ++i) {
            // We only add an item if it's executable
            final Intent launchIntent = packageManager.getLaunchIntentForPackage(mResolveInfos[i].activityInfo.packageName);
            if (launchIntent != null) {
                final String appName = mResolveInfos[i].activityInfo.applicationInfo.loadLabel(packageManager).toString();
                appNames.add(appName);
            }
        }

        final ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, R.layout.dlg_intentchooser_list_item, appNames);
        mListView.setAdapter(adapter);
    }
rride
    public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
        final PackageManager packageManager = getContext().getPackageManager();
        final Intent intent = packageManager.getLaunchIntentForPackage(mResolveInfos[position].activityInfo.packageName);

        // intent often is still null! -> NullPointerException; but why, Im testing it when adding them into the mResolveInfo
                // I need to provide ALL information passed to the intent we get in the constructor. So things like "addFlags" and "setType" etc. must be passed too somehow!
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.putExtras(mIntentBundle); // extras are not added, as the intents are opened as if no extras were added. The "foreign" apps are just opened as if I opened them in the Launcher.

        getContext().startActivity(intent);

    }

}

在Intent中传递的构造函数中传递给Intent.createChooser的任何其他Intent都可以，所以例如：

Intent shareIntent = new Intent(Intent.ACTION_SEND);
        shareIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
        shareIntent.setType("text/plain");
        shareIntent.putExtra(Intent.EXTRA_SUBJECT, mActivity.getString(R.string.action_openin_extraSubject));
        shareIntent.putExtra(Intent.EXTRA_TEXT, mActivity.getString(R.string.action_openin_extraText));
        shareIntent.setType("image/*");
        shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://" + fileName));

 new IntentChooserDialog(this, shareIntent, 0).show();

枚举活动意图并根据需要启动

0 个答案: