杂学（四）

1.隐式调用

	Intent intent = new Intent();
    intent.setAction("com.android.plugin.client");
    startActivity(intent);

需要添加category，否则隐式调用不能生效
	<activity android:name=".SpaceActivity">
        <intent-filter>
            <action android:name="com.android.plugin.client"></action>
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>

2.进行查询当前的activity被启动的intent的数量，能在插件化中查到插件的数量

public int getIntentAvailable(Context context, String action) {
    final PackageManager packageManager = context.getPackageManager();
    final Intent intent = new Intent(action);
    List<ResolveInfo> resolveInfo =
            packageManager.queryIntentActivities(intent,
                    PackageManager.MATCH_DEFAULT_ONLY);
    return resolveInfo.size();
}