Android：如何从我们的应用程序启动其他应用程序的特定活动？

Question

如果我想从我的应用程序启动其他应用程序，那么我可以编写以下代码。

Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");
startActivity(LaunchIntent);

但在我的场景中，我不想打开其他应用程序的启动器Activity ，我想打开其他特定的Activity 。

有人能帮助我吗？

Answer 1

我想打开其他特定的Activity

要从包而不是启动器启动其他Activity，请使用PackageInfo.activities来解决在AndroidManifest.xml声明的所有活动：

PackageManager pm = getPackageManager();
PackageInfo packageInfo = pm.getPackageInfo("com.package.address", 0);
ActivityInfo[] activitiesInfos = packageInfo.activities;
ActivityInfo activityToLaunch=activitiesInfos[0]; //<< activity which want to start

// Create ComponentName object using packageName and activity name
ComponentName compName=new ComponentName(
                                     activityToLaunch.applicationInfo.packageName,
                                     activityToLaunch.name);
Intent intent=new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setComponent(compName);
startActivity(intent);

Answer 2

private static final String _PACKAGE_NAME = "app package name which you want to open";
private static final String _CLASS_NAME = _PACKAGE_NAME + ".activity class which you want to access";

然后调用它

    try {
                Intent intent = new Intent();
                intent.setClassName(_PACKAGE_NAME, _CLASS_NAME);
                // Set your data in my case i have url 
                intent.setData(Uri.parse(playlistUrl));
                // If "package" extra is set, app will be able to show your app name as a title
                intent.putExtra("package", getPackageName());
               startActivity(intent);

            } catch (ActivityNotFoundException e) {
                // app is not installed, let's ask the user to install it.
               AppNotFoundDialog();
            }