我要做 Android 第四弹 ps（Q：如何启动其他应用的Activity？）
一、打开第三方应用 （1） Intent intent=new Intent(); //包名 包名+类名（全路径） intent.setClassName("com.jack", "com.jack.PlaneActivity"); startActivity(intent); （2） Intent intent = new Intent(); ComponentName comp = new ComponentName("com.jack","com.jack.PlaneActivity"); intent.setComponent(comp); intent.setAction("android.intent.action.MAIN"); intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent); （3）转载自https://blog.csdn.net/aaa111/article/details/41833189 public static final String APP_PACKAGE_NAME = "com.*.*";//包名 /** * 启动薄荷App * @param context */ public static void launchapp(Context context) { // 判断是否安装过App，否则去市场下载 if (isAppInstalled(context, APP_PACKAGE_NAME)) { context.startActivity(context.getPackageManager().getLaunchIntentForPackage(APP_PACKAGE_NAME)); } else { goToMarket(context, APP_PACKAGE_NAME); } } /** * 检测某个应用是否安装 * * @param context * @param packageName * @return */ public static boolean isAppInstalled(Context context, String packageName) { try { context.getPackageManager().getPackageInfo(packageName, 0); return true; } catch (NameNotFoundException e) { return false; } } /** * 去市场下载页面 */ public static void goToMarket(Context context, String packageName) { Uri uri = Uri.parse("market://details?id=" + packageName); Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri); try { context.startActivity(goToMarket); } catch (ActivityNotFoundException e) { } } 调用系统应用 （1）从 google 搜索内容 Intent intent = new Intent(); intent.setAction(Intent.ACTION_WEB_SEARCH); intent.putExtra(SearchManager.QUERY, "搜索内容") startActivity(intent); （2）浏览网页 Uri uri = Uri.parse("http://www.google.com"); Intent it = new Intent(Intent.ACTION_VIEW, uri); startActivity(it); （3）显示地图 Uri uri = Uri.parse("geo:38.899533,-77.036476"); Intent it = newIntent(Intent.Action_VIEW,uri); startActivity(it); （4）拨打电话 Uri uri =Uri.parse("tel:xxxxxx"); Intent it = new Intent(Intent.ACTION_DIAL,uri); startActivity(it); （5）发短信 //方法1： Intent it = newIntent(Intent.ACTION_VIEW); it.putExtra("sms_body", "TheSMS text"); it.setType("vnd.android-dir/mms-sms"); startActivity(it); //方法2： Uri uri =Uri.parse("smsto:0800000123"); Intent it = newIntent(Intent.ACTION_SENDTO, uri); it.putExtra("sms_body", "TheSMS text"); startActivity(it); //方法三： String body="this is sms demo"; Intent mmsintent = newIntent(Intent.ACTION_SENDTO, Uri.fromParts("smsto", number, null)); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_MESSAGE_BODY,body); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_COMPOSE_MODE,true); mmsintent.putExtra(Messaging.KEY_ACTION_SENDTO_EXIT_ON_SENT,true); startActivity(mmsintent); （6）发 Email Uri uri = Uri.parse("mailto:xxx@abc.com"); Intent it = newIntent(Intent.ACTION_SENDTO, uri); startActivity(it); Intent it = new Intent(Intent.ACTION_SEND); it.putExtra(Intent.EXTRA_EMAIL,"me@abc.com"); it.putExtra(Intent.EXTRA_TEXT, "Theemail body text"); it.setType("text/plain"); startActivity(Intent.createChooser(it,"Choose Email Client")); Intent it=new Intent(Intent.ACTION_SEND); String[] tos={"me@abc.com"}; String[]ccs={"you@abc.com"}; it.putExtra(Intent.EXTRA_EMAIL, tos); it.putExtra(Intent.EXTRA_CC, ccs); it.putExtra(Intent.EXTRA_TEXT, "Theemail body text"); it.putExtra(Intent.EXTRA_SUBJECT, "Theemail subject text"); it.setType("message/rfc822"); startActivity(Intent.createChooser(it,"Choose Email Client")); Intent it = newIntent(Intent.ACTION_SEND); it.putExtra(Intent.EXTRA_SUBJECT, "Theemail subject text"); it.putExtra(Intent.EXTRA_STREAM,"file:///sdcard/mysong.mp3"); sendIntent.setType("audio/mp3"); startActivity(Intent.createChooser(it,"Choose Email Client")); （7）播放多媒体 Intent it = new Intent(Intent.ACTION_VIEW); Uri uri =Uri.parse("file:///sdcard/song.mp3"); it.setDataAndType(uri,"audio/mp3"); startActivity(it); Uri uri =Uri.withAppendedPath(MediaStore.Audio.Media.INTERNAL_CONTENT_URI,"1"); Intent it = new Intent(Intent.ACTION_VIEW,uri); startActivity(it); （8）卸载 apk Uri uri =Uri.fromParts("package", strPackageName, null); Intent it = newIntent(Intent.ACTION_DELETE, uri); startActivity(it); （9）安装 apk Uri installUri = Uri.fromParts("package","xxx", null); returnIt = newIntent(Intent.ACTION_PACKAGE_ADDED, installUri); Intent intent = new Intent(Intent.ACTION_VIEW); intent.setDataAndType(Uri.parse("file://" + filepath),"application/vnd.android.package-archive"); startActivity(intent);// 安装 （10）显示应用详细列表 Uri uri =Uri.parse("market://details?id=app_id"); Intent it = new Intent(Intent.ACTION_VIEW,uri); startActivity(it); //where app_id is the application ID, findthe ID //by clicking on your application on Markethome //page, and notice the ID from the addressbar //发现用package name也可以 //Uri uri =Uri.parse("market://details?id=<packagename>"); （11）寻找应用 Uri uri =Uri.parse("market://search?q=pname:pkg_name"); Intent it = new Intent(Intent.ACTION_VIEW,uri); startActivity(it); //where pkg_name is the full package pathfor an application （12）打开联系人列表 //1 Intent i = new Intent(); i.setAction(Intent.ACTION_GET_CONTENT); i.setType("vnd.android.cursor.item/phone"); startActivityForResult(i, REQUEST_TEXT); //2 Uri uri = Uri.parse("content://contacts/people"); Intent it = new Intent(Intent.ACTION_PICK, uri); startActivityForResult(it, REQUEST_TEXT); 这篇文章是转载的，出处在这 https://blog.csdn.net/aaa111/article/details/41833189，随着 Android 版本的提高，权限也有很多的变化，所以可能会有一些方法不能使用，不过这里可以作为参考。也算是弥补了以下基本知识。再说了，记不得 Google 不就 OK 了是吧。 愿我们成为真实的自己。
