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。
