方法一
private voiddoStartApplicationWithPackageName(String packagename) {
//通过包名获取此APP详细信息，包括Activities、services、versioncode、name等等
PackageInfo packageinfo =null;
try{
packageinfo = getPackageManager().getPackageInfo(packagename,0);
}catch(PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if(packageinfo ==null) {
return;
}
//创建一个类别为CATEGORY_LAUNCHER的该包名的Intent
Intent resolveIntent =newIntent(Intent.ACTION_MAIN, null);
resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resolveIntent.setPackage(packageinfo.packageName);
//通过getPackageManager()的queryIntentActivities方法遍历
List resolveinfoList = getPackageManager()
.queryIntentActivities(resolveIntent,0);
ResolveInfo resolveinfo = resolveinfoList.iterator().next();
if(resolveinfo !=null) {
// packagename =参数packname
String packageName = resolveinfo.activityInfo.packageName;
//这个就是我们要找的该APP的LAUNCHER的Activity[组织形式：packagename.mainActivityname]
String className = resolveinfo.activityInfo.name;
// LAUNCHER Intent
Intent intent =newIntent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
//设置ComponentName参数1:packagename参数2:MainActivity路径
ComponentName cn =newComponentName(packageName,className);
intent.setComponent(cn);
startActivity(intent);
}
}
方法二
直接通过Intent获取指定包名启动App
// 通过包名获取要跳转的app，创建intent对象
Intent intent = getPackageManager().getLaunchIntentForPackage("com.tencent.mobileqq");
// 这里如果intent为空，就说名没有安装要跳转的应用嘛
if (intent != null) {
startActivity(intent);
} else {
// 没有安装要跳转的app应用，提醒一下
}
