1.先说一下网上搜到的通用玩法 实测可用就是看着不简洁，当然获取的信息还是很全的
private String doStartApplicationWithPackageName(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 = mContext.getPackageManager().getPackageInfo(packagename, 0);
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
if (packageinfo == null) {
return null;
}
// 创建一个类别为CATEGORY_LAUNCHER的该包名的Intent
Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);
resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);
resolveIntent.setPackage(packageinfo.packageName);
// 通过getPackageManager()的queryIntentActivities方法遍历
List<ResolveInfo> resolveinfoList = mContext.getPackageManager()
.queryIntentActivities(resolveIntent, 0);
for (ResolveInfo resolveInfo : resolveinfoList) {
Log.d(TAG, "resolveInfo:" + resolveInfo);
}
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;
return className;
}
return null;
}
2.ComponentName 可以启动其他应用的Activity、Service,其中包含对应组件的包名全类名
ComponentName chatActivity =new ComponentName("com.npf.chat", "com.npf.chat.ui.ChatActivity");
Intent intent =new Intent();
intent.setComponent(chatActivity);
startActivity(intent);
resolveActivity 用于启动Activity前判断对应Activity是否存在的
结合起来
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setPackage(getPackageName());//pkg为包名
ComponentName componentName = intent.resolveActivity(getPackageManager());
Log.d("MainActivity", "componentName:" + componentName);
打印截图如下
2018-03-28_152029.png
ok，基本是妥了，说一下注意事项，此处获取方法就类似Intent的隐式跳转，基本隐式跳转能ok获取到的全类名也就妥妥的，众所周知的Intent跳转会默认添加
intent.addCategory(Intent.CATEGORY_DEFAULT)
同理，此处Manifest对应的Activity如果没有添加
<category android:name="android.intent.category.DEFAULT"/>
同样的代码打印如下
2018-03-28_152743.png
此时隐式跳转直接崩溃报错
Caused by: android.content.ActivityNotFoundException: No Activity found to handle Intent { act=aa pkg=com.lei.simpletest }
Intent launchIntentForPackage = getPackageManager().getLaunchIntentForPackage(getPackageName());
ComponentName component = launchIntentForPackage.getComponent();
Log.d("MainActivity", "component:" + component);
MainActivity: component:ComponentInfo{com.lei.simpletest/com.lei.simpletest.MainActivity}
特此记录...
