我有这段代码可以打开android的计算器(默认情况下)。 我想做的是输入数字和计算,例如: 当应用程序打开时,出现:sin(180)
我不知道我是否要解释自己
public void ac(){
ArrayList<HashMap<String,Object>> items = new ArrayList<HashMap<String,Object>>();
final PackageManager pm = getPackageManager();
List<PackageInfo> packs = pm.getInstalledPackages(0);
for (PackageInfo pi : packs) {
if( pi.packageName.toString().toLowerCase().contains("calcul")){
HashMap<String, Object> map = new HashMap<String, Object>();
map.put("appName", pi.applicationInfo.loadLabel(pm));
map.put("packageName", pi.packageName);
items.add(map);
}
}
if(items.size()>=1){
String packageName = (String) items.get(0).get("packageName");
Intent i = pm.getLaunchIntentForPackage(packageName);
if (i != null)
startActivity(i);
}
else{
// Application not found
Toast.makeText(CMF_Home.this, "You don't have an calculator app", Toast.LENGTH_SHORT).show();
}
Intent intent = new Intent();
intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_APP_CALCULATOR);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
}