Android(安卓)实现Activity后台运行

16lz 2021-01-24

此方法其实不是主要是屏蔽Keycode_Back，让它不结束（finish()）Activity，直接显示HOME界面。

Java代码

PackageManagerpm=getPackageManager();
ResolveInfohomeInfo=pm.resolveActivity(newIntent(Intent.ACTION_MAIN)
.addCategory(Intent.CATEGORY_HOME),0);

Java代码

publicbooleanonKeyDown(intkeyCode,KeyEventevent){
if(keyCode==KeyEvent.KEYCODE_BACK){
ActivityInfoai=homeInfo.activityInfo;
IntentstartIntent=newIntent(Intent.ACTION_MAIN);
startIntent.addCategory(Intent.CATEGORY_LAUNCHER);
startIntent.setComponent(newComponentName(ai.packageName,
ai.name));
startActivitySafely(startIntent);
returntrue;
}else
returnsuper.onKeyDown(keyCode,event);
}

Java代码

voidstartActivitySafely(Intentintent){
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
try{
startActivity(intent);
}catch(ActivityNotFoundExceptione){
Toast.makeText(this,R.string.unabletoopensoftware,
Toast.LENGTH_SHORT).show();
}catch(SecurityExceptione){
Toast.makeText(this,R.string.unabletoopensoftware,
Toast.LENGTH_SHORT).show();
Log
.e(
TAG,
"Launcherdoesnothavethepermissiontolaunch"
+intent
+".MakesuretocreateaMAINintent-filterforthecorrespondingactivity"
+"orusetheexportedattributeforthisactivity.",
e);
}
}

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