Android 使用SharedReference保存后在onResume上获取错误的变量值
我正试图在Android 使用SharedReference保存后在onResume上获取错误的变量值,android,sharedpreferences,oncreate,onresume,Android,Sharedpreferences,Oncreate,Onresume,我正试图在onPause中保存布尔计数,并使用SharedReference在onResume中检索该计数。但是当我第一次启动应用程序时,我得到了false值count。 我不知道为什么。我搜索了我的问题,找不到匹配的答案 以下是我的一项活动的代码: public class ListView extends AppCompatActivity { private DatabaseReference mDatabase; private ArrayList<String&g
onPause
中保存布尔计数,并使用SharedReference
在onResume
中检索该计数。但是当我第一次启动应用程序时,我得到了false
值count。
我不知道为什么。我搜索了我的问题,找不到匹配的答案
以下是我的一项活动的代码:
public class ListView extends AppCompatActivity {
private DatabaseReference mDatabase;
private ArrayList<String> url= new ArrayList<>();
private ArrayList<String> listitems = new ArrayList<>();
private ArrayAdapter mAdapter;
private android.widget.ListView listView;
private AlertDialog.Builder builder;
private int posi;
private boolean count =true;
BroadcastReceiver onComplete;
SharedPreferences sharedPreferences;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list_view);
Log.d("count onCreate",String.valueOf(count));
sharedPreferences = getSharedPreferences("Count",0);
builder = new AlertDialog.Builder(ListView.this);
final View coordinatorLayout = findViewById(android.R.id.content);
Intent intent = getIntent();
final String uri=intent.getStringExtra("uri");
final ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
mAdapter = new CustomAdapter(this,listitems);
listView = (android.widget.ListView)findViewById(R.id.listview);
mDatabase = FirebaseDatabase.getInstance().getReference().child(uri);
mDatabase.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
String key = dataSnapshot.getKey();
String value= dataSnapshot.getValue(String.class);
listitems.add(0,key);
url.add(0,value);
listView.smoothScrollToPosition(0);
mAdapter.notifyDataSetChanged();
listView.setAdapter(mAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
if ((cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState() == NetworkInfo.State.CONNECTED) ||
(cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState() == NetworkInfo.State.CONNECTED)) {
builder.setMessage("Do You Want To Download "+listitems.get(position)+" "+uri+ " ?");
builder.setTitle(R.string.confirm);
builder.setIcon(R.drawable.pdf);
builder.setPositiveButton("Confirm", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
posi = position;
Intent intent1 = new Intent(ListView.this, downloadService.class);
intent1.putExtra("uri", url.get(position));
startService(intent1);
Snackbar sb = Snackbar.make(coordinatorLayout, "Downloading in Background, See Notification", Snackbar.LENGTH_SHORT);
View sbView = sb.getView();
sbView.setBackgroundColor(getResources().getColor(R.color.material_orange));
sb.show(); }
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
AlertDialog alert1 = builder.create();
alert1.show();
}
else {
final View coordinatorLayout = findViewById(android.R.id.content);
Snackbar sb = Snackbar.make(coordinatorLayout, "No Internet Connection..!", Snackbar.LENGTH_SHORT);
View sbView = sb.getView();
sbView.setBackgroundColor(getResources().getColor(R.color.material_orange));
sb.show();
}
}
});
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
Toast.makeText(getApplicationContext(),"Something Went Wrong :(" ,Toast.LENGTH_SHORT).show();
}
});
onComplete = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
AlertDialog.Builder builder = new AlertDialog.Builder(ListView.this);
builder.setTitle("Download Completed");
builder.setMessage("Do You Want To Open "+listitems.get(posi)+" "+uri+ " ?");
builder.setIcon(R.drawable.pdf);
builder.setNegativeButton("Later", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
builder.setPositiveButton("Open", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
Intent inten = new Intent(ListView.this,onDownload.class);
inten.putExtra("uri",url.get(posi));
startService(inten);
}
});
AlertDialog alert = builder.create();
alert.show();
}
};
}
@Override
protected void onPause() {
super.onPause();
unregisterReceiver(onComplete);
Log.d("count onPause",String.valueOf(count));
sharedPreferences.edit().putBoolean("count",count).apply();
}
@Override
protected void onResume() {
super.onResume();
registerReceiver(onComplete, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));
count =sharedPreferences.getBoolean("count",true);
Log.d("count onResume",String.valueOf(count));
if (count){
count=false;
Toast.makeText(getApplicationContext(),"Loading...",Toast.LENGTH_SHORT).show();
}
}
}
公共类ListView扩展了AppCompative活动{
私有数据库参考数据库;
私有ArrayList url=新ArrayList();
private ArrayList listitems=new ArrayList();
私人ArrayaAdapter mAdapter;
私有android.widget.ListView ListView;
私有AlertDialog.Builder;
私人int posi;
私有布尔计数=真;
广播接收机未完成;
SharedReferences SharedReferences;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity\u list\u视图);
Log.d(“countoncreate”,String.valueOf(count));
SharedReferences=GetSharedReferences(“计数”,0);
builder=newalertdialog.builder(ListView.this);
最终视图coordinatorLayout=findViewById(android.R.id.content);
Intent=getIntent();
最终字符串uri=intent.getStringExtra(“uri”);
最终ConnectivityManager cm=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_服务);
mAdapter=新的CustomAdapter(此为listitems);
listView=(android.widget.listView)findViewById(R.id.listView);
mDatabase=FirebaseDatabase.getInstance().getReference().child(uri);
mDatabase.addChildEventListener(新的ChildEventListener(){
@凌驾
公共void onChildaded(@NonNull DataSnapshot DataSnapshot,@null字符串s){
String key=dataSnapshot.getKey();
String value=dataSnapshot.getValue(String.class);
添加(0,键);
添加(0,值);
listView.smoothScrollToPosition(0);
mAdapter.notifyDataSetChanged();
setAdapter(mAdapter);
setOnItemClickListener(新的AdapterView.OnItemClickListener(){
@凌驾
public void onItemClick(AdapterView父对象、视图、最终整型位置、长id){
if((cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState()==NetworkInfo.State.CONNECTED)||
(cm.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState()==NetworkInfo.State.CONNECTED)){
setMessage(“是否要下载”+listitems.get(position)+“+uri+”?”;
builder.setTitle(R.string.confirm);
setIcon(R.drawable.pdf);
setPositiveButton(“确认”,新的DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
dialog.dismise();
posi=位置;
Intent intent1=新的Intent(ListView.this,downloadService.class);
intent1.putExtra(“uri”,url.get(position));
startService(intent1);
Snackbar sb=Snackbar.make(协调布局,“在后台下载,请参阅通知”,Snackbar.LENGTH_SHORT);
View sbView=sb.getView();
sbView.setBackgroundColor(getResources().getColor(R.color.material_orange));
某人展示();}
});
setNegativeButton(“否”,新的DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
dialog.dismise();
}
});
AlertDialog alert1=builder.create();
alert1.show();
}
否则{
最终视图coordinatorLayout=findViewById(android.R.id.content);
Snackbar sb=Snackbar.make(坐标布局,“无互联网连接…”,Snackbar.LENGTH\u SHORT);
View sbView=sb.getView();
sbView.setBackgroundColor(getResources().getColor(R.color.material_orange));
某人展示;
}
}
});
}
@凌驾
public void onChildChanged(@NonNull DataSnapshot DataSnapshot,@null字符串s){
}
@凌驾
公共void onChildRemoved(@NonNull DataSnapshot DataSnapshot){
}
@凌驾
public void onChildMoved(@NonNull DataSnapshot DataSnapshot,@null字符串s){
}
@凌驾
已取消的公共void(@NonNull DatabaseError DatabaseError){
Toast.makeText(getApplicationContext(),“出现问题:(”,Toast.LENGTH_SHORT).show();
}
});
onComplete=新广播接收器(){
@凌驾
公共void onReceive(上下文、意图){
AlertDialog.Builder=新建AlertDialog.Builder(ListView.this);
builder.setTitle(“下载完成”);
setMessage(“是否要打开”+listitems.get(posi)+“+uri+”?”;
建筑商