Android 工具栏没有';t在创建或使用XML设置高程
我目前正在为学校创建一个安卓应用程序,但仍然希望尽我所能。一般来说,我对Android的开发和编码还很陌生。 该应用程序应该是一个股市游戏。 (顺便说一句,我是德国人,所以可能有一些德国变量) 这款应用应该与谷歌最近推出的Pixel2和Android Pie风格相似。因此,工具栏在创建时不应有阴影,但在滚动时应出现阴影,如Pixel 2的设置应用程序(如电池选项卡)。 下拉阴影在滚动时出现,到达顶部时消失,但工具栏以下拉阴影开始,尽管我在XML中将Android 工具栏没有';t在创建或使用XML设置高程,android,xml,android-toolbar,Android,Xml,Android Toolbar,我目前正在为学校创建一个安卓应用程序,但仍然希望尽我所能。一般来说,我对Android的开发和编码还很陌生。 该应用程序应该是一个股市游戏。 (顺便说一句,我是德国人,所以可能有一些德国变量) 这款应用应该与谷歌最近推出的Pixel2和Android Pie风格相似。因此,工具栏在创建时不应有阴影,但在滚动时应出现阴影,如Pixel 2的设置应用程序(如电池选项卡)。 下拉阴影在滚动时出现,到达顶部时消失,但工具栏以下拉阴影开始,尽管我在XML中将android:elevation设置为0,在o
android:elevation
设置为0,在onCreate
方法中将toolbar.setElevation(0)
。
为什么会发生这种情况?此方法适用于OnScrollChangedListener
Java代码:
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.design.widget.AppBarLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.widget.NestedScrollView;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
ArrayList<JSONObject> jObjList = new ArrayList<>();
private FloatingActionButton fab;
private TextView moneyTxt;
private TextView sharesTxt;
private TextView sumTxt;
private Toolbar toolbar;
private AppBarLayout toolbarLayout;
private RecyclerView recyclerShares;
private SharesAdapter sAdapter;
private NestedScrollView scrollMain;
private SwipeRefreshLayout refreshMain;
private float money;
private float sharesWorth;
private boolean isRefreshing;
private JSONObject jObj = new JSONObject();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = findViewById(R.id.abMain);
toolbar.setTitleTextColor(getResources().getColor(R.color.colorPrimary));
setSupportActionBar(toolbar);
fab = findViewById(R.id.fabMain);
moneyTxt = findViewById(R.id.moneyTxt);
sharesTxt = findViewById(R.id.sharesTxt);
sumTxt = findViewById(R.id.sumTxt);
toolbarLayout = findViewById(R.id.abMainLayout);
recyclerShares = findViewById(R.id.recyclerShares);
scrollMain = findViewById(R.id.scrollMain);
scrollMain.setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
refreshMain = findViewById(R.id.refreshMain);
isRefreshing = false;
try {
jObj.put("name", "BMW");
jObj.put("worth", 143.23);
jObj.put("count", 5);
jObj.put("change", -1.5);
jObjList.add(jObj);
} catch (JSONException e) {
}
sAdapter = new SharesAdapter(jObjList);
RecyclerView.LayoutManager cLayoutManager = new CustomGridLayoutManager(getApplicationContext()) {
@Override
public boolean canScrollVertically() {
return false;
}
};
recyclerShares.setLayoutManager(cLayoutManager);
recyclerShares.setItemAnimator(new DefaultItemAnimator());
recyclerShares.setAdapter(sAdapter);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, SharesActivity.class);
startActivity(intent);
}
});
toolbarLayout.setElevation(0); //TODO: Stackoverflow nach Lösung fragen
scrollMain.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
@Override
public void onScrollChanged() {
int scroll = scrollMain.getScrollY();
if (scroll == 0) {
toolbarLayout.setElevation(0);
} else {
toolbarLayout.setElevation(8);
}
}
});
refreshMain.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
refresh(MainActivity.this);
}
});
refresh(MainActivity.this);
}
private void refresh(Context context) {
isRefreshing = true;
SharedPreferences sharedPref = context.getSharedPreferences(getString(R.string.preference_file_key), Context.MODE_PRIVATE);
SharedPreferences.Editor sharedPrefEdit = sharedPref.edit();
if (sharedPref.getBoolean("isFirstRun", true)) {
sharedPrefEdit.putBoolean("isFirstRun", false);
sharedPrefEdit.putFloat(getString(R.string.moneyShared), 5000);
sharedPrefEdit.apply();
}
float shareWorth = 0;
for (int i = 0; i < jObjList.size(); i++) {
try {
shareWorth += jObjList.get(i).getDouble("worth") * jObjList.get(i).getDouble("count");
} catch (JSONException e) {
}
}
sharedPrefEdit.putFloat(getString(R.string.sharesWorthShared), shareWorth);
sharedPrefEdit.commit();
money = sharedPref.getFloat(getString(R.string.moneyShared), 0);
sharesWorth = sharedPref.getFloat(getString(R.string.sharesWorthShared), 0);
moneyTxt.setText(String.format("%.2f€", money));
sharesTxt.setText(String.format("%.2f€", sharesWorth));
sumTxt.setText(String.format("%.2f€", money + sharesWorth));
if(isRefreshing) {
isRefreshing = false;
refreshMain.setRefreshing(isRefreshing);
}
Toast.makeText(MainActivity.this, "Alles neugeladen", Toast.LENGTH_SHORT).show();
}
public void onShareClick(View v) {
Intent i = new Intent(MainActivity.this, CompanyActivity.class);
try {
i.putExtra("name", jObj.getString("name"));
i.putExtra("worth", jObj.getDouble("worth"));
} catch (JSONException e) {
i.putExtra("name", "Fehler");
i.putExtra("worth", 0);
}
startActivity(i);
}
}
导入android.content.Context;
导入android.content.Intent;
导入android.content.SharedReferences;
导入android.os.Bundle;
导入android.support.design.widget.AppBarLayout;
导入android.support.design.widget.FloatingActionButton;
导入android.support.v4.widget.NestedScrollView;
导入android.support.v4.widget.swiperFreshLayout;
导入android.support.v7.app.AppActivity;
导入android.support.v7.widget.DefaultItemAnimator;
导入android.support.v7.widget.RecyclerView;
导入android.support.v7.widget.Toolbar;
导入android.view.Menu;
导入android.view.MenuItem;
导入android.view.view;
导入android.view.ViewGroup;
导入android.view.ViewTreeObserver;
导入android.widget.ScrollView;
导入android.widget.TextView;
导入android.widget.Toast;
导入org.json.JSONException;
导入org.json.JSONObject;
导入java.util.ArrayList;
公共类MainActivity扩展了AppCompatActivity{
ArrayList jObjList=新建ArrayList();
私人浮动按钮制造厂;
私有文本视图;
私有文本视图共享文本;
私有文本视图;
专用工具栏;
专用AppBarLayout工具栏布局;
私人垃圾回收站;
私人股份制;
私有嵌套ScrollView scrollMain;
私人SwipereRefreshMain;
私人游资;
私人流通股;
私有布尔是反擦痕;
private JSONObject jObj=new JSONObject();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar=findViewById(R.id.abMain);
setTitleTextColor(getResources().getColor(R.color.colorPrimary));
设置支持操作栏(工具栏);
fab=findViewById(R.id.fabMain);
moneyTxt=findViewById(R.id.moneyTxt);
sharesTxt=findViewById(R.id.sharesTxt);
sumTxt=findViewById(R.id.sumTxt);
toolbarLayout=findViewById(R.id.abMainLayout);
recyclerShares=findViewById(R.id.recyclerShares);
scrollMain=findviewbyd(R.id.scrollMain);
scrollMain.SetDegenantFocusability(ViewGroup.FOCUS在子体之前);
refreshMain=findViewById(R.id.refreshMain);
isRefreshing=假;
试一试{
jObj.put(“名称”、“宝马”);
jObj.put(“沃思”,143.23);
jObj.put(“计数”,5);
jObj.put(“变更”,-1.5);
jObjList.add(jObj);
}捕获(JSONException e){
}
sAdapter=新共享sAdapter(作业列表);
RecycleView.LayoutManager ClayotManager=新的CustomGridLayoutManager(getApplicationContext()){
@凌驾
公共布尔值(){
返回false;
}
};
回收商。setLayoutManager(cLayoutManager);
setItemAnimator(新的DefaultItemAnimator());
回收站设置适配器(sAdapter);
fab.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
意向意向=新意向(MainActivity.this、SharesActivity.class);
星触觉(意向);
}
});
toolbarLayout.setElevation(0);//TODO:Stackoverflow nach Lösung fragen
scrollMain.getViewTreeObserver().addOnScrollChangedListener(新的ViewTreeObserver.OnScrollChangedListener(){
@凌驾
public void onScrollChanged(){
int scroll=scrollMain.getScrollY();
如果(滚动==0){
工具栏布局。设置标高(0);
}否则{
工具栏布局。设置立面图(8);
}
}
});
refreshMain.setOnRefreshListener(新的SwipeRefreshLayout.OnRefreshListener()){
@凌驾
公共void onRefresh(){
刷新(MainActivity.this);
}
});
刷新(MainActivity.this);
}
私有无效刷新(上下文){
isRefreshing=真;
SharedReferences SharedReferences=context.getSharedReferences(getString(R.string.preference\u file\u key)、context.MODE\u PRIVATE);
SharedPreferences.Editor SharedPreferEdit=sharedPref.edit();
if(sharedPref.getBoolean(“isFirstRun”,true)){
putBoolean(“isFirstRun”,false);
SharedPreEdit.putFloat(getString(R.string.moneyShared),5000);
SharedPreEdit.apply();
}
浮动股票价值=0;
对于(int i=0;i<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBackground"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:id="@+id/abMainLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="0dp">
<android.support.v7.widget.Toolbar
android:id="@+id/abMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorBackgroundAccent"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</android.support.design.widget.AppBarLayout>
<android.support.design.widget.FloatingActionButton
android:id="@+id/fabMain"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="16dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:backgroundTint="@color/colorBackground"
android:src="@drawable/ic_note_add"
app:borderWidth="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/refreshMain"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/abMainLayout">
<android.support.v4.widget.NestedScrollView
android:id="@+id/scrollMain"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusableInTouchMode="true"
app:layout_constraintTop_toBottomOf="@+id/abMainLayout">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<GridLayout
android:id="@+id/gridMoney"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorBackgroundAccent"
android:orientation="horizontal"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingTop="24dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/abMain">
<TextView
android:id="@+id/sumTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_columnSpan="5"
android:layout_columnWeight="1"
android:layout_gravity="center"
android:layout_marginBottom="16dp"
android:layout_marginTop="8dp"
android:layout_row="1"
android:textColor="@color/colorDarkText"
android:textSize="50sp"
android:textStyle="bold" />
<ImageView
android:id="@+id/moneyImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="1"
android:layout_columnWeight="1"
android:layout_gravity="right|center_vertical"
android:layout_row="2"
android:background="@android:color/transparent"
android:scaleX="0.5"
android:scaleY="0.5"
app:srcCompat="@drawable/ic_money" />
<TextView
android:id="@+id/moneyTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="2"
android:layout_columnWeight="1"
android:layout_gravity="left|center_vertical"
android:layout_row="2"
android:background="@android:color/transparent"
android:textColor="@color/colorLightText"
android:textSize="15sp" />
<ImageView
android:id="@+id/sharesImg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="3"
android:layout_columnWeight="1"
android:layout_gravity="right|center_vertical"
android:layout_row="2"
android:background="@android:color/transparent"
android:scaleX="0.5"
android:scaleY="0.5"
app:srcCompat="@drawable/outline_assessment_black_36" />
<TextView
android:id="@+id/sharesTxt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="4"
android:layout_columnWeight="1"
android:layout_gravity="left|center_vertical"
android:layout_row="2"
android:background="@android:color/transparent"
android:textColor="@color/colorLightText"
android:textSize="15sp" />
</GridLayout>
<View
android:id="@+id/dividerMoney"
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="@color/colorDivider"
app:layout_constraintTop_toBottomOf="@id/gridMoney" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginEnd="@dimen/recycler_horizontal_margin"
android:layout_marginStart="@dimen/recycler_horizontal_margin"
android:layout_marginTop="@dimen/activity_vertical_margin"
android:text="Aktien"
android:textColor="@color/colorPrimary"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="@+id/dividerMoney"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/gridMoney" />
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerShares"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="@dimen/recycler_title_bottom_margin"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/textView" />
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
</android.support.constraint.ConstraintLayout>
StateListAnimator stateListAnimator = new StateListAnimator();
stateListAnimator.addState(new int[0], ObjectAnimator.ofFloat(view, "elevation", 0));
appBarLayout.setStateListAnimator(stateListAnimator);
toolbarLayout = findViewById(R.id.abMainLayout);
toolbarLayout.StateListAnimator = null;