我運行我的應用程式，當我希望打開 SheetActivity.java 時它崩潰了該錯誤顯示了我的作業表活動中的錯誤，但我的該活動的 xml 檔案不包含應用程式欄布局。我的toolbar.xml 包含應用欄布局，并且我在activity_sheet.xml 中包含了工具列。我的 SheetActivity.java:-
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TableLayout;
import android.widget.TableRow;
import android.widget.TextView;
import java.util.Calendar;
public class SheetActivity extends AppCompatActivity {
Toolbar toolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sheet);
showTable();
setToolbar();
}
private void setToolbar() {
toolbar = findViewById(R.id.toolSheet);
TextView title = toolbar.findViewById(R.id.title_toolbar);
TextView subtitle = toolbar.findViewById(R.id.subtitle_toolbar);
ImageButton back = toolbar.findViewById(R.id.back);
ImageButton save = toolbar.findViewById(R.id.save);
title.setText("Attendance Sheet");
subtitle.setVisibility(View.GONE);
back.setVisibility(View.INVISIBLE);
save.setVisibility(View.INVISIBLE);
}
private void showTable() {
DbHelper dbHelper = new DbHelper(this);
TableLayout tableLayout = findViewById(R.id.tableLayout);
long[] idArray = getIntent().getLongArrayExtra("idArray");
int[] rollArray = getIntent().getIntArrayExtra("rollArray");
String[] nameArray = getIntent().getStringArrayExtra("nameArray");
String month = getIntent().getStringExtra("month");
int DAY_IN_MONTH = getDayInMonth(month);
int rowSize = idArray.length 1;
TableRow[] rows = new TableRow[rowSize];
TextView[] roll_tvs = new TextView[rowSize];
TextView[] name_tvs = new TextView[rowSize];
TextView[][] status_tvs = new TextView[rowSize][DAY_IN_MONTH 1];
for (int i = 0; i<rowSize; i ){
roll_tvs[i] = new TextView(this);
name_tvs[i] = new TextView(this);
for (int j = 1; j <= DAY_IN_MONTH; j ){
status_tvs[i][j] = new TextView(this);
}
}
roll_tvs[0].setText("Roll");
roll_tvs[0].setTypeface(roll_tvs[0].getTypeface(), Typeface.BOLD);
name_tvs[0].setText("Name");
name_tvs[0].setTypeface(name_tvs[0].getTypeface(), Typeface.BOLD);
for (int i = 1; i <= DAY_IN_MONTH; i ){
status_tvs[0][i].setText(String.valueOf(i));
status_tvs[0][i].setTypeface(status_tvs[0][i].getTypeface(), Typeface.BOLD);
}
for (int i = 1; i<rowSize; i ){
roll_tvs[i].setText(String.valueOf(rollArray[i-1]));
name_tvs[i].setText(nameArray[i-1]);
for (int j = 1; j <= DAY_IN_MONTH; j ){
String day = String.valueOf(j);
if (day.length()==1) day = "0" day;
String date = day "." month;
String status = dbHelper.getStatus(idArray[i-1], date);
status_tvs[i][j].setText(status);
}
}
for (int i = 0; i<rowSize; i ){
rows[i] = new TableRow(this);
if(i%2==0)
rows[i].setBackgroundColor(Color.parseColor("#EEEEEE"));
else rows[i].setBackgroundColor(Color.parseColor("#E4E4E4"));
roll_tvs[i].setPadding(16,16,16,16);
name_tvs[i].setPadding(16,16,16,16);
rows[i].addView(roll_tvs[i]);
rows[i].addView(name_tvs[i]);
for (int j = 1; j <= DAY_IN_MONTH; j ){
status_tvs[i][j].setPadding(16,16,16,16);
rows[i].addView(status_tvs[i][j]);
}
tableLayout.addView(rows[i]);
}
tableLayout.setShowDividers(TableLayout.SHOW_DIVIDER_MIDDLE);
}
private int getDayInMonth(String month) {
int monthIndex = Integer.parseInt(month.substring(0, 2)) - 1;
int year = Integer.parseInt(month.substring(3));
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.MONTH, monthIndex);
calendar.set(Calendar.YEAR, year);
return calendar.getActualMaximum(Calendar.DAY_OF_MONTH);
}
}
我的 SheetActivity.java xml 檔案 - activity_sheet.xml:-
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".SheetActivity">
<include
android:id="@ id/toolSheet"
layout="@layout/toolbar"
android:layout_width="427dp"
android:layout_height="wrap_content" />
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="none">
<HorizontalScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:scrollbars="none">
<LinearLayout
android:layout_width="wrap_content"
android:padding="16dp"
android:layout_height="wrap_content">
<TableLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/tableLayout"
android:background="#FFFFFF"
android:divider="@android:color/black"
android:showDividers="beginning|middle|end"
android:stretchColumns="*"/>
</LinearLayout>
</HorizontalScrollView>
</ScrollView>
</LinearLayout>
出現的錯誤：-
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.manage.attendx/com.manage.attendx.SheetActivity}: java.lang.ClassCastException: com.google.android.material.appbar.AppBarLayout cannot be cast to androidx.appcompat.widget.Toolbar
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2984)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3119)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1839)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6864)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Caused by: java.lang.ClassCastException: com.google.android.material.appbar.AppBarLayout cannot be cast to androidx.appcompat.widget.Toolbar
at com.manage.attendx.SheetActivity.setToolbar(SheetActivity.java:28)
at com.manage.attendx.SheetActivity.onCreate(SheetActivity.java:25)
at android.app.Activity.performCreate(Activity.java:7232)
at android.app.Activity.performCreate(Activity.java:7221)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2964)
... 11 more
我的工具列 xml 檔案：-
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/toolbar">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="16dp">
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/back"
android:background="@android:color/transparent"
android:layout_centerVertical="true"
android:src="@drawable/icon_back"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginRight="36dp"
android:layout_marginLeft="36dp"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/title_toolbar"
android:gravity="center_horizontal"
android:text="Title"
android:textSize="16sp"
android:textStyle="bold"
android:textColor="#FFFFFF"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/subtitle_toolbar"
android:gravity="center_horizontal"
android:text="Subtitle"
android:textSize="12sp"
android:textColor="#FFFFFF"
android:textStyle="bold"/>
</LinearLayout>
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@ id/save"
android:background="@android:color/transparent"
android:layout_alignParentRight="true"
android:src="@drawable/icon_save"
android:layout_centerVertical="true"/>
</RelativeLayout>
</androidx.appcompat.widget.Toolbar>
</com.google.android.material.appbar.AppBarLayout>
有人可以幫我解決這個問題嗎？
uj5u.com熱心網友回復：
答案 - 為了解決這個問題，我們必須洗掉方法 setToolbar(); 來自 SheetActivity.java 。
否則，無法將 AppBarLayout 強制轉換為 androidx.appcopat.widget.toolbar
轉載請註明出處，本文鏈接：https://www.uj5u.com/qianduan/326266.html