[英]Error: android.widget.LinearLayout cannot be cast to android.widget.ImageView
There was already someone else with a similar problem, but I couldn't understand the anwser and I wasn't able to add a coment to receive more informations. 已经有其他人遇到类似的问题,但是我无法理解答案,也无法添加注释以接收更多信息。 So please help me! 所以请帮帮我!
This is my main JavaClass 这是我的主要JavaClass
package ch.androidnewcomer.muckenfangfinal;
import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.os.Handler;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Date;
import java.util.Random;
public class GameActivity extends Activity implements View.OnClickListener, Runnable{
public static final int DELAY_MILLIS = 1000;
public static final int ZEITSCHEIBEN = 60;
public float massstab;
private int runde;
private int punkte;
private int muecken;
private int gefangeneMuecken;
private int zeit;
private static final long HOECHSTALTER_MS = 2000;
private Random zufallsgenerator = new Random();
private ViewGroup spielbereich;
private Handler handler = new Handler();
private boolean spielLaeuft;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_game);
massstab = getResources().getDisplayMetrics().density;
spielbereich = (ViewGroup)findViewById(R.id.spielbereich);
spielStarten();
}
private void spielStarten() {
spielLaeuft = true;
runde = 0;
punkte = 0;
starteRunde();
}
private void bildschirmAktualisieren() {
TextView tvPunkte = (TextView)findViewById(R.id.points);
tvPunkte.setText(Integer.toString(punkte));
TextView tvRunde = (TextView)findViewById(R.id.round);
tvRunde.setText(Integer.toString(runde));
TextView tvTreffer = (TextView)findViewById(R.id.hits);
tvTreffer.setText(Integer.toString(gefangeneMuecken));
TextView tvZeit = (TextView)findViewById(R.id.time);
tvZeit.setText(Integer.toString(zeit/(1000/DELAY_MILLIS)));
FrameLayout flTreffer = (FrameLayout)findViewById(R.id.bar_hits);
FrameLayout flZeit = (FrameLayout)findViewById(R.id.bar_time);
ViewGroup.LayoutParams lpTreffer = flTreffer.getLayoutParams();
lpTreffer.width = Math.round( massstab * 300 * Math.min( gefangeneMuecken,muecken) / muecken);
ViewGroup.LayoutParams lpZeit = flZeit.getLayoutParams();
lpZeit.width = Math.round( massstab * zeit *300 / ZEITSCHEIBEN);
}
private void zeitHerunterzaehlen() {
zeit = zeit - 1;
if(zeit % (1000/DELAY_MILLIS) == 0) {
float zufallszahl = zufallsgenerator.nextFloat();
double wahrscheinlichkeit = muecken * 1.5;
if (wahrscheinlichkeit > 1) {
eineMueckeAnzeigen();
if (zufallszahl < wahrscheinlichkeit - 1) {
eineMueckeAnzeigen();
}
} else {
if (zufallszahl < wahrscheinlichkeit) {
eineMueckeAnzeigen();
}
}
}
mueckenVerschwinden();
bildschirmAktualisieren();
if(!pruefeSpielende()) {
if(!pruefeRundenende()) {
handler.postDelayed(this, DELAY_MILLIS);
}
}
}
private boolean pruefeRundenende() {
if (gefangeneMuecken >= muecken) {
starteRunde();
return true;
}
return false;
}
private void starteRunde() {
runde = runde +1;
muecken = runde *10;
gefangeneMuecken = 0;
zeit = ZEITSCHEIBEN;
bildschirmAktualisieren();
handler.postDelayed(this, DELAY_MILLIS);
}
private boolean pruefeSpielende() {
if(zeit == 0 && gefangeneMuecken < muecken) {
gameOver();
return true;
}
return false;
}
private void gameOver() {
Dialog dialog = new Dialog(this, android.R.style.Theme_Translucent_NoTitleBar_Fullscreen);
dialog.setContentView(R.layout.gameover);
dialog.show();
spielLaeuft = false;
}
private void mueckenVerschwinden() {
int nummer=0;
while (nummer < spielbereich.getChildCount()) {
ImageView muecke = (ImageView)spielbereich.getChildAt(nummer);
Date geburtsdatum = (Date) muecke.getTag(R.id.geburtsdatum);
long alter = (new Date()).getTime() - geburtsdatum.getTime();
if(alter > HOECHSTALTER_MS) {
spielbereich.removeView(muecke);
}else {
nummer++;
}
}
}
private void eineMueckeAnzeigen() {
int breite = spielbereich.getWidth();
int hoehe = spielbereich.getHeight();
int muecke_breite = (int) Math.round(massstab* 60);
int muecke_hoehe = (int) Math.round(massstab*49);
int links = zufallsgenerator.nextInt(breite - muecke_breite);
int oben = zufallsgenerator.nextInt(hoehe - muecke_hoehe);
ImageView muecke = new ImageView(this);
muecke.setImageResource(R.drawable.muecke);
muecke.setOnClickListener(this);
muecke.setTag(R.id.geburtsdatum, new Date());
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(muecke_breite, muecke_hoehe);
params.leftMargin = links;
params.topMargin = oben;
params.gravity = Gravity.TOP + Gravity.LEFT;
spielbereich.addView(muecke,params);
}
@Override
public void onClick(View muecke) {
gefangeneMuecken++;
punkte += 100;
bildschirmAktualisieren();
spielbereich.removeView(muecke);
}
@Override
public void run() {
zeitHerunterzaehlen();
}
}
The FrameLayout, where I'm trying to display the 'muecke - mosquito' is called 'spielbereich' meaning as much as playground. 我试图在其中显示“ muecke-mosquito”的FrameLayout称为“ spielbereich”,意思与游乐场一样多。
And this is the LogCat 这是LogCat
12-28 16:19:26.449 5302-5302/ch.androidnewcomer.muckenfangfinal E/AndroidRuntime: FATAL EXCEPTION: main
Process: ch.androidnewcomer.muckenfangfinal, PID: 5302
java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.ImageView
at ch.androidnewcomer.muckenfangfinal.GameActivity.mueckenVerschwinden(GameActivity.java:168)
at ch.androidnewcomer.muckenfangfinal.GameActivity.zeitHerunterzaehlen(GameActivity.java:104)
at ch.androidnewcomer.muckenfangfinal.GameActivity.run(GameActivity.java:218)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6776)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410)
And here is my xmlLayout: 这是我的xmlLayout:
<?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"
tools:context="ch.androidnewcomer.muckenfangfinal.GameActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="61dp">
<TextView
android:id="@+id/round"
android:layout_width="136dp"
android:layout_height="wrap_content"
android:text="TextView"
android:textSize="21sp"
android:textStyle="bold" />
<TextView
android:id="@+id/points"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="TextView"
android:textSize="21sp"
android:textStyle="bold" />
</FrameLayout>
<FrameLayout
android:id="@+id/spielbereich"
android:layout_width="match_parent"
android:layout_height="332dp"
android:layout_weight="1">
<LinearLayout
android:id="@+id/hintergrundlinearlayout"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_gravity="bottom"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="35dp">
<FrameLayout
android:id="@+id/bar_hits"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:background="@android:color/holo_orange_dark">
</FrameLayout>
<TextView
android:id="@+id/hits"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="@string/hits"
android:textSize="15sp"
android:textStyle="bold" />
</FrameLayout>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:id="@+id/bar_time"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:background="@android:color/holo_orange_light">
</FrameLayout>
<TextView
android:id="@+id/time"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:text="@string/time" />
</FrameLayout>
</LinearLayout>
</FrameLayout>
</LinearLayout>
if you need anymore informations, please tell me. 如果您需要更多信息,请告诉我。 It would be great if you could tell me exactely how I have to change the code, because I'm really a beginner. 如果您能确切地告诉我如何更改代码,那将是很好的,因为我确实是一个初学者。
you are casting a linear layout to imageview.You are trying to get a child of frame layout which is a linear layout but you casted it to a image view.thats why this error was happened. 您正在将线性布局投射到imageview。您试图获取框架布局的子级,它是线性布局,但是您将其投射到了图像视图。这就是发生此错误的原因。 casting it to the linearlayout will solve this error. 将其转换为linearlayout将解决此错误。
This is your layout with id spielbereich
这是您的ID为spielbereich
的布局
<FrameLayout
android:id="@+id/spielbereich"
android:layout_width="match_parent"
android:layout_height="332dp"
android:layout_weight="1">
<LinearLayout
android:id="@+id/hintergrundlinearlayout"
android:layout_width="match_parent"
android:layout_height="70dp"
android:layout_gravity="bottom"
android:orientation="vertical">
And this is the code where you are trying to cast the childView
into an ImageView
这是您尝试将childView
转换为ImageView
private void mueckenVerschwinden() {
int nummer=0;
while (nummer < spielbereich.getChildCount()) {
ImageView muecke = (ImageView)spielbereich.getChildAt(nummer);
Date geburtsdatum = (Date) muecke.getTag(R.id.geburtsdatum);
long alter = (new Date()).getTime() - geburtsdatum.getTime();
if(alter > HOECHSTALTER_MS) {
spielbereich.removeView(muecke);
}else {
nummer++;
}
}
}
ImageView muecke = (ImageView)spielbereich.getChildAt(nummer);
This line is giving you a cast error because nummer = 0
at this point and spielbereich.getChildAt(0)
is a LinearLayout 这行给您一个nummer = 0
错误,因为此时nummer = 0
且spielbereich.getChildAt(0)
是LinearLayout
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