Java 致命异常:Android开发的主要错误
错误:Java 致命异常:Android开发的主要错误,java,android,exception,Java,Android,Exception,错误: 02-19 21:28:52.920: E/AndroidRuntime(17041): FATAL EXCEPTION: main 02-19 21:28:52.920: E/AndroidRuntime(17041): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.gamecik/com.example.gamecik.MainActivity}: java.lang.Cl
02-19 21:28:52.920: E/AndroidRuntime(17041): FATAL EXCEPTION: main
02-19 21:28:52.920: E/AndroidRuntime(17041): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.gamecik/com.example.gamecik.MainActivity}: java.lang.ClassCastException: com.google.android.gms.ads.AdView cannot be cast to android.widget.LinearLayout
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2304)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread.access$700(ActivityThread.java:165)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1326)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.os.Handler.dispatchMessage(Handler.java:99)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.os.Looper.loop(Looper.java:137)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread.main(ActivityThread.java:5450)
02-19 21:28:52.920: E/AndroidRuntime(17041): at java.lang.reflect.Method.invokeNative(Native Method)
02-19 21:28:52.920: E/AndroidRuntime(17041): at java.lang.reflect.Method.invoke(Method.java:525)
02-19 21:28:52.920: E/AndroidRuntime(17041): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1187)
02-19 21:28:52.920: E/AndroidRuntime(17041): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
02-19 21:28:52.920: E/AndroidRuntime(17041): at dalvik.system.NativeStart.main(Native Method)
02-19 21:28:52.920: E/AndroidRuntime(17041): Caused by: java.lang.ClassCastException: com.google.android.gms.ads.AdView cannot be cast to android.widget.LinearLayout
02-19 21:28:52.920: E/AndroidRuntime(17041): at com.example.gamecik.MainActivity.onCreate(MainActivity.java:32)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.Activity.performCreate(Activity.java:5369)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
02-19 21:28:52.920: E/AndroidRuntime(17041): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
当我使用Admob代码时,我的应用程序出错。如果我删除Admob代码,我的应用程序正常。。
请帮帮我。。。
很抱歉,这个问题没有提供太多信息,我只是不知道该给你什么信息(如果有意义的话?),请回答并告诉我你需要什么信息,并感谢你的帮助
这是我的密码:
我的活动JAVA
package com.example.gamecik;
import com.google.android.gms.ads.AdSize;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import android.os.Bundle;
import android.app.Activity;
import android.media.MediaPlayer;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.LinearLayout;
public class MainActivity extends Activity implements OnClickListener {
private MediaPlayer mp;
private AdView adView;
private static final String AD_UNIT_ID = "ca-app-pub-1715534499344773/3123443647";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adView = new AdView(this);
adView.setAdUnitId(AD_UNIT_ID);
adView.setAdSize(AdSize.BANNER);
LinearLayout layout = (LinearLayout)findViewById(R.id.adView);
layout.addView(adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
// Add click listeners to all the ImageButtons
View button1 = findViewById(R.id.sescalbuton);
View button2 = findViewById(R.id.magnumsilah);
View button3 = findViewById(R.id.Button03);
View button4 = findViewById(R.id.Button02);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
button3.setOnClickListener(this);
button4.setOnClickListener(this);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
// Required method if OnClickListener is implemented
@Override
public void onClick(View v) {
// Find which ImageButton was pressed and take appropriate action
switch(v.getId()){
// The cow button
case R.id.sescalbuton:
mp = MediaPlayer.create(this, R.raw.ak47);
break;
// The duck button
case R.id.magnumsilah:
mp = MediaPlayer.create(this, R.raw.magnum);
break;
// The sheep button
case R.id.Button03:
mp = MediaPlayer.create(this, R.raw.shotgun);
break;
// The uzi
case R.id.Button02:
mp = MediaPlayer.create(this, R.raw.uzi);
break;
}
mp.seekTo(0);
mp.start();
}
}
我的XML代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.android.gms.ads"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/wood"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/sescalbuton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/shotgun"
android:layout_below="@+id/magnumsilah"
android:background="@drawable/ak47" />
<Button
android:id="@+id/Button03"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/sescalbuton"
android:layout_centerHorizontal="true"
android:background="@drawable/sohtgun" />
<Button
android:id="@+id/Button02"
android:layout_width="150dp"
android:layout_height="110dp"
android:layout_above="@+id/sescalbuton"
android:layout_alignRight="@+id/sescalbuton"
android:background="@drawable/guns" />
<com.google.android.gms.ads.AdView
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/adView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
ads:adUnitId="ca-app-pub-1715534499344773/3123443647"
ads:adSize="BANNER"/>
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/adView"
android:layout_alignTop="@+id/adView"
android:layout_marginTop="28dp"
android:src="@drawable/supperweapon" />
<Button
android:id="@+id/magnumsilah"
android:layout_width="150dp"
android:layout_height="100dp"
android:layout_alignLeft="@+id/imageView1"
android:layout_below="@+id/imageView1"
android:background="@drawable/magnum" />
</RelativeLayout>
请帮助我…问题出在哪里?查找布局文件中的R.id.adview。这不是一个线性布局,但你试图把它作为一个演员。这就是它崩溃的原因。可能是个建议?问题似乎就在这里
LinearLayout layout = (LinearLayout)findViewById(R.id.adView);
我相信你正在尝试将AdView布局转换为线性布局
将R.id.adView更改为线性布局的id。如果不是这样的话,也发布你的布局xml。如果我理解正确,铸造并不是你唯一的问题。您正在尝试将AdView添加到活动XML中不存在的LinearLayout。但是,在XML中,您添加了一个AdView,并动态地启动了一个AdView,这没有任何意义。将onCreate(..)代码更改为以下内容:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
adView = (AdView) findViewById(R.id.adView);
adView.setAdUnitId(AD_UNIT_ID);
adView.setAdSize(AdSize.BANNER);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
//.... rest of your onCreate() code
}
在更换位置后,尝试清理项目。这对我有用 错误很明显:从第二行开始:“AdView不能在com.example.gamecik.MainActivity.onCreate(MainActivity.java:32)”再往下一点(第15行):“由:java.lang.ClassCastException引起:com.google.android.gms.ads.AdView不能在com.example.gamecik.MainActivity.onCreate(MainActivity.java:32)”转换为安卓.widget.LinearLayout。因此,请查看源代码中的第32行,您正在将
AdView
作为LinearLayout
进行打字。正如错误消息明确指出的那样,您不能这样做。阅读错误消息中的实际单词-它们通常实际上有意义。我的错误不同,但这个答案给了我一个线索,这是由于不存在的对象导致的错误!