我正在使用Picasso库加载图片。但findViewById()
方法在三星7英寸标签上返回null
对象而不是ImageView
对象,但在较小的移动设备上完美运行。
代码段:
public class SplashScreenActivity extends FragmentActivity {
private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().getAttributes().windowAnimations = R.style.ActivityTransition;
setContentView(R.layout.activity_splash);
Picasso.with(this).load(R.drawable.splash_new).into((ImageView) findViewById(R.id.background_image));
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
registerForGcm();
}
}
堆栈跟踪:
Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.buyer/com.example.buyer.activity.SplashScreenActivity}:
java.lang.IllegalArgumentException: Target must not be null.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2262)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2316)
at android.app.ActivityThread.access$700(ActivityThread.java:158)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1296)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5365)
at java.lang.reflect.Method.invokeNative(Method.java)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
at dalvik.system.NativeStart.main(NativeStart.java)
Caused by java.lang.IllegalArgumentException: Target must not be null.
各种外形规格的布局文件:
布局/ activity_splash
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/background_image"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:src="@drawable/splash_new" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="150dp" />
</RelativeLayout>
大/ activity_splash
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/background_image"
android:scaleType="centerCrop"
android:layout_width="fill_parent"
android:layout_height="match_parent" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_marginBottom="230dp"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
小/ activity_splash
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ImageView
android:id="@+id/background_image"
android:scaleType="centerCrop"
android:layout_width="fill_parent"
android:layout_height="match_parent" />
<ProgressBar
android:id="@+id/progress_bar"
android:layout_marginBottom="120dp"
android:layout_centerHorizontal="true"
android:layout_alignParentBottom="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
XLARGE / activity_splash
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="@+id/background_image"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"/>
<ProgressBar
android:id="@+id/progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="350dp" />
</RelativeLayout>