Java NullPointerException仅适用于某些设备上的动画
一些设备在启动此应用程序时抛出NullPointerException,但其他设备似乎工作正常。由于Java NullPointerException仅适用于某些设备上的动画,java,android,nullpointerexception,Java,Android,Nullpointerexception,一些设备在启动此应用程序时抛出NullPointerException,但其他设备似乎工作正常。由于ivMonkeyStart错误引用不为空,我似乎不知道该怎么办。我尝试了不同的方法设置ivMonkeyStart,但没有找到一种方法可以改变 public class MainActivity extends Activity { ImageView ivMonkeyStart; Context context; @Override protected void
ivMonkeyStart
错误引用不为空,我似乎不知道该怎么办。我尝试了不同的方法设置ivMonkeyStart
,但没有找到一种方法可以改变
public class MainActivity extends Activity {
ImageView ivMonkeyStart;
Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ivMonkeyStart = (ImageView)findViewById(R.id.ivMonkeyStart);
final Animation startMonkeyScaleIn = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.start_scale);
final Animation startMonkeyPulse = AnimationUtils.loadAnimation(this, R.anim.start_pulse);
ivMonkeyStart.startAnimation(startMonkeyScaleIn);
startMonkeyScaleIn.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}
@Override
public void onAnimationEnd(Animation animation) {
ivMonkeyStart.startAnimation(startMonkeyPulse);
}
@Override
public void onAnimationRepeat(Animation animation) {
}
});
ivMonkeyStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FlurryAgent.logEvent("Clicked Start");
Intent myIntent = new Intent(MainActivity.this, GuessActivity.class);
MainActivity.this.startActivity(myIntent);
}
});
}
以下是日志:
01-01 22:59:56.658 2188-2188/com.zdkapps.guesszoo E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.zdkapps.guesszoo, PID: 2188
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zdkapps.guesszoo/com.zdkapps.guesszoo.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.startAnimation(android.view.animation.Animation)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.startAnimation(android.view.animation.Animation)' on a null object reference
at com.zdkapps.guesszoo.MainActivity.onCreate(MainActivity.java:49)
at android.app.Activity.performCreate(Activity.java:5933)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)
at android.app.ActivityThread.access$800(ActivityThread.java:144)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
错误引用了此行:
ivMonkeyStart.startAnimation(startMonkeyScaleIn)代码>
有什么想法吗?谢谢 复制自问答机制的评论:
这些设备是什么?有什么特别的区别吗?也许您有两个布局,一个带有ivMonkeyStart ImageView,另一个没有,这些设备会得到第二个布局?这些设备是什么?有什么特别的区别吗?也许你有两个布局,一个有ivMonkeyStart ImageView,一个没有,这些设备得到了第二个布局?不知道为什么我没有想到,但这确实是问题所在。非常感谢,如果你能回答这个问题,我会选择它作为最佳答案。很好!我已经发布了推荐信作为答复