为什么代码出错了啊
这是我的主文件 package com.example.viewfilpper; import android.app.Activity; import android.os.Bundle; import android.widget.ImageView; import android.widget.ViewFlipper; public class MainActivity extends Activity { private ViewFlipper flipper; //将资源设置在一个数组当中 private int[]resID={R.drawable.pic1,R.drawable.pic2,R.drawable.pic3,R.drawable.pic4,}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //初始化 flipper=(ViewFlipper) findViewById(R.layout.main); //用动态导入的方式为viewflipper加入子view for (int i = 0; i < resID.length; i++) { flipper.addView(getImageView(resID[i])); } //添加动画效果 flipper.setInAnimation(this, R.anim.left_in); flipper.setOutAnimation(this, R.anim.left_out); //设置视图切换时间 flipper.setFlipInterval(1000); flipper.startFlipping(); } private ImageView getImageView(int resID){ ImageView image=new ImageView(this); // image.setImageResource(resID); image.setBackgroundResource(resID);//显示铺面屏幕的照片 return image; } }
这是我的main函数
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <ViewFlipper android:layout_height="match_parent" android:layout_width="match_parent" android:id="@+id/flipper" ></ViewFlipper> </LinearLayout>
这是log日志
08-06 11:14:07.668: D/dalvikvm(5486): GC_FOR_ALLOC freed 100K, 5% free 3059K/3220K, paused 8ms, total 8ms 08-06 11:14:07.672: I/dalvikvm-heap(5486): Grow heap (frag case) to 3.504MB for 486012-byte allocation 08-06 11:14:07.692: D/dalvikvm(5486): GC_FOR_ALLOC freed 3K, 5% free 3531K/3696K, paused 18ms, total 18ms 08-06 11:14:07.696: D/AndroidRuntime(5486): Shutting down VM 08-06 11:14:07.696: W/dalvikvm(5486): threadid=1: thread exiting with uncaught exception (group=0x94d6fb20) 08-06 11:14:07.712: E/AndroidRuntime(5486): FATAL EXCEPTION: main 08-06 11:14:07.712: E/AndroidRuntime(5486): Process: com.example.viewfilpper, PID: 5486 08-06 11:14:07.712: E/AndroidRuntime(5486): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.viewfilpper/com.example.viewfilpper.MainActivity}: java.lang.NullPointerException 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2219) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2269) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread.access$800(ActivityThread.java:135) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.os.Handler.dispatchMessage(Handler.java:102) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.os.Looper.loop(Looper.java:136) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread.main(ActivityThread.java:5045) 08-06 11:14:07.712: E/AndroidRuntime(5486): at java.lang.reflect.Method.invokeNative(Native Method) 08-06 11:14:07.712: E/AndroidRuntime(5486): at java.lang.reflect.Method.invoke(Method.java:515) 08-06 11:14:07.712: E/AndroidRuntime(5486): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 08-06 11:14:07.712: E/AndroidRuntime(5486): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 08-06 11:14:07.712: E/AndroidRuntime(5486): at dalvik.system.NativeStart.main(Native Method) 08-06 11:14:07.712: E/AndroidRuntime(5486): Caused by: java.lang.NullPointerException 08-06 11:14:07.712: E/AndroidRuntime(5486): at com.example.viewfilpper.MainActivity.onCreate(MainActivity.java:34) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.Activity.performCreate(Activity.java:5231) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104) 08-06 11:14:07.712: E/AndroidRuntime(5486): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2163) 08-06 11:14:07.712: E/AndroidRuntime(5486): ... 11 more
问题出在哪儿呢?谢谢