package com.home.baidumap;import com.baidu.mapapi.SDKInitializer;import com.baidu.mapapi.map.MapView;import android.app.Activity;import android.os.Bundle;import android.view.Window;public class MainActivity extends Activity { MapView mMapView=null; ? ?@Override ? ?protected void onCreate(Bundle savedInstanceState) { ? ? ? ?super.onCreate(savedInstanceState); ? ? ? ?requestWindowFeature(Window.FEATURE_NO_TITLE); ? ? ? ?//在使用SDK各組件之前初始化context信息，傳入ApplicationContext ? ? ? ? ?//注意該方法要再setContentView方法之前實現 ? ? ? ? ?SDKInitializer.initialize(getApplicationContext()); ? ? ? ? ?//獲取地圖控件引用 ? ? ? ?mMapView = (MapView) findViewById(R.id.id_bmapView); ? ? ? ?setContentView(R.layout.activity_main); ? ? ?} ? ? ?@Override ? ? ?protected void onDestroy() { ? ? ? ? ?super.onDestroy(); ? ? ? ? ?//在activity執行onDestroy時執行mMapView.onDestroy()，實現地圖生命周期管理 ? ? ? ? ?mMapView.onDestroy(); ? ? ?} ? ? ? ? ?@Override ? ?protected void onResume() { ? ? super.onResume(); ? ? mMapView.onResume(); ? ?} ? ? ?@Override ? ? ?protected void onPause() { ? ? ? ? ?super.onPause(); ? ? ? ? ?//在activity執行onPause時執行mMapView. onPause ()，實現地圖生命周期管理 ? ? ? ? ?mMapView.onPause(); ? ? ? ? ?} ??}Logcat提示錯處：08-22 11:22:02.320: E/AndroidRuntime(1804): FATAL EXCEPTION: mainProcess: com.home.baidumap, PID: 1804 java.lang.RuntimeException: Unable to resume activity {com.home.baidumap/com.home.baidumap.MainActivity}: java.lang.NullPointerException ?at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2788) at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2817) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250) ?at android.app.ActivityThread.access$800(ActivityThread.java:135)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:136) ?at android.app.ActivityThread.main(ActivityThread.java:5017) at java.lang.reflect.Method.invokeNative(Native Method)at java.lang.reflect.Method.invoke(Method.java:515) ?at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) E/AndroidRuntime(1804): ?at dalvik.system.NativeStart.main(Native Method)Caused by: java.lang.NullPointerExceptionat com.home.baidumap.MainActivity.onResume(MainActivity.java:40) ?at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192) at android.app.Activity.performResume(Activity.java:5310) E/AndroidRuntime at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2778)