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各组件之前初始化context信息，传入ApplicationContext
//注意该方法要再setContentView方法之前实现
SDKInitializer.initialize(getApplicationContext());
//获取地图控件引用
mMapView = (MapView) findViewById(R.id.id_bmapView);
setContentView(R.layout.activity_main);
}
@Override
protected void onDestroy() {
super.onDestroy();
//在activity执行onDestroy时执行mMapView.onDestroy()，实现地图生命周期管理
mMapView.onDestroy();
}
@Override
protected void onResume() {
super.onResume();
mMapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
//在activity执行onPause时执行mMapView. onPause ()，实现地图生命周期管理
mMapView.onPause();
}
}
Logcat提示错处：08-22 11:22:02.320: E/AndroidRuntime(1804): FATAL EXCEPTION: main
Process: 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.NullPointerException
at 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)
把获取地图控件引用 放到setContentView下面
setContentView(R.layout.activity_main);
//获取地图控件引用
mMapView = (MapView) findViewById(R.id.id_bmapView);
SDKInitializer.initialize(getApplicationContext()); 一般在Application 那里初始化。