求大神解答，老是NullpointerException
图片上传不了，只能文本形式。
1.Logcat
08-01 08:46:07.112: E/AndroidRuntime(1498): FATAL EXCEPTION: main
08-01 08:46:07.112: E/AndroidRuntime(1498): Process: com.home.baidumap, PID: 1498
08-01 08:46:07.112: E/AndroidRuntime(1498): java.lang.RuntimeException: Unable to resume activity {com.home.baidumap/com.home.baidumap.MainActivity}: java.lang.NullPointerException
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2788)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2817)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.access$800(ActivityThread.java:135)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.os.Handler.dispatchMessage(Handler.java:102)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.os.Looper.loop(Looper.java:136)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.main(ActivityThread.java:5017)
08-01 08:46:07.112: E/AndroidRuntime(1498): at java.lang.reflect.Method.invokeNative(Native Method)
08-01 08:46:07.112: E/AndroidRuntime(1498): at java.lang.reflect.Method.invoke(Method.java:515)
08-01 08:46:07.112: E/AndroidRuntime(1498): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
08-01 08:46:07.112: E/AndroidRuntime(1498): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
08-01 08:46:07.112: E/AndroidRuntime(1498): at dalvik.system.NativeStart.main(Native Method)
08-01 08:46:07.112: E/AndroidRuntime(1498): Caused by: java.lang.NullPointerException
08-01 08:46:07.112: E/AndroidRuntime(1498): at com.home.baidumap.MainActivity.onResume(MainActivity.java:50)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1192)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.Activity.performResume(Activity.java:5310)
08-01 08:46:07.112: E/AndroidRuntime(1498): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2778)
08-01 08:46:07.112: E/AndroidRuntime(1498): ... 12 more
2.源代码
package com.home.baidumap;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.MapView;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
private MapView mMapView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//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());
setContentView(R.layout.activity_main);
initView();
}
private void initView(){
//获开地图控件引用
mMapView = (MapView) findViewById(R.id.bmapView);
}
@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();
//在activity执行onResume时执行mMapView. onResume ()，实现地图生命周期管理
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();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
} |
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我发现代码是我复制过去的，但是我亲自打的时候，没有onresume,onpause等的构造函数的提示和补全，我那个java proposals那个选项也勾选了，还是不行，是不是我丢失了什么包？大神。还有我那个public class MainActivity extends ActionBarActivity，不是extends Activity.这是怎么回事？ |
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