我在两个不同的活动中使用intent-extra,然后使用来自不同活动的ContentValue使用单个包存储它们......但它向我显示错误......这是我使用内容值的活动代码......
package com.example.alert;
import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class StoringEntire extends Activity {
DatabaseHelper db=new DatabaseHelper(this);
public static String alerterName;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.storing_entire);
Button save=(Button) findViewById(R.id.save);
save.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
Bundle bundle=getIntent().getExtras();
alerterName=bundle.getString("alerterName");
double lat=bundle.getDouble("Latitude");
double lon=bundle.getDouble("Longitude");
SQLiteDatabase datab=db.getWritableDatabase();
ContentValues cv=new ContentValues();
cv.put(db.KEY_ALERT, alerterName);
cv.put(db.KEY_LATITUDE,lat);
cv.put(db.KEY_LONGITUDE, lon);
datab.insert("data",db.KEY_ALERT,cv);
datab.insert("data",db.KEY_LATITUDE,cv);
datab.insert("data",db.KEY_LONGITUDE,cv);
db.close();
}
});
}
}
- 11-09 03:17:23.939: E/AndroidRuntime(1012): FATAL EXCEPTION: main </n>
- 11-09 03:17:23.939: E/AndroidRuntime(1012): java.lang.NullPointerException
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at com.example.alert.StoringEntire$1.onClick(StoringEntire.java:26)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.view.View.performClick(View.java:4084)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.view.View$PerformClick.run(View.java:16966)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.os.Handler.handleCallback(Handler.java:615)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.os.Handler.dispatchMessage(Handler.java:92)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.os.Looper.loop(Looper.java:137)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at android.app.ActivityThread.main(ActivityThread.java:4745)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at java.lang.reflect.Method.invokeNative(Native Method)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at java.lang.reflect.Method.invoke(Method.java:511)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
- 11-09 03:17:23.939: E/AndroidRuntime(1012): at dalvik.system.NativeStart.main(Native Method)
这些是我正在使用的意图
Intent myIntent = new Intent(AddLocation.this, AddTrigger.class);
myIntent.putExtra("Latitude", ""+ destLatitude);
myIntent.putExtra("Longitude",""+ destLongitude);
而对于另一项活动
Intent Inten = new Intent(AddAlerter.this, AddLocation.class);
Inten.putExtra("alerterName", alerterNameEditText.getText().toString());
startActivity(Inten);