我有两个 Activiti（Smena 和 Sdacha） 我按下 Smena 上的按钮并打开 Sdacha。我需要将字符串从 textView Sdacha 发送到 Smena。当我按下 Sdacha 上的按钮时，出现错误
public class Sdacha extends Activity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.sdacha);
Button but10=(Button) findViewById(R.id.button10);
but10.setOnClickListener(
new OnClickListener()
{
@Override
public void onClick(View arg0)
{
Intent intent1=new Intent(Sdacha.this,Smena.class);
startActivity(intent1);
}
});
}
}
>
12-25 18:05:40.130: WARN/dalvikvm(378): threadid=1: thread exiting
> with uncaught exception (group=0x40014760) 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): FATAL EXCEPTION: main 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): java.lang.RuntimeException: Unable to start
> activity ComponentInfo{com.example.master/com.example.master.Smena}:
> java.lang.NullPointerException 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1815)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1831)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.ActivityThread.access$500(ActivityThread.java:122) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.ActivityThread$H.handleMessage(ActivityThread.java:1024)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.os.Handler.dispatchMessage(Handler.java:99) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.os.Looper.loop(Looper.java:132) 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): at
> android.app.ActivityThread.main(ActivityThread.java:4123) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> java.lang.reflect.Method.invokeNative(Native Method) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> java.lang.reflect.Method.invoke(Method.java:491) 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> dalvik.system.NativeStart.main(Native Method) 12-25 18:05:40.151:
> ERROR/AndroidRuntime(378): Caused by: java.lang.NullPointerException
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> com.example.hotdog_master.Smena.onCreate(Smena.java:42) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.Activity.performCreate(Activity.java:4397) 12-25
> 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1779)
> 12-25 18:05:40.151: ERROR/AndroidRuntime(378): ... 11 more
Smena Activiti 这是收银员 Smena 活动代码的活动：
public class Smena extends Activity
{
public Nomenklatura Asortiment=new Nomenklatura(100);
public static final String DEBUG_TAG = "myLogs";
ArrayList<String> data =new ArrayList<String> ();
ArrayList<String> data2 =new ArrayList<String> (4);
GridView gvMain;
GridView gvMain2;
ArrayAdapter<String> adapter;
ArrayAdapter<String> adapter2;
double Sum=0;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.smena);
Asortiment=(Nomenklatura) getIntent().getExtras().getSerializable("Nomenklatura");
data2.add("СУММА");
data2.add("0");
data2.add("СДАЧА");
data2.add("0");
adapter = new ArrayAdapter<String>(this, R.layout.item, R.id.tvText, data);
gvMain = (GridView) findViewById(R.id.gridView1);
gvMain.setAdapter(adapter);
adapter2 = new ArrayAdapter<String>(this, R.layout.item2, R.id.tvText, data2);
gvMain2 = (GridView) findViewById(R.id.gridView2);
gvMain2.setAdapter(adapter2);
Button but1=(Button) findViewById(R.id.button1);
but1.setOnClickListener(
new OnClickListener()
{
@Override
public void onClick(View arg0)
{
ButtonOn (1);
}
});
Button but21=(Button) findViewById(R.id.button21);
but21.setOnClickListener(
new OnClickListener()
{
@Override
public void onClick(View arg0)
{
ButtonDel();
}
});
Button but22=(Button) findViewById(R.id.button22);
but22.setOnClickListener(
new OnClickListener()
{
@Override
public void onClick(View arg0)
{
data.clear();
adapter.clear();
}
});
Button but23=(Button) findViewById(R.id.button23);
but23.setOnClickListener(
new OnClickListener()
{
@Override
public void onClick(View arg0)
{
Intent intent1=new Intent(Smena.this,Login.class);
// intent1.putExtra("Sdacha", Asortiment);
startActivity(intent1);
}
});
}
private void ButtonDel()
{
int cnt= data.size();
data.remove(cnt-1);
data.remove(cnt-2);
adapter = new ArrayAdapter<String>(this, R.layout.item, R.id.tvText, data);
gvMain.setAdapter(adapter);
}
private void ButtonOn (int Art)
{
String name= Asortiment.name.get(1);
String price= Asortiment.price.get(1).toString();
data.add(name);
data.add(price);
adapter = new ArrayAdapter<String>(this, R.layout.item, R.id.tvText, data);
gvMain.setAdapter(adapter);
}
private void CheckSum()
{
Sum=0;
for(int k=1;k<data.size();k=k+2)
{
Sum=Sum+Double.parseDouble(data.get(k));
}
}
}