Android - 从customListview中获取值

-1

我在我的customlistview的每一行中都有一个edittext，用户输入产品数量（在adapter.java页面中）。其他值从database.Id中设置。我想要获取edittext的值在每行按钮（Activity.java）上单击。我尝试使用sharedpreference.But得到空指针异常，行Bundle qbdl = new Bundle（）;。Android - 从customListview中获取值

MainActivity.java

public class add2cart extends Activity{ 
public static ListView adlstvw; 
ListView adlstvw; 
Button btn,remove_btn; 
SQLiteDatabase mydb; 
public static String sme,dl; 
public String bl; 
SharedPreferences sp; 
SharedPreferences.Editor spe; 
String qty=CartAdapter.s2; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.add2crt); 
    adlstvw=(ListView)findViewById(R.id.lstvw_add2crt); 
    btn=(Button)findViewById(R.id.place_order); 

    Bundle bundl = getIntent().getExtras(); 
    Bundle bodl=getIntent().getExtras(); 

    if (bodl!=null) { 
     dl=bodl.getString("dts"); 
    } 


    if (bundl != null) { 
    sme= bundl.getString("dtls"); 

    } 


    mydb=add2cart.this.openOrCreateDatabase("addcart", MODE_PRIVATE, null); 
    mydb.execSQL("CREATE TABLE IF NOT EXISTS add2cart(usr TEXT,img BLOB,pnme TEXT,prate NUMERIC,pqty NUMERIC,ptotl NUMERIC)"); 
    Cursor cr = mydb.rawQuery("SELECT * FROM add2cart WHERE usr='"+sme+"' OR usr='"+dl+"'", null); 
    String [] pname = new String[cr.getCount()]; 
    String [] price = new String[cr.getCount()]; 

    int i = 0; 
    while(cr.moveToNext()) 
    { 
     String name = cr.getString(cr.getColumnIndex("pnme")); 
     String prprice = cr.getString(cr.getColumnIndex("prate")); 
     pname[i] = name; 
     price[i] = prprice; 
     i++; 
    } 
    CartAdapter cart=new CartAdapter(this,pname,price); 
    adlstvw.setAdapter(cart); 

    btn.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 


      ///////////////////////// 
      String qty=sp.getString("quty", null); 


      Intent in=new Intent(add2cart.this,buy_ltr.class); 
      Bundle bod=new Bundle(); 
      Bundle bndl = new Bundle(); 

      //////////////// 
      Bundle qbdl=new Bundle(); 
      qbdl.putString("prqt", qty); 
      in.putExtras(qbdl); 


      bod.putString("kew", dl); 
      in.putExtras(bod); 
      bndl.putString("som",sme); 
      in.putExtras(bndl); 
      startActivity(in); 

     } 
    }); 

} 

}

CartAdapter.java

logcat的

02-09 04:13:50.705: E/AndroidRuntime(8978): FATAL EXCEPTION: main 
02-09 04:13:50.705: E/AndroidRuntime(8978): Process: com.power.it.solar, PID: 8978 
02-09 04:13:50.705: E/AndroidRuntime(8978): java.lang.NullPointerException 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at com.power.it.solar.add2cart$1.onClick(add2cart.java:76) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.view.View.performClick(View.java:4424) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.view.View$PerformClick.run(View.java:18383) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.os.Handler.handleCallback(Handler.java:733) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.os.Handler.dispatchMessage(Handler.java:95) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.os.Looper.loop(Looper.java:137) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at android.app.ActivityThread.main(ActivityThread.java:4998) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at java.lang.reflect.Method.invoke(Method.java:515) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593) 
02-09 04:13:50.705: E/AndroidRuntime(8978):  at dalvik.system.NativeStart.main(Native Method)

enter image description here

来源

2015-02-09 droid

其价值要访问：在您的适配器您的EditText视图

et.setTag("tagname");

方法，然后通过标签一样得到你的按钮侦听价值在'btn'按钮上单击？ – 2015-02-09 06:17:57

adepter中的名称没有意义，所以请让我知道哪个变量保持数量值？ – 2015-02-09 06:33:35

使用'SharedPreferences'设置Button上的值单击 – 2015-02-09 07:15:13

我认为你可以使用：

if(v.gettag().equals("tagname")){ 
//Write your code 
}

来源

2015-02-09 09:24:41

Android - 从customListview中获取值

回答

相关问题