使用对话框

Question

这里我试图通过弹出对话框来保存数据并将数据保存到SQLite数据库中点击listview项目（每个listview项目包含textView和toggle按钮，适配器生成的类似8项。

对话框包含edittext字段，在输入数据并单击“确定”按钮时应创建数据库，同样应该是textview项listview的文本。

•我在更改textView项listview的数据以及设置数据库时遇到问题。任何建议都会有很大的帮助谢谢...

MainActivity.java

public class MainActivity extends ActionBarActivity implements
        ListAdapter.customButtonListener {
    String ipaddress, ipaddress1;
    SharedPreferences sharedpreferences;
    EditText ed1,ed2;
    private ListView listView;
    public static final String MY_PREFERENCES = "MyPreferences";
    SharedPreferences myPreferences;
    ListAdapter adapter;
    ArrayList<String> dataItems = new ArrayList<String>();
    ProgressDialog waitDialog;
    AlertDialog.Builder alert;
    String noteID;
    TextView child;
    NoteHelper helper;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String[] dataArray = getResources().getStringArray(R.array.listdata);
        List<String> dataTemp = Arrays.asList(dataArray);
        dataItems.addAll(dataTemp);
        ed1 = (EditText) findViewById(R.id.editText);
        helper=new NoteHelper(this);
        child=(TextView)findViewById(R.id.childTextView);
        //alert = new AlertDialog.Builder(this);
        listView = (ListView) findViewById(R.id.listView);
        adapter = new ListAdapter(MainActivity.this, dataItems);
        adapter.setCustomButtonListner(MainActivity.this);
        listView.setAdapter(adapter);
        registerForContextMenu(listView);
        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> adapterView, View view, final int i, long l) {
            final Dialog dialog = new Dialog(MainActivity.this);
            WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
            lp.copyFrom(dialog.getWindow().getAttributes());
            lp.width = WindowManager.LayoutParams.MATCH_PARENT;
            lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
            dialog.show();
            dialog.getWindow().setAttributes(lp);
            dialog.setContentView(R.layout.prompts);
            dialog.setTitle("Update!!!");
            final EditText userinput=(EditText)dialog.findViewById(R.id.editTextDialogUserInput);

            Button Update = (Button) dialog.findViewById(R.id.dialogButtonOK);
            Button Cancel=(Button)dialog.findViewById(R.id.dialogButtonCANCEL);

            Update.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    if (userinput.getText() != null) {
                        String text=userinput.getText().toString();
                        //child.setText(userinput.getText().toString());
                        myPreferences = getSharedPreferences (MY_PREFERENCES, Context.MODE_PRIVATE);
                        SharedPreferences.Editor editor = myPreferences.edit ();
                        editor.putString(MY_PREFERENCES,text);
                        editor.commit ();

                        myPreferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);

                        String strUsername = myPreferences.getString(MY_PREFERENCES,text);
                        // child.setText(strUsername);
                        Toast.makeText(MainActivity.this, ""+userinput.getText()+"uploaded successfully", Toast.LENGTH_SHORT).show();
                    }

                }
            });

            Cancel.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    dialog.dismiss();
                }
            });
            dialog.show();
            return true;

        }
    });
}

ListAdapter.java

public class ListAdapter extends ArrayAdapter<String> {
    customButtonListener customListner;

    public interface customButtonListener {
        public void onButtonClickListner(int position,String value);
        public void onClickListner(int position, String temp);
    }

    public void setCustomButtonListner(customButtonListener listener) {
        this.customListner = listener;
    }

    private Context context;
    private ArrayList<String> data = new ArrayList<String>();

    public ListAdapter(Context context, ArrayList<String> dataItem) {
        super(context, R.layout.row, dataItem);
        this.data = dataItem;
        this.context = context;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
      final  ViewHolder viewHolder;
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(context);
            convertView = inflater.inflate(R.layout.row, null);
            viewHolder = new ViewHolder();
            viewHolder.text = (TextView) convertView.findViewById(R.id.childTextView);
            viewHolder.button = (Button) convertView.findViewById(R.id.childButton);
            viewHolder.buttonoff = (Button) convertView.findViewById(R.id.childButton1);
            convertView.setTag(viewHolder);
        }
        else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        final String temp = getItem(position);
        viewHolder.text.setText(temp);
        viewHolder.button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                if (customListner != null) {
                    customListner.onButtonClickListner(position,temp);
                }
            }
        });
        viewHolder.buttonoff.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                if (customListner != null) {
                    customListner.onClickListner(position, temp);
                }
            }
        });
        return convertView;
    }

    public class ViewHolder {
        TextView text;
        Button button;
        Button buttonoff;
    }
}

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <ListView
        android:id="@+id/listView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_below="@+id/editText"
        >
    </ListView>

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:hint="IP ADDRESS"
        android:textAlignment="center"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

row.xml

<TextView
    android:id="@+id/childTextView"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:editable="true"
    android:layout_alignParentLeft="true"
    android:layout_toStartOf="@+id/childButton" />

<Button
    android:id="@+id/childButton"
    android:layout_width="55dp"
    android:layout_height="55dp"
    android:text="ON"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_marginEnd="61dp" />

<Button
    android:id="@+id/childButton1"
    android:layout_width="55dp"
    android:layout_height="55dp"
    android:text="OFF"
    android:layout_alignTop="@+id/childButton"
    android:layout_alignParentEnd="true" />

prompts.xml

<EditText
    android:id="@+id/editTextDialogUserInput"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:editable="true"
    android:layout_alignParentStart="true">
    <requestFocus/>
</EditText>
<Button
    android:id="@+id/dialogButtonOK"
    android:layout_width="105dp"
    android:layout_height="60dp"
    android:text="UPDATE"
    android:layout_marginRight="5dp"
    android:layout_marginStart="56dp"
    android:layout_below="@+id/editTextDialogUserInput"
    android:layout_alignParentStart="true" />

<Button
    android:id="@+id/dialogButtonCANCEL"
    android:layout_width="105dp"
    android:layout_height="60dp"
    android:text=" CANCEL "
    android:layout_marginRight="5dp"
    android:layout_below="@+id/editTextDialogUserInput"
    android:layout_toEndOf="@+id/dialogButtonOK" />

MainActivity.java

下面是listView

项中按钮的onClickListener代码

@Override
public void onClickListner(int position, String temp,View view) {
    int position1 = Integer.parseInt(view.getTag().toString());

    final Dialog dialog1 = new Dialog(MainActivity.this);
    WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
    lp.copyFrom(dialog1.getWindow().getAttributes());
    lp.width = WindowManager.LayoutParams.MATCH_PARENT;
    lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
    dialog1.show();
    dialog1.getWindow().setAttributes(lp);
    dialog1.setContentView(R.layout.prompts);
    dialog1.setTitle("Update!!!");
    final EditText userinput=(EditText)dialog1.findViewById(R.id.editTextDialogUserInput);

    Button Update = (Button) dialog1.findViewById(R.id.dialogButtonOK);
    Button Cancel=(Button)dialog1.findViewById(R.id.dialogButtonCANCEL);

    Update.setOnClickListener(new OnClickListener() {
        @Override
        public void onClick(View v) {
            //int position = Integer.parseInt(v.getTag().toString());
            String text=userinput.getText().toString();
            if(text!=null) {
                // If you want to find the textView sibling of the button you clicked and change its text
                //Null pointer exception occured
                ((TextView) ((View) v.getParent()).findViewById(R.id.childTextView)).setText(text);
            }
        }
    });
}

Answer 1

在您的活动中设置onClick方法并将其挂钩到xml中。像这样的东西

<Button
     android:id="@+id/childButton1"
     android:layout_width="55dp"
     android:layout_height="55dp"
     android:text="OFF"
     android:onclick="onChildButton1"
     android:layout_alignTop="@+id/childButton"
     android:layout_alignParentEnd="true" />

在listView适配器实现中为此按钮设置标记

    holder.childButton1.setTag(position);

您可以将与此行相关的任何信息设置为执行点击操作时可能需要的标记。

在您的活动中实施具有listView

的方法

 public void onChildButton1(View view) {
       // Do your Dialog action here
       // If you want to figure out the position of the item of button just do this
      int position = Integer.parseInt(view.getTag().toString())

      // If you want to find the textView sibling of the button you clicked and change its text
      ((TextView)((View) view.getParent()).findViewById(R.id.text_view_id)).setText("Your string");

 }

修改

您需要获取列表项的TextView而不是对话框提示

该功能应如下所示。

public void onChildButton1 (final View childButton1) {
final Dialog dialog1 = new Dialog(MainActivity.this);
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
lp.copyFrom(dialog1.getWindow().getAttributes());
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
dialog1.show();
dialog1.getWindow().setAttributes(lp);
dialog1.setContentView(R.layout.prompts);
dialog1.setTitle("Update!!!");
final EditText userinput=(EditText)dialog1.findViewById(R.id.editTextDialogUserInput);

Button Update = (Button) dialog1.findViewById(R.id.dialogButtonOK);
Button Cancel=(Button)dialog1.findViewById(R.id.dialogButtonCANCEL);

Update.setOnClickListener(new OnClickListener() {
    @Override
    public void onClick(View v) {

            //int position = Integer.parseInt(v.getTag().toString());
            String text=userinput.getText().toString();
        if(text!=null) {
            // If you want to find the textView sibling of the button you clicked and change its text

            //Null pointer exception resolved
            ((TextView) ((View) childButton1.getParent()).findViewById(R.id.childTextView)).setText(text);


        }
    }
});
}