Question

我开发了一个包含2个文本框和1个按钮的布局。首先，按钮出现，两个文本框消失。但是，我不知道如何在按下插入按钮时更改文本框和其他组件的可见性。请解释一下因为我是android的新手。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".Main3Activity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Name"
        android:id="@+id/textView"
        android:visibility="gone" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextName"
        android:visibility="gone" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Address"
        android:id="@+id/textView2"
        android:visibility="gone" />

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/editTextAddress"
        android:visibility="gone" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Insert"
        android:onClick="insert"
        android:id="@+id/button" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textViewResult" />
</LinearLayout>

Main2Activity

package com.example.alan.mainactivity;
import org.apache.http.util.EntityUtils;
import android.content.Intent;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.view.View;
import android.widget.Toast;
import android.view.View.OnClickListener;

public class Main2Activity extends ActionBarActivity {
    public static final String USER_NAME1 = "USERNAME";

    String myJSON;
    private EditText editTextName;
    private EditText editTextAdd;
    private static final String TAG_RESULTS="result";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "name";
    private static final String TAG_ADD ="address";

    JSONArray peoples = null;

    ArrayList<HashMap<String, String>> personList;

    ListView list;



    Button btn_insert=(Button)findViewById(R.id.button);
    btn_insert.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            TextView textView= (TextView)findViewById(R.id.textView);
            textView.setVisibility(View.VISIBLE);

            //Similarly the other views.....
        }
    });



    public void insert(View view){

        String name = editTextName.getText().toString();
        String add = editTextAdd.getText().toString();

        insertToDatabase(name, add);
    }

    private void insertToDatabase(String name, String add){
        class SendPostReqAsyncTask extends AsyncTask<String, Void, String> {
            @Override
            protected String doInBackground(String... params) {
                String paramUsername = params[0];
                String paramAddress = params[1];


                String name = editTextName.getText().toString();
                String add = editTextAdd.getText().toString();
                Intent intent = getIntent();
                String username = intent.getStringExtra(MainActivity.USER_NAME).toString();

                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("name", name));
                nameValuePairs.add(new BasicNameValuePair("address", add));
                nameValuePairs.add(new BasicNameValuePair("user", username));

                try {
                    HttpClient httpClient = new DefaultHttpClient();
                    HttpPost httpPost = new HttpPost(
                            "http://www.oobac.com/app/insert-db.php");
                    httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

                    HttpResponse response = httpClient.execute(httpPost);

                    HttpEntity entity = response.getEntity();


                } catch (ClientProtocolException e) {

                } catch (IOException e) {

                }
                return "success";
            }

            @Override
            protected void onPostExecute(String result) {
                super.onPostExecute(result);

                Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show();
                TextView textViewResult = (TextView) findViewById(R.id.textViewResult);
                textViewResult.setText("Inserted");
            }
        }
        SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
        sendPostReqAsyncTask.execute(name, add);
    }
    //-----------------------
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_profile);

        Intent intent = getIntent();
        String username = intent.getStringExtra(MainActivity.USER_NAME);
        editTextName = (EditText) findViewById(R.id.editTextName);
        editTextAdd = (EditText) findViewById(R.id.editTextAddress);
       TextView textView = (TextView) findViewById(R.id.textView3);

       textView.setText("Welcome " + username);

        list = (ListView) findViewById(R.id.listView);
        personList = new ArrayList<HashMap<String,String>>();
        getData();
    }



    protected void showList(){

        try {
            JSONObject jsonObj = new JSONObject(myJSON);
            peoples = jsonObj.getJSONArray(TAG_RESULTS);

            for(int i=0;i<peoples.length();i++){
                JSONObject c = peoples.getJSONObject(i);
                String id = c.getString(TAG_ID);
                String name = c.getString(TAG_NAME);
                String address = c.getString(TAG_ADD);

                HashMap<String,String> persons = new HashMap<String,String>();

                persons.put(TAG_ID,id);
                persons.put(TAG_NAME,name);
                persons.put(TAG_ADD,address);

                personList.add(persons);
            }

            ListAdapter adapter = new SimpleAdapter(
                    Main2Activity.this, personList, R.layout.list_item,
                    new String[]{TAG_ID,TAG_NAME,TAG_ADD},
                    new int[]{R.id.id, R.id.name, R.id.address}
            );

            list.setAdapter(adapter);

        } catch (JSONException e) {
            e.printStackTrace();
        }

    }

    public void getData(){
        class GetDataJSON extends AsyncTask<String, Void, String>{

            @Override
            protected String doInBackground(String... params) {
                //--------------------------------------------
                Intent intent = getIntent();
                String username = intent.getStringExtra(MainActivity.USER_NAME);
                ArrayList<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("username", username));

                try {
                    HttpClient httpclient = new DefaultHttpClient();
                    HttpPost httppost = new HttpPost("http://www.oobac.com/app/amir.php");
                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs, "UTF-8"));
                    HttpResponse response = httpclient.execute(httppost);
                    String st = EntityUtils.toString(response.getEntity());
                    Log.d("TK SUPPORT", "In the try Loop" + st);
                    myJSON = st;

                } catch (Exception e) {
                    Log.d("TK SUPPORT", "Connection Error : " + e.toString());
                }
                return "OK";



            }

            @Override
            protected void onPostExecute(String result) {
                super.onPostExecute(result);
                showList();
            }



        }

        GetDataJSON g = new GetDataJSON();
        g.execute();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.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();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }


}

Answer 1

    SAMPLE SNIPPET

    replace your onCreate method to this method
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_profile);
        Intent intent = getIntent();
        String username = intent.getStringExtra(MainActivity.USER_NAME);
        editTextName = (EditText) findViewById(R.id.editTextName);
        editTextAdd = (EditText) findViewById(R.id.editTextAddress);
       TextView textView = (TextView) findViewById(R.id.textView3);
 Button btn_insert=(Button)findViewById(R.id.button);
    btn_insert.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            TextView textView= (TextView)findViewById(R.id.textView);
            textView.setVisibility(View.VISIBLE);

            //Similarly the other views.....
        }
    });
       textView.setText("Welcome " + username);

        list = (ListView) findViewById(R.id.listView);
        personList = new ArrayList<HashMap<String,String>>();
        getData();
    }

Answer 2

试试这个：

EditText name = (EditText)findViewById(R.id.editTextName);
name.setVisibility(View.GONE);

Answer 3

声明像这样的类变量

private TextView yourTextView;

您应该像这样获取TextView的实例

yourTextView = (TextView)findViewById(R.id.your_editText);

然后点击按钮，将setVisibility设置为可见

Button mButton = (Button)findViewById(R.id.m_button);
    mButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {               
            yourTextView.setVisibility(View.VISIBLE);
        }
});

隐藏，setVisibility为Gone

yourTextView.setVisibility(View.GONE);

Answer 4

使用setVisibility属性隐藏您的视图。

yourView.setVisibility(View.GONE);

View.GONE此视图不可见，并且不需要任何空间用于布局。

另外

yourView.setVisibility(View.INVISIBLE);

View.INVISIBLE此视图不可见，但仍会占用空间以进行布局。

Answer 5

Button btn_insert=(Button)findViewById(R.id.button);
btn_insert.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

          TextView textView= (TextView)findViewById(R.id.textView);
          textView.setVisibility(View.VISIBLE);

         //Similarly the other views.....
            }
        });

Answer 6

首先，您在布局xml中设置了android:onClick="insert"，并且您也在onCreate方法中设置了点击监听器。因此要么从xml或onCreate侦听器中删除。其次，在onClick中，TextView textView =

(TextView)findViewById(R.id.textView);
textView.setVisibility(View.VISIBLE);

希望这有帮助。

Answer 7

以简单的方式将onClicklistener（）的按钮放在onCreate（）方法中，就像这样..

     @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_user_profile);

            Intent intent = getIntent();
            String username = intent.getStringExtra(MainActivity.USER_NAME);
            editTextName = (EditText) findViewById(R.id.editTextName);
            editTextAdd = (EditText) findViewById(R.id.editTextAddress);
           TextView textView = (TextView) findViewById(R.id.textView3);

 Button btn_insert=(Button)findViewById(R.id.button);
        btn_insert.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                TextView textView= (TextView)findViewById(R.id.textView);
                textView.setVisibility(View.VISIBLE);
                //do it here whatever u want to do on press of button 
                //Similarly the other views.....
            }
        });

           textView.setText("Welcome " + username);

            list = (ListView) findViewById(R.id.listView);
            personList = new ArrayList<HashMap<String,String>>();
            getData();


        }

更改android布局中文本框的可见性

7 个答案: