點擊後小窗口打開即可開啓全選活動

Question

main xml file 
<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:showIn="@layout/activity_main" tools:context=".MainActivity"> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="ADD CONTACT" 
     android:id="@+id/btnadd" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="97dp" 
     android:onClick="addContact"/> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="VIEW CONTACT" 
     android:id="@+id/btnview" 
     android:layout_centerVertical="true" 
     android:layout_centerHorizontal="true" 
     android:onClick="viewContact"/> 

    <TextView 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="No Network Found" 
     android:id="@+id/textview" 
     android:layout_below="@+id/btnview" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="55dp" /> 
</RelativeLayout> 





main java file 
    package com.example.dota.databasephp; 

    import android.app.Activity; 
    import android.content.Context; 
    import android.content.Intent; 
    import android.net.ConnectivityManager; 
    import android.net.NetworkInfo; 
    import android.os.Bundle; 
    import android.view.View; 
    import android.widget.Button; 
    import android.widget.TextView; 

    public class MainActivity extends Activity implements View.OnClickListener { 


     Button btnadd,btnview; 
     TextView textView; 


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

      btnadd = (Button) findViewById(R.id.btnadd); 
      btnview = (Button) findViewById(R.id.btnview); 
      textView = (TextView) findViewById(R.id.textview); 
      btnadd.setOnClickListener(this); 
      ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 
      NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo(); 

      if (networkInfo != null && networkInfo.isConnected()) 
      { 
       textView.setVisibility(View.INVISIBLE); 

      } 
      else { 
       btnadd.setEnabled(false); 
       btnview.setEnabled(false); 
      } 
     } 


     @Override 
     public void onClick(View v) { 
      Intent i=new Intent(MainActivity.this,Addinfo.class); 
      startActivity(i); 
     } 


    } 



addinfo xml file 

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:showIn="@layout/activity_addinfo" 
    tools:context="com.example.dota.databasephp.Addinfo"> 
    <EditText 
     android:layout_width="250dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/et_name" 
     android:layout_alignParentTop="true" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="59dp" 
     android:text="Enter Name" /> 

    <EditText 
     android:layout_width="250dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/et_email" 
     android:text="Enter Email" 
     android:layout_below="@+id/et_name" 
     android:layout_alignLeft="@+id/et_name" 
     android:layout_alignStart="@+id/et_name" 
     android:layout_marginTop="34dp" 
     android:inputType="textEmailAddress"/> 

    <EditText 
     android:layout_width="250dp" 
     android:layout_height="wrap_content" 
     android:id="@+id/et_mobile" 
     android:text="Enter Mobile" 
     android:layout_below="@+id/et_email" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="37dp" 
     android:inputType="phone"/> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="SAVE DATA" 
     android:id="@+id/button" 
     android:layout_below="@+id/et_mobile" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="78dp" 
     android:onClick="saveInfo"/> 

</RelativeLayout> 


addinfo java file 
package com.example.dota.databasephp; 

import android.app.Activity; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.Toast; 

import java.io.BufferedWriter; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLEncoder; 

public class Addinfo extends Activity { 
    EditText Name,Email,Mobile; 
    String name,email,mobile; 
    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_addinfo); 
     Name=(EditText)findViewById(R.id.et_name); 
     Email=(EditText)findViewById(R.id.et_email); 
     Mobile=(EditText)findViewById(R.id.et_mobile); 

     BackgroundTask backgroundTask=new BackgroundTask(); 
     backgroundTask.execute(name,email,mobile); 
     finish(); 
    } 
    public void saveInfo(View view) 
    { 
     name= Name.getText().toString(); 
     email=Email.getText().toString(); 
     mobile=Mobile.getText().toString(); 
    } 

    class BackgroundTask extends AsyncTask<String, String, String> 
    { 
     String add_info_url; 

     @Override 
     protected void onPreExecute() { 
      add_info_url="Domain_name/add_info.php"; 
     } 

     @Override 
     protected String doInBackground(String... params) { 
      String name,email,mobile; 
      name=params[0]; 
      email=params[1]; 
      mobile=params[2]; 
      try { 
       URL url=new URL(add_info_url); 
       HttpURLConnection httpURLConnection= (HttpURLConnection)url.openConnection(); 
       httpURLConnection.setRequestMethod("POST"); 
       httpURLConnection.setDoOutput(true); 
       OutputStream outputStream=httpURLConnection.getOutputStream(); 
       BufferedWriter bufferedWriter= new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8")); 
       String data_string= URLEncoder.encode("name", "UTF-8")+"="+URLEncoder.encode(name,"UTF-8")+"="+ 
         URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8")+"="+ 
         URLEncoder.encode("mobile","UTF-8")+"="+URLEncoder.encode(mobile,"UTF-8"); 
       bufferedWriter.write(data_string); 
       bufferedWriter.flush(); 
       bufferedWriter.close(); 
       outputStream.close(); 
       InputStream inputStream=httpURLConnection.getInputStream(); 
       inputStream.close(); 
       httpURLConnection.disconnect(); 

       return "One row of data inserted"; 


      } catch (MalformedURLException e) { 
       e.printStackTrace(); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 

      return null; 
     } 

     @Override 
     protected void onPostExecute(String result) { 
      Toast.makeText(getApplicationContext(), result, Toast.LENGTH_LONG).show(); 
     } 

     @Override 
     protected void onProgressUpdate(String... values) { 
      super.onProgressUpdate(values); 
     } 
    } 

} 

執行此代碼後，當我點擊添加聯繫人按鈕時會出現一個非常小的框。那個小盒子是什麼？我不明白爲什麼這個盒子出現在執行中。請運行代碼，您將會知道問題所在。

Answer 1

您是通過調用onCreate()finish()摧毀你的Addinfo活動。

嘗試刪除這一行：

finish(); 

從Addinfo活動onCreate()。