这是我的Java文件，我没有获得正确的title值传递给localweb 通过此行发送值
.appendQueryParameter（“ Title”，textviewtitle.setText（title）;）
我使用什么参数发送正确的值而不是上面的行，该文件从另一个活动获取意图数据，但是在textview中它显示正确的标题并且没有发送正确的值作为参数
fullview.java
package com.desktop.app;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static android.support.v7.app.AlertDialog.*;
import static com.desktop.app.Stitle.EXTRA_AUTHOR;
import static com.desktop.app.Stitle.EXTRA_HR;
import static com.desktop.app.Stitle.EXTRA_PUBLISHER;
import static com.desktop.app.Stitle.EXTRA_PUBY;
import static com.desktop.app.Stitle.EXTRA_RAK;
import static com.desktop.app.Stitle.EXTRA_STATUS;
import static com.desktop.app.Stitle.EXTRA_TITLE;
import static com.desktop.app.Stitle.EXTRA_VR;
public class fullview extends AppCompatActivity {
Button location, avail, request;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fullview);
Intent intent = getIntent();
String title = intent.getStringExtra(EXTRA_TITLE);
String author = intent.getStringExtra(EXTRA_AUTHOR);
String publisher = intent.getStringExtra(EXTRA_PUBLISHER);
int puby = intent.getIntExtra(EXTRA_PUBY,0);
final int rak = intent.getIntExtra(EXTRA_RAK,0);
final int hr = intent.getIntExtra(EXTRA_HR,0);
final int vr = intent.getIntExtra(EXTRA_VR,0);
final String status = intent.getStringExtra(EXTRA_STATUS);
TextView textviewtitle = findViewById(R.id.textviewtitle);
TextView textViewAuthor = findViewById(R.id.textviewauthors);
TextView textViewPublisher = findViewById(R.id.textviewpublisher);
TextView textViewPuby = findViewById(R.id.textviewpubyear);
textviewtitle.setText(title);
textViewAuthor.setText(author);
textViewPublisher.setText(publisher);
textViewPuby.setText(String.valueOf(puby));
location = findViewById(R.id.loc);
location.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// AlertDialog.Builder a_builder = new AlertDialog.Builder(fullview.this);
// a_builder.setMessage("Location");
{
AlertDialog.Builder builder=new AlertDialog.Builder(fullview.this);
builder.setTitle("Location");
builder.setMessage("Rak-No :: " + rak + "\nColumn :: " + hr +"\nRow :: " + vr);
AlertDialog alertDialog=null;
builder.setPositiveButton("Close", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(fullview.this,"Closed",Toast.LENGTH_SHORT).show();
}
});//.setNegativeButton("no", new DialogInterface.OnClickListener() {
// @Override
// public void onClick(DialogInterface dialog, int which) {
//
// }
// });
alertDialog=builder.create();
alertDialog.show();
}
}
});
avail = findViewById(R.id.avail);
avail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view)
{
AlertDialog.Builder builder=new AlertDialog.Builder(fullview.this);
{
if (status.equals("yes")) {
builder.setTitle("Availablity");
builder.setMessage("Available");
} else {
builder.setTitle("Availablity");
builder.setMessage("Not Available");
}
}
AlertDialog alertDialog=null;
builder.setPositiveButton("Close", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
Toast.makeText(fullview.this,"Closed",Toast.LENGTH_SHORT).show();
}
});
alertDialog=builder.create();
alertDialog.show();
}
});
request= findViewById(R.id.request);
request.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
request();
}
});
}
private void request(){
//String url= "http://192.168.0.136/fyp/bookreq.php";
final RequestQueue requestQueue = Volley.newRequestQueue(fullview.this);
Uri.Builder builder=new Uri.Builder();
builder.scheme("http")
.authority("192.168.0.136")
.appendPath("fyp")
.appendPath("bookreq.php")
.appendQueryParameter("Title",textviewtitle.setText(title););
Log.i("Info",textviewtitle.setText(title););
StringRequest stringRequest = new StringRequest(Request.Method.POST, builder.build().toString(), new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response.trim().equals("successfull")){
Toast.makeText(getApplicationContext(), "Go to Admin For Approval",Toast.LENGTH_LONG).show();
Intent in = new Intent(fullview.this,Search.class);
startActivity(in);
}
else {
Toast.makeText(getApplicationContext(), "Already Requested",Toast.LENGTH_LONG).show();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "error:" +error.toString() ,Toast.LENGTH_LONG).show();
}
});
requestQueue.add(stringRequest);
}
}
06-25 08：35：33.436 2682-2682 / com.desktop.app W / IInputConnectionWrapper：非活动InputConnection上的finishComposedText
06-25 08：35：35.449 2682-2737 / com.desktop.app I / Info：标题
这是信息显示值标题，而不是正确的值
06-25 08：35：30.507 2682-2682 / com.desktop.app I / Info：{“ ss”：true，“ search”：[{“ isbn”：195472462，“ title”：“ Oxford Practice Grammer”，“ authors”：“ john Eastwood”，“ accession”：1，“ publisher”：“ Ameena Saiyid Oxford University”，“ pubyear”：2014，“ pages”：432，“ rak”：1，“ hr” ：1，“ vr”：1，“条形码”：195472462，“ status”：“是”}，{“ isbn”：9694946719，“ title”：“高中英语Grammer”，“ authors”：“ Wren，Martin “，” accession“：4，” publisher“：” Paramount Publishing“，” pubyear“：2010，” pages“：418，” rak“：1，” hr“：1，” vr“：4，” barcode“ ：9694946719，“状态”：“是”}]} 06-25 08：35：30.585 2682-2682 / com.desktop.app W / IInputConnectionWrapper：非活动InputConnection上的finishComposedText 非活动InputConnection上的finishComposedText
这是我在上述信息中获得的正确标题
答案 0 :(得分：0)
当应用程序尝试使用NullPointerException 具有空值的对象引用。
首先，请确保设置 PROPER ID 。
TextView textviewtitle; // Global
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fullview);
textviewtitle = findViewById(R.id.textviewtitle); // Check this id
注意
appendQueryParameter（字符串键， 字符串值）
您应该设置
.appendQueryParameter("Title",textviewtitle.getText().toString());