Ihave tried this code while extending Activity and it's run (Y) but when extending fragment as I paste here it give me this exception :
java.lang.IllegalStateException: Could not find a method scanQR(View) in the acttyivity class com.example.pc_orbit.myapplication.Citizen for onClick handler on view class android.widget.Button with id 'scanner'
public class Report extends Fragment
{
static final String ACTION_SCAN = "com.google.zxing.client.android.SCAN";
@Override
public View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container,@Nullable Bundle savedInstanceState){
// String s= getIntent().getExtras().getString("info");
View v= inflater.inflate(R.layout.report, container, false);
return v;
}
public void scanQR(View v) {
try {
//start the scanning activity from the com.google.zxing.client.android.SCAN intent
Intent intent = new Intent(ACTION_SCAN);
intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
startActivityForResult(intent, 0);
} catch (ActivityNotFoundException anfe) {
//on catch, show the download dialog
showDialog(getActivity(), "No Scanner Found", "Download a scanner code activity?", "Yes", "No").show();
}
}
private static AlertDialog showDialog(final Activity act, CharSequence title, CharSequence message, CharSequence buttonYes, CharSequence buttonNo) {
AlertDialog.Builder downloadDialog = new AlertDialog.Builder(act);
downloadDialog.setTitle(title);
downloadDialog.setMessage(message);
downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
Uri uri = Uri.parse("market://search?q=pname:" + "com.google.zxing.client.android");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
try {
act.startActivity(intent);
} catch (ActivityNotFoundException anfe) {
}
}
});
downloadDialog.setNegativeButton(buttonNo, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
}
});
return downloadDialog.show();
}
//on ActivityResult method
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == Activity.RESULT_OK) {
//get the extras that are returned from the intent
String contents = intent.getStringExtra("SCAN_RESULT");
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
Toast toast = Toast.makeText(getActivity(), "Content:" + contents + " Format:" + format, Toast.LENGTH_LONG);
toast.show();
}
}
}
}
and this is the code which had run while extending Activity
import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;
public class AndroidQrCodeExample extends Activity {
static final String ACTION_SCAN = "com.google.zxing.client.android.SCAN";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void scanQR(View v) {
try {
//start the scanning activity from the com.google.zxing.client.android.SCAN intent
Intent intent = new Intent(ACTION_SCAN);
intent.putExtra("SCAN_MODE", "QR_CODE_MODE");
startActivityForResult(intent, 0);
} catch (ActivityNotFoundException anfe) {
//on catch, show the download dialog
showDialog(AndroidQrCodeExample.this, "No Scanner Found", "Download a scanner code activity?", "Yes", "No").show();
}
}
private static AlertDialog showDialog(final Activity act, CharSequence title, CharSequence message, CharSequence buttonYes, CharSequence buttonNo) {
AlertDialog.Builder downloadDialog = new AlertDialog.Builder(act);
downloadDialog.setTitle(title);
downloadDialog.setMessage(message);
downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
Uri uri = Uri.parse("market://search?q=pname:" + "com.google.zxing.client.android");
Intent intent = new Intent(Intent.ACTION_VIEW, uri);
try {
act.startActivity(intent);
} catch (ActivityNotFoundException anfe) {
}
}
});
downloadDialog.setNegativeButton(buttonNo, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialogInterface, int i) {
}
});
return downloadDialog.show();
}
//on ActivityResult method
public void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == 0) {
if (resultCode == RESULT_OK) {
//get the extras that are returned from the intent
String contents = intent.getStringExtra("SCAN_RESULT");
String format = intent.getStringExtra("SCAN_RESULT_FORMAT");
Toast toast = Toast.makeText(this, "Content:" + contents + " Format:" + format, Toast.LENGTH_LONG);
toast.show();
}
}
}
}
the xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:background="#ffffff"
android:orientation="vertical"
tools:context="com.javacodegeeks.androidstartactivityforresultexample.ActivityOne" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center|top"
android:layout_margin="20dp"
android:text="Scan"
android:textColor="#000000"
android:textSize="30dp" />
<Button
android:id="@+id/scanner"
android:layout_width="250dp"
android:layout_height="80dp"
android:layout_gravity="center"
android:layout_margin="10dp"
android:gravity="center"
android:onClick="scanQR"
android:text="QR Code"
android:textSize="18dp" >
</Button>
<Button
android:id="@+id/scanner2"
android:layout_width="250dp"
android:layout_height="80dp"
android:layout_gravity="center"
android:layout_margin="10dp"
android:gravity="center"
android:onClick="scanBar"
android:text="Bar Code"
android:textSize="18dp" >
</Button>
</LinearLayout>The click gonna be fired in the activity but not in the fragment. Because you have only 2 buttons in your layout (and because I think it's the best practice)
I suggest you to set the button listener in the onCreate method of the fragment.
public class Report extends Fragment implements View.OnClickListener{
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.report, container, false);
Button scannerButton = (Button) v.findViewById(R.id.scanner);
Button scanner2Button = (Button) v.findViewById(R.id.scanner2);
scannerButton.setOnClickListener(this);
scanner2Button.setOnClickListener(this);
return v;
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.scanner) {
scanQR(v);
} else if (v.getId() == R.id.scanner2) {
scanBar(v);
}
}