Error while creating an AlertDialog

Question

I'm a beginner in Android. So, I have an icon on clicking that an AlertDialog should appear. Simple.----android:onClick = "onCreateDialog"----

    package com.example.android.guardian;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;


public class MainActivity extends ActionBarActivity {

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

    @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);
    }

    public void onCreateDialog(View v) {
        ImageView image = (ImageView) findViewById(R.id.g_icon);
        image.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog.Builder builder = new AlertDialog.Builder(getApplicationContext());
                // Get the layout inflater
                LayoutInflater inflater = builder.getLayoutInflater();

                // Inflate and set the layout for the dialog
                // Pass null as the parent view because its going in the dialog layout
                builder.setView(inflater.inflate(R.layout.activity_g_pass, null))
                        // Add action buttons
                        .setPositiveButton(R.string.SavePass, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int id) {
                                // sign in the user ...
                            }
                        })
                        .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                            }
                        });
                builder.create();
            }

        });

    }
}

The above code is like a skeleton. No details. I want to implement the above function when clicked i.e to open an AlertDialog. It says cannot resolve getLayoutInflater() method Strings.xml

Guardian

<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string name="title_activity_g_pass">Google</string>
<string name = "cancel">Cancel</string>
<string name = "savePass">Save</string>

this is the logcat

08-17 01:34:22.430  26909-26909/com.example.android.guardian E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.example.android.guardian, PID: 26909
    java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:3829)
            at android.view.View.performClick(View.java:4444)
            at android.view.View$PerformClick.run(View.java:18457)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5047)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3824)
            at android.view.View.performClick(View.java:4444)
            at android.view.View$PerformClick.run(View.java:18457)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5047)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application
            at android.view.ViewRootImpl.setView(ViewRootImpl.java:563)
            at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:260)
            at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
            at android.app.Dialog.show(Dialog.java:286)
            at com.example.android.guardian.MainActivity.onCreateDialog(MainActivity.java:60)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3824)
            at android.view.View.performClick(View.java:4444)
            at android.view.View$PerformClick.run(View.java:18457)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5047)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)

Manifest xml

<?xml version="1.0" encoding="utf-8"?>

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".g_pass"
        android:label="@string/title_activity_g_pass"
        android:parentActivityName=".MainActivity">
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.android.guardian.MainActivity" />
    </activity>
</application>

Answer 1

Replace it with this:

public void onCreateDialog(View v) {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    LayoutInflater inflater = this.getLayoutInflater();
    View view = inflater.inflate(R.layout.activity_main, null);
    builder.setView(view);
    builder.setPositiveButton(R.string.savePass, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int id) {
                // sign in the user ...
            }
        });
    builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int id) {
            }
        });
    AlertDialog dialog = builder.create();
    dialog.show();
    }
}

This will open an AlertDialog when clicking an imageView. In your xml file where your imageView is in, add:

android:onClick="onCreateDialog"

android:clickable="true"

Then go to your strings.xml and change the string "SavePass" to "savePass".