Android null pointer exception while passing value to another application

Question

public String name, email, phone;
NotificationCompat.Builder notification1;

Button aprv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    aprv=(Button)findViewById(R.id.btnapp);
    Bundle bundle=getIntent().getExtras();

    name=bundle.getString("Name");.......................##
    email=bundle.getString("Email");
    phone=bundle.getString("Phone");

    TextView textView1=(TextView)findViewById(R.id.tv1);
    TextView textView2=(TextView)findViewById(R.id.tv2);
    TextView textView3=(TextView)findViewById(R.id.tv3);
    textView1.setText(name);
    textView2.setText(email);
    textView3.setText(phone);

Null pointer exception shown in the line with hashtags.

Here's the intent code in another activity. I set the manifest correctly.

Intent intent = new Intent("com.example.user.adminapp.Main2Activity");
intent.putExtra("Name", name);
intent.putExtra("Email", email);
intent.putExtra("Phone", phone);
startActivity(intent);

Take a look here: https://stackoverflow.com/questions/2091465/how-do-i-pass-data-between-activities-in-android-application — Satan Pandeya, Jun 01 '17 at 03:56
Process: com.example.user.adminapp, PID: 11571 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.user.adminapp/com.example.user.adminapp.Main2Activity}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2436) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2498) at android.app.ActivityThread.access$900(ActivityThread.java:179) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:132 — , Jun 01 '17 at 04:20
4) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5641) 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:1288) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1104) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at com.example.user.adminapp.Main2Activity.onCreate(Main2Activity.java400) at — , Jun 01 '17 at 04:20
:30) at android.app.Activity.performCreate(Activity.java:5484) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1093) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2 — , Jun 01 '17 at 04:20

Trupti Nasit · Answer 1 · 2017-06-01T05:24:02.213

1

Try this, it may work for you,

Intent intent = new Intent(YOUR_ACTIVITY.this,Main2Activity.class);

edited Jun 01 '17 at 05:24

answered Jun 01 '17 at 05:08

Trupti Nasit

177
2
15

score 0 · Answer 2 · answered Jun 01 '17 at 04:18

0

Activity which you are opening through another application Suppose its Name is Main2Activity.java

Step 1:

AndroidManifest.xml

 <activity android:name="com.example.user.adminapp.Main2Activity">

            <intent-filter>
                <action android:name="com.example.user.SOMETHING_USEFUL"/>
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

your Intent

 Intent intent = new Intent("com.example.user.SOMETHING_USEFUL");
        intent.putExtra("Name", name);
        intent.putExtra("Email", email);
        intent.putExtra("Phone", phone);
        startActivity(intent);

Your Main2Activity.java

Button aprv;
String name="";
String email="";
String phone="";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    aprv=(Button)findViewById(R.id.btnapp);
    if(getIntent().getStringExtra("Name")!=null)
{
   name=getIntent().getStringExtra("Name");
email=getIntent().getStringExtra("Email");
phone=getIntent().getStringExtra("Phone");
}

    TextView textView1=(TextView)findViewById(R.id.tv1);
    TextView textView2=(TextView)findViewById(R.id.tv2);
    TextView textView3=(TextView)findViewById(R.id.tv3);
    textView1.setText(name);
    textView2.setText(email);
    textView3.setText(phone);

answered Jun 01 '17 at 04:18

MageNative

682
5
14

thanks.. but it doesnot show the values in main2Activity – Jun 01 '17 at 04:30
toast the values in Main2Activity.java – MageNative Jun 01 '17 at 04:32
Toast.makeText(getApplicationContext(),name,Toast.LENGTH_LONG).show(); – MageNative Jun 01 '17 at 04:32
add this line in the if condition and launch the the activity through another application. – MageNative Jun 01 '17 at 04:33
is there any way to post the whole gradle file here?/ – Jun 01 '17 at 04:33
edit your question and post the gradle file. – MageNative Jun 01 '17 at 04:34
btn1=(Button)findViewById(R.id.btnview); btn1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent=new Intent(MainActivity.this, Main2Activity.class); startActivity(intent); } – Jun 01 '17 at 04:36
Intent intent = new Intent("com.example.user.SOMETHING_USEFUL"); intent.putExtra("Name", name); intent.putExtra("Email", email); intent.putExtra("Phone", phone); startActivity(intent); – MageNative Jun 01 '17 at 04:37
use this in your onclick – MageNative Jun 01 '17 at 04:38

Android null pointer exception while passing value to another application

2 Answers2