Calling one Activity from another in Android

Question

How can I call another activity from one (the current) activity?

And for the same I want to call an activity which contains a dialog message box from my current activity.

Answer 1

First question:

Use the Intent to call another Activity. In the Manifest, you should add

<activity android:name="ListViewImage"></activity> <activity android:name="com.company.listview.ListViewImage"> </activity> 

And in your current activity,

btListe = (ImageButton)findViewById(R.id.Button_Liste);     btListe.setOnClickListener(new OnClickListener()     {    public void onClick(View v)         {             intent = new Intent(main.this, ListViewImage.class);             startActivity(intent);             finish();         }     }); 

Second question:

sendButton.setOnClickListener(new OnClickListener() {         public void onClick(View v) {             String valueString = editValue.getText().toString();             long value;             if (valueString != null) {                 value = Long.parseLong(valueString);             }             else {                 value = 0;             }              Bundle sendBundle = new Bundle();             sendBundle.putLong("value", value);              Intent i = new Intent(Activity1.this, Activity2.class);             i.putExtras(sendBundle);             startActivity(i);              finish();         }     }); 

and in Activity2:

 Bundle receiveBundle = this.getIntent().getExtras();     final long receiveValue = receiveBundle.getLong("value");     receiveValueEdit.setText(String.valueOf(receiveValue));     callReceiverButton.setOnClickListener(new OnClickListener() {         public void onClick(View v) {             Intent i = new Intent(Activity2.this, Receiver.class);             i.putExtra("new value", receiveValue - 10);         }     }); 

Answer 2

check the following code to call one activity from another.

Intent intent = new Intent(CurrentActivity.this, OtherActivity.class); CurrentActivity.this.startActivity(intent);