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POStartActivity from different context
 

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  1. POStartActivity from different context
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    <p>I've got a main class and a separete class (OnClickBtn.java) in which I want to keep just the button methos. I would like to start new activities not from the main class but from the OnClickBtn.java.</p> <p>I've run the program but it crashes at launch. I guess that my main issue is related to the code for the Intent object "Intent int_btnOpenA =new Intent(objContex, ActivityA.class)"</p> <p>This is my code, MainActivity.java:</p> <pre><code> package com.example.and2dtest; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { //START***VIEW LIST E BOTTONI TextView txtView01; Button btnOpenA; Button btnOpenB; EditText editText1; OnClickBtn btnMethods=new OnClickBtn(this); //END***VIEW LIST E BOTTONI @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Start***set buttons views txtView01=(TextView)findViewById(R.id.txtView01); btnOpenA=(Button)findViewById(R.id.btnOpenA); btnOpenB=(Button)findViewById(R.id.btnOpenB); editText1=(EditText)findViewById(R.id.editText1); btnOpenA.setOnClickListener(btnMethods); btnOpenB.setOnClickListener(btnMethods); //end***set buttons views } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } </code></pre> <p>this is the OnClickBtn.java class:</p> <pre><code>package com.example.and2dtest; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; public class OnClickBtn extends Activity implements OnClickListener { MainActivity objContex; public OnClickBtn(MainActivity cont){ objContex=cont; } Intent int_btnOpenA =new Intent(objContex, ActivityA.class); //&lt;&lt;THIS CAUSES CRASH! @Override public void onClick(View v) { switch(v.getId()){ case R.id.btnOpenA: Log.d("ZR", "in case btnOpenA"); //this.startActivity(int_btnOpenA); //&lt;-clearly This Wont Start break; case R.id.btnOpenB: Log.d("ZR","in case btnOpenB"); //do something break; } } } </code></pre> <p>how can I make it work, keeping the startActivity method not in the main activity?</p> <p>Thanks, Luther</p> <p>Ok I've been messing with the code and the following seems to work, ActivityA gets started not from MainActivity.java but from OnClickBtn.java, as I was trying to do. This is the code:</p> <p>MainActivity.java:</p> <pre><code>package com.example.and2dtest; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; public class MainActivity extends Activity { //START***VIEW LIST E BOTTONI TextView txtView01; Button btnOpenA; Button btnOpenB; EditText editText1; //END***VIEW LIST E BOTTONI @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); OnClickBtn btnMethods=new OnClickBtn(this); //Start***set buttons views txtView01=(TextView)findViewById(R.id.txtView01); btnOpenA=(Button)findViewById(R.id.btnOpenA); btnOpenB=(Button)findViewById(R.id.btnOpenB); editText1=(EditText)findViewById(R.id.editText1); btnOpenA.setOnClickListener(btnMethods); btnOpenB.setOnClickListener(btnMethods); //end***set buttons views } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } } </code></pre> <p>OnClickBtn.java:</p> <pre><code>package com.example.and2dtest; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; public class OnClickBtn implements OnClickListener { Context objContext; public OnClickBtn(Context con){ //v=view; objContext=con; } //Intent int_btnOpenA =new Intent(objContext, ActivityA.class); @Override public void onClick(View v) { switch(v.getId()){ case R.id.btnOpenA: Log.d("ZR", "in case btnOpenA"); Intent int_btnOpenA =new Intent(objContext, ActivityA.class); objContext.startActivity(int_btnOpenA); break; case R.id.btnOpenB: Log.d("ZR","in case btnOpenB"); //do something break; } } } </code></pre> <p>ActivityA.java:</p> <pre><code>package com.example.and2dtest; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class ActivityA extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_activity); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity, menu); return true; } } </code></pre>
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    1. COWhat is the reason for this? Do you want to reuse them or you just want to keep your other `Activity` "cleaner"?
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    2. COjust keep it cleaner, but most of all, at this point understand why it's not possible
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    3. COSee my answer. Hopefully it will clear it up for you.
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