Intent intent = new Intent(MainActivity.this,HomeActivity.class);
    startActivity(intent);

    Intent intent = new Intent();
    intent.setClass(MainActivity.this,HomeActivity.class);
    startActivity(intent);

    Intent intent = new Intent();
    ComponentName componentName = new ComponentName(MainActivity.this,HomeActivity.class);
    intent.setComponent(componentName);
    startActivity(intent);


	startActivity(new Intent(MainActivity.this,HomeActivity.class));
		
		
		

		
		Button button = (Button) findViewById(R.id.writeButton);

        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                setContentView(R.layout.activity_write);
                Intent intent = new Intent(MainActivity.this,WriteActivity.class);
                startActivity(intent);
            }
        });