1.例如下面的代码片段，Toast类的第一个参数接受一个Context对象：

@Override protected Dialog onCreateDialog(int id) { switch (id) { case 0: Builder builder = new AlertDialog.Builder(this); builder.setIcon(R.drawable.ic_launcher); builder.setTitle("This is a dialog with some simple text..."); builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Toast.makeText(getBaseContext(), "OK clicked!", Toast.LENGTH_SHORT).show(); } }); builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Toast.makeText(getBaseContext(), "Cancel clicked!", Toast.LENGTH_SHORT).show(); } }); builder.setMultiChoiceItems(items, itemsChecked, new DialogInterface.OnMultiChoiceClickListener() { public void onClick(DialogInterface dialog, int which, boolean isChecked) { Toast.makeText( getBaseContext(), items[which] + (isChecked " : " unchecked!"), Toast.LENGTH_SHORT).show(); } }); return builder.create(); } return null; } @Override protected Dialog onCreateDialog(int id) { switch (id) { case 0: Builder builder = new AlertDialog.Builder(this); builder.setIcon(R.drawable.ic_launcher); builder.setTitle("This is a dialog with some simple text..."); builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Toast.makeText(getBaseContext(), "OK clicked!", Toast.LENGTH_SHORT).show(); } }); builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { Toast.makeText(getBaseContext(), "Cancel clicked!", Toast.LENGTH_SHORT).show(); } }); builder.setMultiChoiceItems(items, itemsChecked, new DialogInterface.OnMultiChoiceClickListener() { public void onClick(DialogInterface dialog, int which, boolean isChecked) { Toast.makeText( getBaseContext(), items[which] + (isChecked " : " unchecked!"), Toast.LENGTH_SHORT).show(); } }); return builder.create(); } return null; }

然而，Toast类并没有直接用在Activity中，它被用在了AlertDialog类中。所以，这里需要通过getBaseContext()方法获取一个Context类的实例。

2.在Activity中动态地创建一个视图的时候也会遇见Context。

例如，如果想通过硬编码动态地创建一个TextView：

TextView tv = new TextView(this); TextView tv = new TextView(this);

TextView的构造器接受一个Context对象，因为Activity类是Context类的子类，所以可以用this关键字来代替这个Conext对象。

提示：

使用this动态地创建视图，例如TextView、Button，存在一个潜在的风险——内存泄漏。所以，尽可能地使用getApplicationContext()方法替代this。