Android in the non-Activity, the intent page jump problem

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Under Activity, we know that the page jumps as follows:

Intent intent = new Intent();
intent.setClass(Current Activity.this, Jump to Activity.class);
startActivity(intent);
In non-Activity, such as custom adapter. We need to define a running context to start the page Jump:

private Context context; //Run context
Intent intent = new Intent();
intent.setClass(context, Jump to Activity.class);
context.startActivity(intent);