
从APP A 中打开B APP ,注意 B APP的包名和MainActivity的全类名
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
ComponentName cn = new ComponentName("com.xpf.keyboardtest", "com.xpf.keyboardtest.MainActivity");
intent.setComponent(cn);
startActivity(intent);